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Optimal Fusion | Performance Driven Integrated Media
Estimated Price $0

Domain age of Optimalfusion.com is 12 years. Estimated potential revenue of this site may be up to $0 per month. We did not find any sites that have the same ID at Analytics and/or Adsence. According to our information, it is safe to visit Optimalfusion.com.

Monthly Visitors

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Jun'17 0
May'17 0
Apr'17 0
Mar'17 (est) 11K
Feb'17 (est) 12K
Jan'17 (est) 12K
Dec'16 (est) 13K
Nov'16 (est) 18K
Oct'16 (est) 13K
Sep'16 0
Aug'16 (est) 11K
Jul'16 (est) 22K
Jun'16 (est) 11K
May'16 (est) 14K
Apr'16 (est) 18K
Mar'16 (est) 34K

SiteGur Score

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Jun'17 0
May'17 0
Apr'17 0
Mar'17 -1362
Feb'17 -8
Jan'17 76
Dec'16 -3196
Nov'16 1354
Oct'16 -1100
Sep'16 0
Aug'16 -8288
Jul'16 5675
Jun'16 -1927
May'16 -1127
Apr'16 -6405
Mar'16 1579

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Reading Rockets
Monthly Visitors 360K
Global Rank 27928
Estimated Price $62,352

Domain age of is 17 years. Traffic is around 406K visitors during previous month, which corresponds to 27928 place in the global site ranking. During this month, traffic to site has decreased by 11% compared to previous month, and equals to 360K visitors. Estimated potential revenue of this site may be up to $1,732 per month. We found 2 sites that have the same ID at Analytics and/or Adsence. According to our information, it is safe to visit

Monthly Visitors

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Jun'17 (est) 360K
May'17 (est) 406K
Apr'17 (est) 465K
Mar'17 (est) 544K
Feb'17 (est) 709K
Jan'17 (est) 581K
Dec'16 (est) 478K
Nov'16 (est) 570K
Oct'16 (est) 462K
Sep'16 (est) 443K
Aug'16 (est) 284K
Jul'16 (est) 307K
Jun'16 (est) 342K
May'16 (est) 345K
Apr'16 (est) 352K
Mar'16 (est) 293K

SiteGur Score

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Jun'17 -1119
May'17 -1478
Apr'17 -980
Mar'17 -1734
Feb'17 1324
Jan'17 3327
Dec'16 -2312
Nov'16 1845
Oct'16 1038
Sep'16 4191
Aug'16 -272
Jul'16 -852
Jun'16 11
May'16 -587
Apr'16 2474
Mar'16 -1536

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Estimated Cost and Revenue value: $62,352

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Monthly Ads revenue: $1,732

Yearily Ads revenue: $20,784

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Other information creation: 12 March 2000 expired: 12 March 2018
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Luxury Hotels and Resorts | Official Site Shangri-La Hotels and Resorts Luxury hotels and resorts spanning key locations around the world. Shangri-La Hotels and Resorts offer exuberant service, a range of amenities, and stylish interiors which present an unforgettable experience.
Monthly Visitors 392K
Global Rank 25710
Estimated Price $67,752

Domain age of is 22 years. Traffic is around 385K visitors during previous month, which corresponds to 25710 place in the global site ranking. During this month, traffic to site has increased by 1% compared to previous month, and equals to 392K visitors. Estimated potential revenue of this site may be up to $1,882 per month. We found 1 sites that have the same ID at Analytics and/or Adsence. According to our information, it is safe to visit

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May'17 (est) 385K
Apr'17 (est) 376K
Mar'17 (est) 352K
Feb'17 (est) 320K
Jan'17 (est) 402K
Dec'16 (est) 402K
Nov'16 (est) 421K
Oct'16 (est) 483K
Sep'16 (est) 525K
Aug'16 (est) 559K
Jul'16 (est) 569K
Jun'16 (est) 530K
May'16 (est) 501K
Apr'16 (est) 543K
Mar'16 (est) 663K

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Jun'17 199
May'17 251
Apr'17 847
Mar'17 877
Feb'17 -1367
Jan'17 -194
Dec'16 -68
Nov'16 -1302
Oct'16 -895
Sep'16 -392
Aug'16 -665
Jul'16 687
Jun'16 988
May'16 -521
Apr'16 -2062
Mar'16 488

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Page Options

Getting Involved

Join Skate Canada

Become part of the skating family and become a member of Skate Canada. When you sign up for a skating program at a Skate Canada member club you automatically become a member of the national organization. If you are thinking about taking skating lessons for the first time or you want to introduce your children to a healthy life-long sport use our club finder to locate the Skate Canada member skating club nearest you.

Does your club want to become a part of Skate Canada? Click here to request a Membership Kit.

Skate Canada - Saskatchewan is a very successful provincial organization and one of the reasons for this is the involvement of hundreds of volunteers that help to keep things running. Some individuals have been volunteering for more than 50 years! There are many types of volunteer positions available and these can range from playing music at a club skating session to making policy at the provincial board level. Each year Skate Canada - Saskatchewan pays tribute to its volunteers at its annual meeting and awards are presented to those whose contributions have been recognized by their peers.

To become a volunteer at a skating club contact the club president of the Skate Canada member club nearest you, if you are not sure of the location please go to our club finder. If you are interested in volunteering at a provincial skating event in your area, please contact the Section Office.

Coaches are invaluable in the development of an athlete's skill. They are teachers and mentors for the thousands of young athletes they deal with in their day-to-day work. They work not only with athletes but also the athlete's parents in setting realistic goals and the training required to reach their potential and their goals. All coaches must go through the National Coaching Certification Program (NCCP), which is moving towards a competency-based where coaches are:

Trained in NCCP outcomes relevant to the skaters that they are coaching

Evaluated by demonstrating coaching outcomes to a specified standard.

Currently, all coaches who work at Skate Canada member clubs must meet the minimum criteria as outlined in Rule 2402 of the Skate Canada Rule Book and other provisions from time to time by the Skate Canada Board of Directors, and be a member of Skate Canada.

It takes a special person to become a coach; if you think it is a career you would like to pursue then read on for more details on how to become a coach.

Officials play a very important part in our sport. As volunteers, they donate their time, knowledge and expertise to assist in the development of our athletes and are valued members of the Association. There are different types of officials which fall into three main categories: evaluators/judges, technical panel, referees and data specialists. Judges are perhaps the best known officials and they are usually former skaters who have had a positive experience in the sport and wish to help others attain their goals.

Officials, outside the arena, are doctors and lawyers, school teachers and librarians, domestic engineers, business administrators, police officers, paramedics, financial analysts, university students, professors, marathon runners, writers and so on. You will find more information on the types of officials and how to become involved in this section.

If you decide you want to become a Skate Canada official, you will have to meet certain criteria and complete certain tasks and activities to become qualified. These activities include participating in clinics and seminars, skill tests, trial officiating (where you will receive written assessments from qualified officials) and actual officiating. To move up through the system, an official must follow the rules which have been established for promotion. This is to ensure that every judge who officiates at Canadian competitions is both qualified and competent.

The training that the Skate Canada provides to its officials is held in high regard by other figure skating federations around the world and Canadian officials are widely considered as the best trained in the business!

If you are interested in becoming a Skate Canada official, please contact Skate Canada – Saskatchewan.


text:
Hi I'm Rid and hi. I do random vlogs, do check them out.

Gladys Jane Ruzanna Sutrie bernard FFB Tara Shu ying AMELINE

Layout credits
Codes by 16thday!
Background from here, profile icon from thefadingnight.
Monday, December 24, 2007 1:43 PM
skittlesCARAMEL×'s with the post .
Random Faqs :D
>why name Yourself skittles?
well..Our intention's not to Advertise Skittles or anything.
it's just a Guild..me and baby got bored one day..so we decided to create it.

>How Did You Get the Name "skittles" anyway?
oh..before we came up with skittles,we were thinking of some other kind of name
then I realised That I was Eating Skittles..then I suggested skittles to baby and we both kinda agreed,thus skittles's Born i guess.

>why add some kinda name or something behind "skittles"
Hmm..i Guess it's to help Identify,so yeah.
okay..Can You tell me why the hell is Yours named Caramel,LOL?
lol,Guess it sounds kinda nice.

well..guess that's some common questions You guys might ask yourself
If u have any Enquiries or anything regarding joining this guild..
feel free to ask me or baby@the tagboard (:
There's nothing to be shy about

we're here to make friends and socialize anyway.
& last but not least,Merry christmas all (:
×was here


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Enrolling a Student

 School Enrollment packets are available at any of our schools, the administrative offices or you can download the forms to complete at home by clicking the link below.
***Please note that the Residency Affidavit included in the packet must be notarized.

enrollment_pencil0.jpgClick in icon for the packet

Once you have completed the various forms included in the Student Enrollment Packet, you will need to:
A. submit to the school of enrollment if starting now

B. submit to administration if enrolling for upcoming school year

The following items must be submitted with every enrollment:
1. Child's birth certificate. No copies please.
2. Proof of residency evidence

current mortgage payment, lease agreement, rental payment or tax bill for residence
utility such as cable, gas or electric
3. A certified copy of current immunizations, dates must include day, month, year of each dose administered and must be signed by a physician or his/her designee. You will not be able to register your child if you do not bring their up-to-date immunization records with you. The school nurse will inform you about boosters that are needed.

 If there are custody/guardian issues, please bring the appropriate paperwork.


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At Life Blog WordPress Theme

Template name： At Life
Description： At Life Free Blog Theme Creative elegant design that’s designed for mini bloggers who like to blog about the usual internet activity and share the tips and news with their readers. Tech the main element in this template with the old fusion laptop that’s used as logo for the template with dark sidebars and rss icons that’s looks very awesome.

下載:  Download  (密碼:  見壓縮檔註解)

By dowloading you accept our Terms & Disclaimer.

WordPress Theme Instructions:
  1. Download the Theme zip file to your local machine.
  2. In cPanel File Manager, navigate to your Themes folder. If you have WordPress installed in it's own folder called WordPress , you would navigate to "public_html/wordpress/wp-content/themes" and if WordPress is installed in your web-root folder you would navigate to "public_html/wp-content/themes".
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Tag: intelligent item

  • Deiodus

    h2. Description Deiodus is a rusty staff, parts of him made of bloodstone, the other parts made of rusted steel. where an orb would rest lies a glass eye socket that appears to have wires sticking out of the back. legends of old spoke of men made of …


text:
Stories I Reviewed

I sometimes review books, but I don't always post them on my blog for whatever reason.  However, you can find a full copy of them on Goodreads under my name. The ones that I do post on this blog will appear below.  The reason that I don't always post book reviews on my blog is because I'm not a book blogger.  However, I do enjoy reading.  I'm also very honest in my reviews.

"A Dance With Dragons" by author George R.R. Martin

"A Dead God's Wrath" by author Rusty Webb

"American Gods" by author Neil Gaiman

"CassaStar" by author Alex J. Cavanaugh

"City of Light and Stone" by Laura Diamond

"Distraction" by J.L. Campbell

"Eclipse" by author Briane Pagel

"Mermaid" by author Kate O'Connor

"Nightfire" by author Alyson Burdette

"Practice Cake" by author Dalya Moon

"Provex City" by author Michael Pierce

"Ready Player One" by author Ernest Cline

"The After" by author Briane Pagel

"The Big Smoke" by author Cally Jackson

"The Compass Master" by author Helena Soister

"The Crystal Bridge" by author Charles M. Pulsipher

"The Curse of Gremdon" by author Ciara Knight

"The House on the Corner" by author Andrew Leon

"The Sholes Key" by Clarissa Draper

"The Waiting Booth" by author Brinda Berry

"TransShifter" by author Cindy Borgne

"Vallar" by author Cindy Borgne (Vallar has been renamed "Seer of Mars")

"Visionary of Peace" by author Cindy Borgne

"Where You Belong" by author Patrick Dilloway

"Witch Song" by author Amber Argyle

"Woven" by David Powers King and Michael Jensen

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text:
Pavel KoudelkaPavel Koudelka – Koudyš

..činelisty career started during high school in Bruntálská young brass band in 1980. At the same time drummer for the rock band Reflex, which were drawn from his peers. With the arrival in the city, a period of higher bands Zebra and Jiri Armiger. Soon after, in 1984 Peter put together with your and became a founding member of the hill and then Ošklid, which were very well-known band called. Brno independent scene. After the disintegration of the group continued with Peter in your project A beat-, which were taken over by hundreds of golden hits bigbeatových 60. to 80. years in his own distinctive arrangements. They played all over the country. In parallel with this project played in a punk band last number of former members of the hill in a rock band ugly girl. In 1994 joined the Group Danube. There already uses a very raw sound strongly reduced sets, composed of a large drum, snare, hihat and cymbal strange křaplavého. Overall, this kit is using its efficient and very aggressive game gets to the very essence of rhythm without unnecessary transitions and rozdrobenin. While listening to the listener finds, that there are no missing him more drums, everything is already included in music! Danube gaining very sharp sound, going out to the bone. Danube successful concerts in Europe and in the Czech Republic. Also filming with Paul Fajt and Iva Bittová dunajovskou board you have to Release, where are the songs from the first album Danube plus a few new songs. During this period also gives together with Prague's Charles drought in the band Krutnava, in which she sang tragically deceased singer Paul Kapitánová. Together they recorded one CD. After the collapse of the Danube becomes a founding member of the band with the former guitarist BOO Danube Pepa Ostřanský and at the same time a pleasure to enjoy a pleasant party of John Bonham drums in the band Led Zeppelin revival.

This year Pavel Koudelka finished his fifteen years of work in the band of Dead.


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Sensory and Motor Mechanisms

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Presentation on theme: "Sensory and Motor Mechanisms"— Presentation transcript:

1 Sensory and Motor Mechanisms
Samaneh Bolourchi, Jennifer Tszeng & Athena Zeng

2 Introduction: Sensory Pathways
Sensory receptors transduce stimulus energy & transmit signals to CNS (central nervous system) Reception: detection via exteroreceptors or interoreceptors Transduction: stimulus energy converted into ∆ in membrane potential of sensory receptor (receptor potential) Amplification: stimulus energy strengthens in cells in pathways Adaptation: decrease in responsiveness Transmission: action potentials transmitted to the CNS Perception: constructions formed in brain (ie color, smell, sounds)

3 Introduction: Types of Receptors
Sensory receptors are specialized neurons or epithelial cells that exist singly or in groups with other cell types in sensory organs, such as eyes or ears. Mechanoreceptors sense physical deformation cause by forms of mechanical energy such as pressure, touch, etc. Chemoreceptors respond to chemical stimuli. Electromagnetic receptors respond to various forms of electromagnetic energy such as visible light, electricity, and magnetism. Thermoreceptors respond to heat or cold and help regulate body temperature by signaling surface and body core temperature. Pain receptors, or nociceptors, are a class of naked dendrites in the epidermis.

4 Mechanoreceptors Detect mechanical energy
typically consist of ion channels linked to external cell structures (ie hairs) & internal structures (ie cytoskeleton) Bending/stretching plasma membrane changes permeability to sodium & potassium ions Type of mechanoreceptor varies greatly between organisms Crustaceans - vertebrate stretch receptors Mammals - dendrites of sensory neurons

5 Introduction: Sound & Balance
Ear receives vibrations of moving air and converts into what the mind perceives as sound Also detects body movement, position & balance Structures vary between organisms Terrestrial vertebrates: inner ear is main organ of hearing & equilibrium Fish/Amphibians: lack certain parts but also contain homologous structures Invertebrates - statocysts

6 Sound in Humans: Structure of Human Ear
Outer ear Pinna Tympanic membrane Middle ear Malleus, incus, stapes Oval window Eustachian tube Inner ear Fluid-filled chambers ie semicircular canals & cochlea

7 Sensory Reception: Hair Cells
Rod-shaped hairs in corti Vibration of basilar membrane bends hairs against surrounding fluid & tectorial membrane Bundle direction affects reception Activates mechanoreceptors 1093; base explanation on 1094; use 1094 diagram

8 Balance in Humans: Utricle & Saccule

9 Sound & Balance: Variation in Organisms
Terrestrial vertebrates: ear has = main organ of hearing & equilibrium Fish/Amphibians - similar to mammalian ears; lack several structures Frogs/toads - single middle bone (stapes) Frogs: small side pocket in saccule - basis for evolution of mammalian cochlea Birds - cochlea; single middle bone (stapes)

10 Sound & Balance: Fish/Amphibians
lateral line system have ears outside of body; no eardrum or cochlea; air-filled swim bladder also vibrates in response to sound

11 Sound & Balance in Invertebrates

12 Thermoreceptors Detect heat Located in skin and anterior hypothalamus
Mammals contain a range of thermoreceptor types for particular temperature ranges Receptor proteins open a calcium channel upon binding certain products At least five different types of thermoreceptors belong to the transient receptor potential (TRP) family of channel proteins

13 Pain Receptors Nociceptors detect noxious conditions
Essential - stimulus prompts defensive reaction Animals also produce chemicals to enhance pain perception

14 Touch Receptors usually on skin
Humans contain naked dendrites to detect noxious thermal, mechanical & chemical stimuli Epidermis, dermis, hypodermis * structure of connective tissue & location of receptors dramatically affect the type of mechanical energy that best stimulates them

15 Human Integumentary System
Heat Light touch Pain Cold Hair Nerve Connective tissue Hair movement Strong pressure Dermis Epidermis

16 Chemoreceptors The most sensitive chemoreceptors
are on sensory hairs of the male silkworm which detect sex pheromones. 0.1 mm

17 Gustation In mammals, taste receptors are located in taste buds, most of which are on the surface of the tongue Each taste receptor responds to a wide array of chemicals, but is most responsive to a particular type of substance. It is the pattern of taste receptor response that determines perceived flavor. Transduction in taste receptors occurs by several mechanisms.

19 Olfaction In mammals, olfactory receptors line the upper portion of the nasal cavity. The receptive ends of the cells contain cilia that extend into the layer of mucus coating the nasal cavity. Each olfactory receptor cell expresses only one or a few odorant receptor genes.

21 Electromagnetic Receptors
Respond to various forms of electromagnetic energy such as visible light, electricity, and magnetism. Photoreceptors detect energy in form of light Examples: Snakes—body heat of prey. Fish—electric currents—prey. Animals—earths magnetic field. (birds)

22 Types of Eyes the simplest is the eye cup of planarians
In invertebrates, there are compound eyes and single-lens eyes: Compound: in crustaceans , insects, etc. (have several thousand facets called ommatidia) Single-lens: jellies, spiders, etc (single lens that focuses light) In vertebrates Evolved independently and differ from the single-lens eyes of invertebrates

23 Eye Structure

24 Sensory Transduction The human retina contains two types of photoreceptors Rods are sensitive to light but do not distinguish colors Cones distinguish colors but are not as sensitive Each rod or cone in the vertebrate retina contains visual pigments consisting of light-absorbing molecules called retinal bonded to membrane proteins called opsin Rhodopsin (retinal + opsin) is the visual pigment of rods. Absorption of light by retinal triggers a signal transduction pathway!

25 Signal Transduction cont.
EXTRACELLULAR FLUID Membrane potential (mV) – 40 – 70 Dark Light – Hyper- polarization Time Na+ cGMP CYTOSOL GMP Plasma membrane INSIDE OF DISK PDE Active rhodopsin Light Inactive rhodopsin Transducin Disk membrane 2 Active rhodopsin in turn activates a G protein called transducin. 3 Transducin activates the enzyme phos-phodiesterae(PDE). 4 Activated PDE detaches cyclic guanosine monophosphate (cGMP) from Na+ channels in the plasma membrane by hydrolyzing cGMP to GMP. 5 The Na+ channels close when cGMP detaches. The membrane’s permeability to Na+ decreases, and the rod hyperpolarizes. 1 Light isomerizes retinal, which activates rhodopsin.

26 Signal Transduction (cont.)
Three other types of neurons contribute to information processing in the retina Ganglion cells, horizontal cells, and amacrine cells Signals from rods and cones travel from bipolar cells to ganglion cells, which then transmit info to brain by optic nerve (axon of ganglion) Horizontal cells and amacrine cells function in neural pathways that integrate visual info before sent to brain. Lateral inhibition causes a greater contrast b/n light and dark (as the horizontal cells inhibit more distant photoreceptors) and this enhances the image, and sharpens its edges.

27 Synaptic activity of rod cells in light and dark
Dark Responses Rhodopsin inactive Na+ channels open Rod depolarized Glutamate released Bipolar cell either depolarized or hyperpolarized, depending on glutamate receptors Light Responses Rhodopsin active Na+ channels closed Rod hyperpolarized No glutamate hyperpolarized or depolarized, depending on glutamate receptors

28 Evolution of Visual Perception
All photoreceptors contain similar pigment molecules that absorb light (despite diversity) Genetic underpinnings of all photoreceptors evolved in the earliest bilateral animals.

29 Vertebrate Skeletal Muscle
Myofibrils consist of: Thin filaments: two strands of actin and two strands of a regulatory protein Thick filaments: staggered arrays of myosin molecules Striated Muscle: regular arrangement of filaments create light/dark band pattern Sarcomere: basic contractile unit between Z- lines

32 Types of Muscle Skeletal Muscle Voluntary movements Attatched to bones
Cardiac muscle is similar to skeletal muscle with striations. Smooth muscle lacks striations lines walls of blood vessels and digestive system organs.

33 Skeletal Systems Support, protection, and movement
Hydrostatic Skeleton – consists of fluid held under pressure in a closed body compartment. Form and movement are controlled by changing the shape of this compartment. Examples: Flatworms, Nematodes, Annelids, Jellyfish Exoskeleton – encasement deposited on the surface of an animal. -> chitinous or made from calcium salts, etc. Examples: Insects, Crustaceans, Mollusks Endoskeleton – Interior skeleton within muscles and skin. Act as levers when the muscles contract to allow the organism to move. Examples: Mammals, Birds, Reptiles, Fish, Sponges

34 Locomotion Requires energy to overcome friction & gravity
Swim: friction is major issue; gravity is minor Land: requires self-support & movement against gravity Flight: requires wings developed enough to lift & overcome gravity

35 Diseases: Color Blindness
Color-Blindness: due to alterations in the genes for one or more photopsin proteins. There are different types: No color vision deficiencies. with protanopia. with deuteranopia. with tritanopia.

36 Diseases (Cont.) \ALS, amyotrophic lateral sclerosis, or Lou Gehrig’s
Myasthenia gravis

37 Bibliography Pictures:
Information: "color blindness." Encyclopedia Britannica Encyclopedia Britannica Online. 09 Apr <>. A. Campbell, Neil, and Jane B. Reece. Biology. San Francisco: Pearson Education, Inc., 05 Jan. 2009 "mechanoreceptor." Encyclopedia Britannica Encyclopedia Britannica Online. 09 Apr <>. "inner ear." Encyclopedia Britannica Encyclopedia Britannica Online. 09 Apr <>. Helfman G., Collette B., & Facey D.: The Diversity of Fishes, Blackwell Publishing, p 3, 1997, ISBN Bejan, Adrian; Marden, James H. (2006), "Constructing Animal Locomotion from New Thermodynamics Theory", American Scientist 94 (4): 342–349

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1 A Tutorial on Parallel and Distributed Model Checking Orna Grumberg Computer Science Department Technion, Israel.

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Presentation on theme: "1 A Tutorial on Parallel and Distributed Model Checking Orna Grumberg Computer Science Department Technion, Israel."— Presentation transcript:

1 1 A Tutorial on Parallel and Distributed Model Checking Orna Grumberg Computer Science Department Technion, Israel

2 2 Aspects of parallelism Why to parallelize – gain memory or time –For model checking: usually memory Special purpose hardware or network of workstations –Networks of workstations Distributed or shared memory –Distributed memory with message passing

3 3 Parallel and distributed algorithms were developed for Explicit state methods - reachability and model construction - LTL model checking - model checking for alternation-free  -calculus BDD-based methods - reachability and generation of counter example - model checking for full  -calculus Operations on BDDs SAT solvers Timed and probabilistic model checking

4 4 Elements of distributed algorithms Partitioning the work among the processes Dynamic or static load balance to maintain balanced use of memory Maintaining a good proportion between computation at each process and communication Distributed or centralized termination detection

5 5 Reachability analysis (BDD- based)

6 6 References “A scalable parallel algorithm for reachability analysis of very large circuits”, Heyman, Geist, Grumberg, Schuster, (CAV’00) Also: Cabodi, Camurati, and Quer, 1999 Narayan, Jain, Isles, Brayton, and Sangiovanni- Vincentalli, 1997

7 7 Reachability analysis Goal: Given a system (program or circuit) to compute the set of reachable states from the set of initial states Commonly done by Depth First Search (DFS) or Breadth First search (BFS)

8 8 Symbolic (BDD-based) model checking BDD – a data structure for representing Boolean functions that is often concise in space BDDs are particularly suitable for representing and manipulating sets Symbolic model checking algorithms –hold the transition relation and the computed sets of states as BDDs –Apply set operations in order to compute the model checking steps

9 9 Sequential reachability by BFS Reachable = new = InitialStates While (new   ) { next = successors(new) new = next \ reachable reachable = reachable  new }

10 10 The distributed algorithm The state space is partitioned into slices Each slice is owned by one process Each process runs BFS on its slice When non-owned states are discovered they are sent to the process that owns them Goal: reducing space requirements (and possibly time)

11 11 The distributed algorithm (cont.) The initial sequential stage BFS is performed by a single process until some threshold is reached The state space is sliced into k slices. Each slice is represented by a window function. Each process is informed of: - The set of window functions W 1,…,W k - Its own slice of reachable - Its own slice of new

12 12 Elements of distributed symbolic algorithm Slicing algorithm that partitions the set of states among the processes Load balance algorithm that keeps these sets similar in size during the execution Distributed termination detection Compact BDD representation that can be transferred between processes and allows different variable orders

13 13 v1v1 v3v3 v2v2 0 01 1 v3v3 v2v2 v1v1 0 0 v1v1 v3v3 v2v2 1 1 v2v2 f f  v1 f v1 that causes BDD to be a compact representation When slicing a BDD we loose the sharing Slicing:

14 14 Slicing (cont.) We choose a variable v and partition a Boolean function f to f v=1 and f v=0. The chosen v has minimal cost that guarantees: –The size of each slice is below a threshold. I.e., the partition is not trivial (no | f 1 |  | f 2 |  | f | or | f 2 |  0 ) –The duplication is kept as small as possible An adaptive cost function is used to keep the duplication as small as possible

15 15 Load Balance The initial slicing distributes the memory requirements equally among the processes. As more states are discovered, the memory requirements might become unbalanced. Therefore, at the end of each step in the computation of the reachable states a load balance procedure is applied.

16 16 Load Balance (Cont.) Process i with a small slice sends its slice to process j with a large slice. Process j applies the slicing procedure for k=2 and obtains two new balanced slices. Process j sends process i its new slice and informs all other processes of the change in windows.

17 17 The parallel stage requires a coordinator for: Pairing processes for exchanging non- owned states Processes notify the coordinator of the processes they want to communicate with. The coordinator pairs processes that need to communicate. Several pairs are allowed to communicate in parallel.

18 18 Important: Data is transferred directly between the processes and not via the coordinator

19 19 Coordinator can also be used for: Pairing processes for load balancing Distributed termination detection

20 20 Experimental results On 32 non-dedicated machines, running IBM RuleBase model checker: On examples for which reachability terminates with one process, adding more processes reduces memory (number of BDD nodes) On examples for which reachability explodes, more processes manage to compute more steps of the reachability algorithm

21 21 Communication was not a bottleneck Time requirements were better in some examples and worse in others –better – because BDDs are smaller –worse – overhead and lack of optimizations for improving time

22 22 Future work Improve slicing Exploit different orderings in different processes Adapt the algorithm to dynamic networks Adapt the algorithm for hundreds and thousands of parallel machines

23 23 Model checking safety properties Checking AGp can be performed by –Computing the set of reachable states –For each state checking whether it satisfies p If a state which satisfies  p is found, a counter example – a path leading to the error state - is produced Checking other safety properties can also be reduced to reachability

24 24 Back to reachability (explicit state)

25 25 References Explicit state reachability: “Distributed-Memory Model Checking with SPIN”, Lerda and Sisto, 1999 Also: Caselli, Conte, Marenzomi, 1995 Stern, Dill 1997 Garavel, Mateescu, Smarandache, 2001 LTL model checking: “Distributed LTL Model-Checking in SPIN”, Barnat, Brim, and Stribrna, 2001

26 26 Sequential reachability States are kept in a hash table Reachability is done using a DFS algorithm

27 27 Distributed Reachability The state space is statically partitioned When a process encounters a state that does not belong to it - the state is sent to the owner Received states are kept in a FIFO queue Verification ends when all processes are idle and all queues are empty

28 28 Choosing the partition function Must depend only on the state Should divide the state space evenly Should minimize cross-transitions First solution - partition the space of the hash function  cannot be implemented on a heterogeneous network  even distribution, but not necessarily of the reachable states  does not minimize cross transitions

29 29 A better partition function for asynchronous programs (like in SPIN) A global state s consists of the local states s i of each concurrent sub-program Choose a specific sub-program prog i Define the partition function according to the value of the local state s i of sub-program prog i Since a transition generally involves one or two sub- programs, this partition  minimizes cross-transitions  distributes the state-space evenly

30 30 LTL model checking with Büchi automata (explicit state)

31 31 LTL model checking with Büchi automata A Büchi automaton is a finite automaton on infinite words. An infinite word is accepted if the automaton, when running on this word, visits an accepting state infinitely often. Every LTL formula can be translated into a Büchi automaton that accepts exactly all infinite paths that satisfy the formula.

32 32 Checking M |=  for an LTL formula  In order to verify a property , an automaton A  is built. A  contains all behaviors that satisfy . M x A  contains all the behaviors of M that do not satisfy . M |=  iff M x A  is empty.

33 33 Checking for (non)emptiness Looking for a reachable loop that contains an accepting state Tarjan’s algorithm, O(|Q| + |T|)

34 34 Nested DFS Algorithm Two DFS searches are interleaved –The first looks for an accepting state –The second looks for a cycle back to this state When the first DFS backtracks from an accepting state it starts the second (nested) DFS

35 35 The second DFS looks for a loop back to the accepting state When the second DFS is done (without success) the first DFS resumes Each DFS goes through every reachable state only once!

36 36 Why nested-DFS won’t work in parallel Relative speed determines if a cycle is found S3S3 S4S4 S1S1 S2S2

37 37 The order matters A nested DFS should start from s iff all accepting states below s have finished their nested DFS S3S3 S1S1 S5S5 S4S4 S2S2 Process A Process B

38 38 Inefficient solution Holding for each state the list of NDFSs it participated in –Requires too much space –Allows each state to be traversed more than once for each of the two DFSs

39 39 Main characteristics of the distributed algorithm Dependency graph, containing only accepting states and border states, is used to preserve limited amount of information Each process holds its own dependency graph NDFS starts from a state only after all its successors are search by DFS and NDFS NDFS is not performed in parallel with another NDFS

40 40 Experimental results Preliminary 9 workstations interconnected by Ethernet Implemented within SPIN and compared to standard, sequential SPIN Could apply LTL model checking to larger problems

41 41 Future work Improve the partition function Increase the level of parallelism by allowing NDFSs to work in parallel under certain conditions

42 42 SAT-based model checking

43 43 State explosion problem in model checking Systems are extremely large State of the art symbolic model checking can handle medium to small size systems effectively: a few hundreds Boolean variables Other solutions for the state explosion problem are needed.

44 44 SAT-based model checking Translates the model and the specification to a propositional formula Uses efficient tools for solving the satisfiability problem Since the satisfiability problem is NP-complete, SAT solvers are based on heuristics.

45 45 SAT tools Using heuristics, SAT tools can solve very large problems fast. They can handle systems with 1000 variables that create formulas with a few thousands of variables. GRASP (Silva, Sakallah) Prover (Stalmark) Chaff (Malik)

46 46 Bounded model checking for checking AGp Unwind the model for k levels, i.e., construct all computations of length k If a state satisfying  p is encountered, then produce a counter example The method is suitable for falsification, not verification

47 47 Bounded model checking with SAT Construct a formula f M describing all possible computations of M of length k Construct a formula f  expressing  =EF  p Check if f = f M  f  is satisfiable If f is satisfiable then M |  AGp The satisfying assignment is a counterexample

48 48 Bounded model checking Can handle LTL formulas, when interpreted over finite paths. Can be used for verification by choosing k which is large enough so that every path of length k contains a cycle. –We then need to identify cycles using propositional formulas. –Using such k is often not practical due to the size of the model.

49 49 SAT Solvers Main problem: time Secondary problem: space

50 50 References “PSATO: a Distributed Propositional Prover and Its Application to Quasigroup Problems”, Zhang, Bonancina and Hsiang, 1996 “PaSAT – parallel SAT-checking with lemma exchange: implementation and applications”, Sinz, Blochinger, Kuchlin, 2001 Also: Bohm, Speckenmeyer 1994 Zhao, Malik, Moskewicz, Madigan, 2001

51 51 Propositional formula in Conjunctive Normal Form (CNF) CNF consists of a conjunction of clauses. A clause is a disjunction of literals. A literal is either a proposition or a negation of a proposition. (a  e)  (c  b)  (  c  d)  (  c)

52 52 A Simple Davis-Putnam Algorithm Function Satisfiable (set S) return boolean repeat /* unit propagation */ for each unit clause L in S do delete (L  Q) from S /* unit subsumption */ delete  L from (  L  Q) in S /* unit resolution */ od If S is empty return TRUE else if null clause in S return FALSE until no further changes result

53 53 Davis-Putnam Algorithm (Cont.) /* case splitting */ choose a literal L occurring in S if Satisfiable ( S  {L} ) return TRUE else if Satisfiable (S  {  L}) return TRUE else return FALSE end function

54 54 (a  e)  (a  e)  (c  b)  (  c  d)  (  c) Unit clause: c=0 (a  e)  (a  e)  ( b) Unit clause: b=1 (a  e)  (a  e) Selecting splitting literal: a=0 (  e)  ( e) – conflict! Create conflict clause: (c   b  a ) Backtracking and choosing a=1 Satisfying assignment: c=0, b=1, a=1

55 55 Points of wisdom Clever choice of the splitting literal. Clever back-jumping on unsuccessful assignments. Remembering unsuccessful assignments as conflict clauses or lemmas.

56 56 PSATO A distributed implementation of SAT on network of workstations. The goal is to exploit their under-used computation power, especially after hours: parallelize and cumulate the work Dynamic load balance is needed since the computing power of each workstation is not known in advance (it may be shared with other programs).

57 57 a b c 1,B 0,B1,N d 0,B1,N 0,N e a c a c d e a c d Partitioning the work

58 58 The Master-Slave Model of PSATO One master, many slaves Communication only between master and slaves Master sends jobs (S,P) to slaves S – set of clauses, P – guiding path Each slave runs Davis-Putnam according to P When a slave stops, it sends master –TRUE or FALSE, if job is finished –guiding path, if job is interrupted

59 59 Balancing the workload If a slave returns TRUE, all slaves are stopped If it returns FALSE, the slave is assigned a new path. If time expires, the master sends halt signal to stop the current run and collects new paths The new paths will be used in the next run

60 60 Achievements Accumulation of work: cumulates the results of separate runs on the same problem Scalability: more workstations result in a faster solution Fault tolerance: minimal damage by failure of one workstation or network interruption No redundant work: processes explore disjoint portions of the search space

61 61 Experimental results For random hard 3-SAT problems, the speedup on 20 machines was from 6 to 18. –Speedup is the ration between CPU time of the sequential machine and the average time over the parallel machines. For open quasigroup problems they managed to solve a problem on 20 machine in 35 “working days” that would otherwise require 240 days of continuous run on a single machine.

62 62 PaSAT Can run on multi-processor computer and on a networked standard PCs Implemented on shared memory with dynamic creation of threads

63 63 PaSAT (Cont.) Uses guiding paths as in PSATO for partitioning the work and for balancing it Holds conflict clauses learned by all tasks in a shared memory –implemented so that it allows concurrent access without synchronization Each task filters its conflict clauses and put only the “best” in the global store Periodically, each task integrates new clauses from the global store into its current set

64 64 Experimental results On a machine with 4 processors, on satisfiable SAT problems: obtained a speedup (time on sequential/time of parallel) of up to 3.99 without exchange of conflict clauses and even higher with the exchange

65 65 Future work Implement the ideas of PaSAT on distributed memory Extend the ideas for many machines working in parallel

66 66 THE END

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Category Archives: bridal

Book to Buy: Designing in Ivory and White

Photo Credit LSU Press

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Photo Credit: Brian Baiamonte

Designing in Ivory and White, available through LSU Press, chronicles Perron’s rise to become the exquisite designer she is today. The book goes into details of Perron’s methods for creating her one of a kind dresses. Including methods for creating crinolines and foundations, her techniques for draping and pattern making are on display. It is interesting to watch a sketch transform into a three-dimensional form.

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On Saturday, August 16 the School Librarian’s Workshop Facebook page achieved a major milestone. The 1,000th member joined.  Less than a year ago we had just passed the 400 mark. Knowing I am reaching so many librarians (although not all

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Brazil: Amazon Destruction 'at New Low' - BBC

Bolivia Arrests 7 in Jailed American's Case - AP

Cuba: US Rabbi Says Jailed American in Good Health - AP

Misconceptions About Mexico - CNN opinion

Asia / Pacific

The Pentagon Yawns at China's Carrier Operations - FP

Analysts: Tibet Self-Immolations Hit New Phase in China Protests - VOA

China: Tibetans Injured in Crackdown; Self-Immolations Continue - NYT

China 'Not Currency Manipulator' - BBC

US to Raise Passport Map Issue With China - Reuters

UN Committee Condemns N. Korea Over Widespread Rights Abuses - Reuters

New Satellite Images Suggest N. Korea Missile Activity - VOA

S. Korea: North Close to Rocket Launch - WP

North Korea May Be Planning Rocket Test - NYT

North Korea's Illegal Weapons Pipeline Flows On - WSJ

DMZ Xmas Display Shelved Again to Avoid N. Korea Provocation - S&S

US Military in Japan Wrestles with Curfew's Ineffectiveness - S&S

Easing Burma Sanctions Draws Interest of US Business - VOA

It Really is that Bad: A Powerful Speech on North Korea - WP opinion

In China, Elders Trump Reform - AT opinion

Debt Deal Marks 'New Day' for Greece - VOA

Greece, Markets Satisfied by EU-IMF Greek Debt Deal - Reuters

French Conservative Party Threatened with Split - WP

French Party Splits Over Leader - BBC

Sarkozy Returns to French Politics as Party Peace Broker - Reuters

Lack of Reform Progress Delays Bosnia's EU Bid - Reuters

Belgian Intelligence Workers Outed on Facebook, LinkedIn - WP

Fighter's Release Fuels Fears of Ethnic Violence in Russia - Reuters

Outrage at 'Jewish List' Call in Hungary Parliament - Reuters

Georgia’s Wrong Turn - WP editorial

South Asia

India’s Ruling Party Unveils Plan to Send Cash Directly to Poor - WP

India Journalists Deny Extortion - BBC

Bangladesh Mourns, Calls Factory Fire 'Act of Sabotage' - Reuters

Fire Highlights Harsh Lives of Bangladesh Workers - AP

India Should Look to China to Rebuild Rails - IE opinion

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It's a small world

Return of the Prince

Keep your friends close, and your enemies closer

Wakkar had certainly changed since the last time the party saw him stepping into a portal in the Elemental Chaos. However, as the tense discusssions progressed over what the relation between the orc prince and the party would be after “rescuing” him from the hands/fins of the Kuo-Toa, it became evident that their original encounter in Erkon’s desecrated tomb was a matter of business – nothing personal.

Lisanna, liaising between Wakkar and the party, found that the prince (banished from Wruk by his brother, Varis would later add) had been working at the behest of Kima, a dwarven woman who was the rumoured archictural mastermind behind the great Western airships that dominated the Sky War. Wakkar had also been acting on some information gleaned from prophecy concerning the power emanating from the Karellian Jacaranda, but who or what his source was, he would not reveal.

The tentative alliance between the party and Wakkar was seemingly cemented by some gruffly respectful words between Trix and Wakkar. Wakkar agreed to settle old differences by ordering the freedom of Makani, the elf druid, from where she was being held prisoner in Wruk. Lisanna provided the proof via a spare scrying ritual – Wakkar was true to his word.

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© victor zastol'skiy - Fotolia.com

© victor zastol’skiy – Fotolia.com

Last week, we brought you an assortment of easy tips to enhance your current weight loss program. Today we continue with seven more unique and useful tips and tricks to try out.

Remember: you’ve got nothing to lose but pounds!

Keep Things Cool

There’s nothing like a nice, warm room in the winter, but you could be hindering your weight loss goals by keeping the thermostat cranked up high. A colder room forces your body to burn calories to keep warm. You don’t have to freeze, just consider a lower base temperature.

Swap Your Drink

Most people like to have a drink now and again, but alcohol can be high in calories (and/or sugar). Next time you’re choosing your drink, reach for a glass of red wine. It’s full of antioxidants and could help you save calories on a night out. For non-alcoholic drinks, it’s best to reach for plain water or sparkling water with an added splash of either juice or fruit puree.

Avoid Processed “Health” Foods

Low-calorie foods, including those sweetened with sugar substitutes, are anything but healthy. While they may be low in fat, calories, or sugar, these foods contain dangerous chemicals that won’t help you lose weight and could even harm you. Always choose whole foods over processed options.

Meeting Up? Skip Dinner!

Getting together with a friend doesn’t have to mean a high calorie dinner on the town. Eat beforehand and try an activity-based get together instead such as hiking, running, or biking. Want to enjoy a meal around the table? Do a healthy themed potluck or cook dinner for your friends and have them bring the wine. Changes like these are easy on both your wallet and your waistline.

Slow Down

Rushing through your meals can keep your stomach from realizing when it’s full. Chew each bite thoroughly, enjoy the flavors, and take your time. Practice putting the fork down in between bites and having a sip of water after you swallow your food. You may find that you eat much less at each meal!

Do Yoga

While yoga isn’t typically a fat-burning powerhouse workout, It can help increase muscle mass and metabolism, help you sleep better, and improve your stabilizing muscles (leading to fewer injuries while you’re active). Yoga can also help reduce stress, one of the factors that influences weight gain.

Eat Earlier

Skipping the midnight snack could slim you down! Studies have shown that people who eat the majority of their daily calories in the morning and afternoon weigh less than those who keep eating into the evening.

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*Smartlipo is a trademark of Cynosure, Inc. The information on this page is not intended to be used as medical advice in any way. Always consult with your doctor for any health related concerns and before starting a new diet or exercise program.


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Home > High Cpu > Virtualbox High Cpu Usage When Idle

Virtualbox High Cpu Usage When Idle

Johny 18 January, 2013 at 10:51 pm | Permalink Dude id love you!!!! In some cases machine hang on shutdown, and was never able to boot getting stuck at the Windows logo. Many many thanks in advance. So if that interrupt level could still be decreased for Windows 2008r2 improving performance, it must be a matter of VirtualBox core. http://smartnewsolutions.com/high-cpu/oracle-virtualbox-high-cpu-usage.html

VBox.log file Change History Changed 8 years ago by Nerijus attachment VboxLog.log added comment:1 Changed 8 years ago by vbox4me2 Suggestion: assuming some interrupts are emulated, add some form of flood VBox version is 3.1.2 r56127. Jent 12 September, 2009 at 3:12 am | Permalink The problem you described here is actually due to a bug in virtual box that has to do with the CPU affinity. Changed 3 years ago by dezlov attachment VBox-4.3.6-old-high.log added VM created in the past which had high CPU usage from interrupts and still has after upgrading to VirtualBox 4.3.6 Changed 3 https://www.virtualbox.org/ticket/1884

Virtualbox High Cpu Usage Windows 7 Guest

I would really like to have an immediate solution to this problem, either in form CLI vboxmanage command (preferable), or as a new version of VirtualBox. Attachments VBox.log (34.4 KB) - added by G. Watch interrupt count to increase by 1024 per second.

It is interesting in two regards. Browse other questions tagged windows virtualbox or ask your own question. After today's discovery I cannot be certain of anything anymore. Vboxclient High Cpu I have read the reports on a number of bug reports in the database and I have tried the suggestions there but they are more aimed at Windows XP 32-bit guests.

Seorang user bernama Jent dalam sebuah website mengatakan : The problem you described here is actually due to a bug in virtual box that has to do […] laamanni 6 September, Virtualbox High Cpu Usage Guest Idle Turner 22 October, 2011 at 4:10 pm | Permalink Hi. Not the answer you're looking for? https://www.virtualbox.org/ticket/3613 Now this solution worked great - I'm able to see 0% guest utilization where as before it would never get below 36%.

What does the expression 'seven for seven thirty ' mean? Vboxheadless High Cpu Usage more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Comments are closed. ← Previous Next → Tagsandroid apps Apple Asus WL-500W blog Code google Hack iPhone Linux Microsoft Mobile Projects PS3 security ubuntu windows Windows Mobile WM6 wordpress WordPress PluginBlogrollCareerPlot Thanks.

Virtualbox High Cpu Usage Guest Idle

Well, I wouldn’t say that, but it is better. http://superuser.com/questions/809396/virtualbox-consuming-100-cpu-even-when-the-guest-is-idle The problem definitely gets worst with more virtual processors allocated to VM. Virtualbox High Cpu Usage Windows 7 Guest Utilisation of guest @100% Win2k8R2 64 as Host. Virtualbox Nested Paging How can "USB stick" online identification possibly work?

I believe it's a bug. check over here Now if we can get the Oracle people to work on the issue as this is very annoying. This was on centos 5 VirtualBox-3.1-3.1.4_57640_rhel5-1 Linux vms01.internal 2.6.18-164.2.1.el5PAE #1 SMP Wed Sep 30 13:32:13 EDT 2009 i686 i686 i386 GNU/Linux Intel(R) Xeon(R) CPU E3110 @ 3.00GHz xin44 18 February, 2010 We all tried a lot of different things with varying degrees of success. Virtualbox Svchost High Cpu

Example setup: A fresh Windows 7 SP1, with all updates applied, MySQL 5.5 Server, MS Office and few other applications installed. Thanks a lot! list of files based on permission Where is the barding trick? his comment is here comment:6 Changed 8 years ago by vbox4me2 Sounds familiar, see also:  http://www.google.nl/search?hl=nl&q=high+cpu+second+vm+site%3Aforums.virtualbox.org&meta= Its been discussed a few times, I suspect the loadbalancing system not being enabled when one VM is running.

Running Google Chrome with Guest CPU <5% = host CPU >100% (on dual core Macbook Pro). Virtualbox Cpu However, on host, CPU usage increase significantly. Hochgeladen am 19.02.2011The only way I can get the CPU to go down is by creating a dummy machine and run it while the main vm is running (even though the

Your condescending attitude is not very helpful.

Cheers, Nick comment:28 in reply to: ↑ 22 Changed 7 years ago by Burz After updating both CentOS and VB, I noticed the 85%+ CPU usage was occurring while the guest was Personally, my work around was to go all the way back to version 3.0.12. This configuration was extremely slow/sluggish. Virtualbox Enable Pae/nx Thanks, Daniel comment:18 Changed 8 years ago by lkraav the common denominator in #3613 is usage of interrupt 70h: - MS SQL server 2008 (express or not), - SQL server 2005

I am using w7x64 host vbox 4.1.0. http://ycsoftware.net/virtualbox-high-cpu-problem-illustration/ SmL9 24 May, 2011 at 8:35 pm | Permalink Wow it actually works! comment:12 in reply to: ↑ 11 Changed 8 years ago by alexk Replying to VladimirCZ: As proposed on some forums, running concurrently another virtual machine turns the behavior of machine with an http://smartnewsolutions.com/high-cpu/dwm-high-cpu-usage.html comment:21 Changed 4 years ago by sp it has nothing to do with the host drivers, the issue exists on windows 7 x64 as well comment:22 Changed 3 years ago by

comment:17 Changed 4 years ago by frank Thanks. Increasing the memory dedicated for the guest machine to 5GB solved the problem, but then I had too low remaining memory for other guests. comment:16 follow-up: ↓ 17 Changed 8 years ago by lkraav this ticket looks like duplicate of #3613 comment:17 in reply to: ↑ 16 Changed 8 years ago by danielaharon Replying to lkraav: this This isn't about what's clever or not.

This proven mechanism might hopefully lead to the final solution. Where is the barding trick? This is expected. I've also made a DOS machine which is suggested to do nothing and that reduces the CPU activity to about 56% but not as same as it should be when my

Download in other formats: Comma-delimited Text Tab-delimited Text RSS Feed Contact – Privacy policy – Terms of Use virtualbox.org End user forums for VirtualBox Advanced search Board index Change font size The VMs just seem to use all the CPU they can. Thank you very much :) Host Ubuntu 10.10 x64 Guest Windows XP VirtualBox 3.2.10 CPU Intel DualCore (HP 6530) November 16, 2010 11:55 AM Monty said: Just installed 3.2.12 and This VM often does nothing inside, but the VM process ate about 80% of a CPU core.

USB disabled. Wähle deine Sprache aus. So, klaus, your attitude isn't helping anyone. Start using any applications actively and interrupts usage jumps up to 60%.

This is the only VM running on the host at this moment. This is the configuration of my system: Pentium Dual Core T230 (1.73 + 1.73), 2gb RAM Oracle VM VirtualBox ver. 4.3.14 r95030 This is the configuration of my guest: Windows 7 Just for the sake of experiment I have converted VDI disk to VMDK, created new (similar) virtual machine in VMware Workstation, attached the disk to that machine, and voila - no Source:  http://blogs.msdn.com/psssql/archive/2008/12/16/how-it-works-sql-server-no-longer-uses-rdtsc-for-timings-in-sql-2008-and-sql-2005-service-pack-3-sp3.aspx Problem with SQL server 2008: Forum thread:  http://forums.virtualbox.org/viewtopic.php?f=2&t=15668 Same thing happens with Google Chrome.

Give it a try for yourself. user21 27 July, 2011 at 1:26 am | Permalink Hi, the high cpu usage is back in 4.1 version.


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Saturday, April 9, 2011

More early April goodness

Wild Turkey, Charles River Peninsula, Needham, MA
OK, I know that wild turkeys can fly and that they roost in trees but I have to say that seeing a bird that large that high up in a tree silhouetted against the morning sky was quite an unexpected sight.

There is no better time to see palm warblers, little yellow balls lit up by the rising sun.

Or goldfinches, though this one's brightness seems to have disabled my camera.
Lots of singing and chasing. The palm warblers were even going after the goldfinch.

Speaking of high male hormone levels, the tree swallows have discovered the nest boxes and are now competing four and five at a time for possession. And coming after me too. Others (below) are simply playing a waiting game.
The tree swallows are a wonderfully disruptive force, especially irritating to house sparrows, who are finding their claims of ownership contested.

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