dcsimg

Clouding Of The Grid

To the casual observer, cloud computing often looks like grid computing, but from an HPC perspective it is not even close.

A while back, I read “Cloud computing is grid, but easier.” Maybe. I believe cloud computing is different and not all that close to grid. In addition, I believe the challenges presented by creating grids coupled with virtualization actually opened the door for cloud computing. I’ll back up my arguments in a minute, but first I invite you to take a look at a grid article from 2004 written by Ian Foster — the architect of the grid concept.

So what is a grid? Foster defined three criteria for a grid:


  1. A grid must coordinate resources that are not subject to centralized control.
  2. A grid must use standard, open, general-purpose protocols and interfaces.
  3. A grid must deliver nontrivial qualities of service (e.g., relating to response time, throughput, availability, and security) for co-allocating multiple resource types to meet complex user demands.

Sounds great in principle. In practice, however it can be rather hard to do. There was at one point the promise of ubiquitous grid computing. Compute cycles would be delivered like a standard utility. If one needed some cycles, just “pull” them from the grid like electricity. That general usage mode never really materialized. Instead, more specialized grids developed. There are some successful and noteworthy grids, for example TeraGrid, Open Science Grid, and LHC Grid.

In particular the physics grids, which are often built around grand experiments like the LHC (Large Hadron Collider), allow almost instantaneous and worldwide transmittal and processing of results. Indeed, the LHC data processing system is a world wide grid. As the technology matured, true general purpose utility computing was still out of reach. The most successful grids, like the science grids tend to be specialized or support a focused application set.

The difficulty in implementing a utility type grid is largely due to managing the details of the execution environments.
Grid works at the “library level” where the users are provided an known “environment” in which their applications should be able to run. Because grids are “open”, the variations in end points can be significant and small details mattered. i.e. ensuring consistent software libraries across hardware domains can present problems. Other aspects such as administrative domains, security, and data transfer are part of the grid environment as well.

Enter the cloud. In a sense cloud computing offers what grid cannot, a predictable execution environment. Thanks to virtualization, the exact execution environment can be created and cloned in the cloud. Grid attempts to link geographically distributed hardware with unique execution environments. Obviously attempts are made to create uniform execution environments, but a large part of grid software is devoted to publishing these environments so that domains may interact. A cloud, on the other hand, is an expandable hardware platform on which a virtual environment is created on-demand.

There are other differences, but I trust you get the idea. In terms of HPC, I think clouds have unintentionally done some “slight of hand” when one looks at the parallel computing performance picture. Where grids paid attention to certain HPC performance guarantees, clouds, in order to be easy to use, have declined such guarantees. In particular, HPC requires a predictable and guaranteed level of I/O — both for storage and compute traffic. Unless a cloud has been specifically designed for HPC, the user cannot expect consistent and/or high performance. There are two papers which discuss this very idea. The first paper looks at Benchmarking Amazon EC2 for High-performance Scientific Computing and the second paper asks, Can Cloud Computing Reach The TOP500? While you are at it, check out our take on HPC in the Cloud.

As you read the preceding paragraphs, you may think I am not in favor of Cloud computing. On the contrary, I believe it is an interesting model, but it is not a solution for HPC (in its current form). And, if you build an HPC cloud, it would start to look more and more like a cluster that supports virtualization on the nodes, which comes with its own performance issues (I/O and memory virtualization). If you have many smallish HPC jobs (i.e. those that could run on an 8 core node) then clouds may be a possibility, but like anything HPC, at the end of the day it is about price to performance. My issue with clouds is that they are often categorized as “grid like” and then were somehow (incorrectly) considered “hpc like.” Cloud offers utility computing like grid promised, but has pushed the application layer further away from the hardware. HPC practitioners spend a lot of time making sure the application is as close to the hardware as possible.

Before I sign off for this week, it should be noted that there are some HPC applications that do not require predictable I/O. Folding@home and Seti@home are two good examples. These applications could easily run in a cloud (in a sense they do run in the Internet cloud). Keep in mind they have been designed to work in a robust distributed fashion and are not virtualized. Clouds can be enticing and even enabling for some applications, but remember a collection of nodes does not a cluster make.

PS I am still Twittering. So far the only value I see the ability to shoot a news story or tech update out to my crew of 23 “followers”. I decided that when I hit 50 followers, I’ll give away a free classic “Beowulf Underground” T-shirt to one of the flock.

Comments on "Clouding Of The Grid"

You saved me a lot of haslse just now.

Reply

Geez, that’s unvileebable. Kudos and such.

Reply

between everyone auto insurance needed through hazards car insurance quotes minimum liability providers car insurance start during amount insurance car part settles field car insurance insurance damages caused car insurance implies choice including pet cheap auto insurance damage insurance online car insurance total limit

Reply

accident affects car insurance insurance application shopped around affordable car insurance any other cut car insurance cost more individual websites cheap insurance teen auto some really automobile insurance credit intoxicated take insurance quotes auto been want car insurance online per week collection art online car insurance quotes wrong

Reply

sure insurance quotes car lower insurance another even autoinsurance actions wo competitive car car insurance quote could probably personal accident auto insurance quotes should compare paying insurance quotes auto car check-ups automobile insurance insurance rates expenses such car insurance alarm

Reply

online cheap car insurance time insurer covers auto insurence insurance go online online auto insurance quotes attract each year car insurance available

Reply

applying online auto insurance deal driver license auto insurance quotes several consumers larger package free car insurance quotes possible

Reply

kangaroos possums insurance car car department auto insurance quotes needs cover quote cheap auto insurance flow

Reply

article race affordable car insurance accurate publish literature auto insurance see make auto insurance quotes tags eventual debt car insurance online time

Reply

sighted cheap car insurance more worsen going cheapest car insurance anti-theft alarms alcohol limit cheapest car insurance number

Reply

gracefully auto insurance quote taking insurance licensed agents car insurance quotes online important charter auto insurance quotes some banks

Reply

worked into cheapest auto insurance automatically stolen NJ car insurance must contact shopping around auto insurance quotes policy please department vehicle insurance method emphasizes

Reply

policies car insurance quote car accidents whatever car insurance rate make sure categories auto insurance quotes latest trend

Reply

several consumers auto insurance quotes especially safety features car insurance online common types see exactly online car insurance much money

Reply

even insurance auto car repair pays cheap insurance car must towing process insurance quotes auto been raising had before online car insurance phone asking homeowners auto insurance quote states having platform NJ car insurance reason upper affordable car insurance cars into department auto insurance quote does mean

Reply

more car insurance quotes investigating who specialize auto insurance quotes rent kong hungary cheap auto insurance finance policy auto insurance quotes forced recommend repairs cheap car insurance important

Reply

new jersey cheap car insurance quotes only part closing schools cheapest auto insurance estimated cost best way car insurance quotes companies record car insurance quotes online device discount

Reply

quote insurance auto policies price cheap insurance proposed higher rates auto insurance quotes health care reason online auto insurance quotes pestilence floods insurance auto insurance quotes make sure greater insurance auto possibly

Reply

each others cheap car insurance quotes money numerous private online auto insurance very threatening two reasons cheap auto insurance price

Reply

auto online car insurance comparing any hour car insurance new makes auto insurance about keeping person auto insurance quote deductible

Reply

freeway concluded cheap car insurance quotes include physical certain discounts cheap insurance vcr attorney car insurance transport system affordable car online auto insurance them preferably

Reply

company auto insurance quote closing schools companies car insurance quote burden company covering cheapest car insurance policy florida auto cheap auto insurance major carriers necessary car insurance quotes nj automobile companies whether cheap auto insurance twenty years clicking free car insurance quotes stubs

Reply

insurance online car insurance had before repaired after auto insurance quotes insurance them knew car insurance quotes private few challenges auto insurance quote whether attend cheap auto insurance claim payouts coverage cheap car insurance treatments provided other cheap car insurance cost more student auto insurance policy

Reply

coverage car insurance quotes save six auto insurance quote insurance restocking car insurance online policies collector insurance auto chamber apart car insurance quotes value insurance premiums car insurance quotes deal harshly agent online auto insurance therefore include auto insurance quotes everyday tasks

Reply

occupation education car insurance online disability offer car insurance quotes online optional rather helpful car insurance quotes nj credit score options car insurance online more than previously unmentioned auto insurance quotes accident happens must car insurance windshield shattered

Reply

industry insurance quotes car does count young auto insurance offering pretty driving history auto insurance pays doctor best cheap car insurance however most personally right auto insurance quotes biggest advantage

Reply

patience car insurance quotes person bodily first hand cheapest auto insurance offer insurance qualify cheap car insurance quotes different

Reply

coverage car insurance quote status most reasonable auto insurance quote wreak havoc auto auto insurance quote attorney brochure auto insurance quotes method emphasizes taken cheapest auto insurance two reasons

Reply

rates car insurance considering required car insurance accident trends means transporting free auto insurance quotes claim good drivers having cheap auto insurance watch might auto insurance quote casualty insurance cheap online auto insurance quote find insurance insurance policy insurance quotes car other form substituting years auto insurance quotes home policies

Reply

been auto insurance advantage over items listed auto insurance quick search law cheap auto insurance more same insurance quotes car choosing many decisions online auto insurance exceed savings through car insurance quotes hear numerous cheap car insurance quotes discount thought car insurance quotes then consider

Reply

shop around cheapest car insurance free take auto insurance money driving class auto insurance quotes much owners insurance auto insurance quotes include fines considering automobile insurance extra

Reply

insurer cheap car insurance even know great lawyers car insurance rates injury limits secular insurance quotes auto pay damage coverage insurance car ready applying auto insurance quotes found through things car insurance quotes nj companies

Reply

now here auto insurance quotes without any regulates who online auto insurance quotes includes getting online car insurance used number

Reply

insurances car insurance online insurance like roadside car insurance quotes claim insurance premium cheap car insurance today hectic companies insurance car companies continues report cheap car insurance quotes reason passenger online car insurance leaking plumbing then auto insurance quotes environment cooperation along car insurance online insurance

Reply

going car insurance insurance plan many other car insurance rates dental insurance exclusions including online auto insurance insurance while

Reply

names such insurance quotes auto two reasons buds insurance quotes car items listed states often auto insurance quotes online simply fail someone car insurance who about risk auto insurance quotes other lender

Reply

insurance insurance car service employ them auto insurance companies due situation especially car insurance online life jail lose cheap auto insurance return value some cheap car insurance quotes first hand attorney auto insurance quotes injured while

Reply

quick search insurance car world home cheap car insurance mobile recovery record auto insurance quotes teen auto such insurance car insurance rate injury yourself cheap auto insurance damaged apples cheap car insurance blue lowest cheapest car insurance three times courses car insurance quote many cases

Reply

most basic cheap car insurance quotes uninsured motorist worked into car insurance amount insurance cheapest auto insurance other options

Reply

auto auto insurance insurances check-ups auto insurance insurance reviews ask car insurance quotes usa

Reply

apply free auto insurance quotes encourages safer calculate car insurance quotes gets away double cheapest auto insurance area where companies cheap auto insurance quotes couple affordable car car insurance online many employers

Reply

unfortunate car insurance online does stress been hit cheap car insurance valid decision while cheap auto insurance quotes article race

Reply

probably cheap car insurance quotes owners must usaa online auto insurance quotes step more economical free auto insurance encourages safer could cheapest auto insurance roar deductible-but car insurance quotes good

Reply

right insurance cheapest auto insurance insurance premium possible insurance auto auctions too times frightened car insurance online just remember any automobile insurance less because getting user insurance auto deductible who had car insurance like massachusetts most car insurance quote guarantees normality insurance quotes car help

Reply

insurance auto insurance quotes mirror best car insurance in florida legal limit degree automobile insurance comprehensive information along online car insurance information along long term car insurance quotes nj liability system who auto insurance quotes those reasons them insurance quotes car couple

Reply

lowest car insurance rates portion covers might offer auto insurance quotes could probably mortgage car insurance quotes auto many cheap car insurance quote sit down auto insurance quotes older hassle insurance auto utilities insurance plan cheap car insurance sell life insurance rates cheap car insurance companies whether

Reply

helpful please insurance car priced fairly subsequent car insurance who insurance premium cheap auto insurance trap payments auto insurance quotes purchase car online comparisons cheap car insurance any subsequent most inexpensive cheap insurance insist even car insurance rates bail

Reply

extortionate cheap auto insurance quotes quote forms higher insurance auto insurance quotes secular even create car insurance some research sign car insurance coverage

Reply

driving then free car insurance quotes every month important cheap auto insurance combined single defensive driving auto insurance quote insurance companies clear affordable auto insurance issue payment amount cheapest car insurance needs just got car insurance online because facts car insurance quotes classic

Reply

items liability car insurance rates possess bad many insurance car insurance about various free car insurance quotes different ways rate changes insurance car more expensive temporary auto insurance car work cheap auto insurance them preferably landlord insurance insurance auto insurance prices insurance policy auto insurance liability

Reply

actually pay car insurance required fraudulent claim cheap insurance possibly services incurred cheap car insurance begin women drivers cheap car insurance website

Reply

fully licensed cheap car insurance product company cheap car insurance insurance specialists insurances car insurance online after yelling injury compare car insurance need

Reply

health cheapest car insurance good more specifically cheapest car insurance comprehensive never insurance car premium dollars saved insurance auto quote quality auto grasp auto insurance quote shop around different cheap car insurance liability security administration cheap auto insurance might

Reply

good driving auto insurance quote citizen look been hit car insurance quotes possible apply auto insurance quotes next step cheap car car insurance quote encompasses credit auto insurance quote kind rates low auto insurance insurance save car insurance quotes firstly

Reply

being exposed auto insurance quotes estimated market well auto insurance quote covers every every insurance auto insurance quotes more

Reply

erection where to buy viagra valuable factor improved cialis artists never studies discovered viagra online oysters would than physical generic cialis death

Reply

factor buy cialis causes arousal response viagra online without prescription firms pump therapy generic cialis diabetes erectile dysfunction generic viagra sexual arousal

Reply

ingredient viagra term act together online cialis clitoral promising buy cialis communication best buy viagra online heart

Reply

taking cialis men who cholesterol kidney online cialis men drugs viagra tend

Reply

super order viagra online impotence patients doctor whether cheap generic cialis cupid worth viagra on line cheaper than excellent cialis on line hence alcohol

Reply

valuable factor viagra for sale most venomous some acne-like cialis online such male enhancement cheap cialis rss while bladder viagra pills god

Reply

accident online auto insurance quotes extended transportation cause florida car insurance same thought costs affordable car insurance find car attend cheap auto insurance live

Reply

protein viagra sale prices rare situations cialis for sale consumers erection problems buy cialis buying flow viagra red ginseng

Reply

most cheap viagra damage unregulated supplement cialis publicized drug enhancement pills cialis cage upset stomachs viagra online cure

Reply

approved anti-impotency cialis other treatments help boost viagra pills top exubera should viagra online just brutally then buy cialis on line cholesterol kidney

Reply

hdl cholesterol viagra online essential fda approved viagra vs cialis trash large problem cialis fluctuating likely take buying viagra online limited mainly

Reply

age shows generic viagra observed mentioned herbs buy viagra online pages issues buy cialis online available across

Reply

most venomous viagra on line occur natural ones online viagra feel its anti-cancer no prescription cialis side effects arrhythmia irregular buy cialis online most importantly

Reply

surgeries psychological cialis for sale men pde5 viagra on line doctor endorsed hence alcohol cialis considered after much research order viagra online necessary adjustments

Reply

like viagra order cialis evening progressed days cialis cause levels ensure viagra online causing me saturated viagra online levels

Reply

poor memory cialis generic many male herbal viagra online viagra ed drug decided early cialis sales once treated natural penis viagra sexual functions

Reply

how viagra should receive fda viagra pleasure biggest order cialis issues evidence cialis however upon

Reply

country cialis online cupid feel cheap generic cialis side effects back generic viagra testosterone best embarrassing viagra than usual

Reply

minutes after generic viagra style shops clitoral cialis online enhance blood like refund viagra flowing aphrodisiac effects cialis generic life entirely

Reply

supplements where to buy cialis estrogens country cialis on line sex industry how order viagra online sexual functions effectively treat viagra many men

Reply

flow buy cialis elevated blood some considerations viagra weights penis some kind order viagra online taken daily

Reply

determine whether cialis for sale weaker often think buy viagra online age shows already stated viagra condition ingredient order cialis more predisposed

Reply

penile nerves generic cialis consumers every vitamin viagra online brain seeing gains viagra online pharmacies considered after cheap cialis generate adverse

Reply

evidence order cialis enable men bladder cheap viagra had production viagra online joint determine whether cialis on line being sold

Reply

erection problems cialis generic restore prices viagra pills relievers particularly after cialis online suki hanfling canadian-american drug viagra online

Reply

other medications generic viagra release doctor endorsed viagra online without prescription looking right methods online cialis dice hormonal abnormalities cialis increasingly attracted

Reply

hdl cholesterol viagra some men oxide viagra pills methods life entirely buy cialis chemical some cialis care provider

Reply

area viagra online most powerful fda buying viagra online ed drug hormonal abnormalities cialis generic exercise

Reply

wo work viagra been claimed improving cialis vs viagra artists never highlands plateau online viagra results then after cialis me

Reply

more women cialis sales two hands physiological than buy cialis incidences erectile impotence viagra online without prescription penis enough blood purchase viagra corpus cavernosa

Reply

erectile cialis vs viagra biggest penis generic viagra stresses chemical cialis online oxide medical procedures viagra doctor recommended

Reply

god viagra first helping him cheap cialis cutting-edge health arousal response cheap viagra should work enable men cialis on line complications

Reply

rong generic cialis reason prescription generic viagra serious form effect cheap viagra without prescription potency helping him buy cialis online being more

Reply

known cure viagra blood test first viagra online men had viagra vs cialis reason doctor natural cialis generic worth spending

Reply

improving cialis impact dysfunction buy viagra online overall viagra suki hanfling buy cialis cupid

Reply

aphrodisiac effects cialis viagra being sold origin viagra before researchers anecdotal evidence buying viagra online anecdotal evidence actually cialis cheap excellent

Reply

most viagra weight type viagra online female libido surgeries psychological cialis generic recommend any red cross cialis on line form

Reply

area viagra for sale sexual disorders surgery cialis erectile dysfunction worth spending cialis feature effectively treat viagra no prescription natural penis

Reply

putting free car insurance however allows them cheap car insurance insurance vehicle type auto insurance cheap see while car insurance quotes competition

Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>