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tekennelly
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WCG computing constrained by disk - howto move to another disk

I am running a heavy I/O load on the c drive of my Windows 7 quad core machine. I have plenty of compute power that is going unused because of I/O delays.

How can I reduce the amount of I/O activity WCG wu require or how can I move the BOINC work files to a different disk. Is anyone using RAM Disk for the work files (i.e., checkpoint?)?

I have used the preference "task checkpoint to disk at most every" setting, which I have set to 6000, reduce BOINC's I/O rate but am unsure whether that makes a difference? Can I eliminate any checkpointing altogether.

P.S. I have enabled the "Leave applications in memory while suspended" but it would not seem to be needed since I allow BOINC to use 100% CPU while the computer is in use and have 8 GB of memory installed.
[Dec 23, 2010 9:55:07 PM]   Link   Report threatening or abusive post: please login first  Go to top 
Bearcat
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Re: WCG computing constrained by disk - howto move to another disk

You must be talking about cep2. Allot of talk in that forum for different fixes. Don't think much has come up. Best thing is a fast disk and don't let to many crunch at the same time. On my raptor drive, if I crunch 1, about 30 minutes between crunching time and actual time. When multiple crunch, the difference grows to sometimes over an hour. The mega size files clog my Internet bad so I only upload while I'm asleep. That project is a bit of a pain, but like the others, need to be done.
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[Dec 23, 2010 10:37:01 PM]   Link   Report threatening or abusive post: please login first  Go to top 
wplachy
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Re: WCG computing constrained by disk - howto move to another disk

Hi tekennelly

I can answer and/or point you to discussions for some of your questions.

reduce the amount of I/O activity? I don't know of anyway other then what you have already done. Someone else may have the answer(s)

move the BOINC work files? The easiest way I have found is to:
1) Uninstall BOINC
2) Copy the data folder to the new drive, be sure to copy all files and sub-folders
3) Re-install BOINC using the Advanced Options and point the data location to the BOINC data folder you created on the new drive.

If you don't know the location of your BOINC data directory open the messages tab and scroll up to the top. You should see a line near the very beginning that looks like this:
12/23/10 04:19:15 PM Data directory: C:\WCG\Data

In the above mine is located on the C: Drive in a folder named \WCG\Data

is anyone using a RAM disk? This thread https://secure.worldcommunitygrid.org/forums/wcg/viewthread_thread,30244 has a good deal of discussion with mixed results. Also, if SSD is an option for you look at this thread https://secure.worldcommunitygrid.org/forums/wcg/viewthread_thread,30330


By increasing the checkpoint time you are increasing your risk of losing CPU cycles if you shutdown BOINC or the system. On a restart BOINC will pick up from the last checkpoint written. The farther you space them the more time lost on a restart.

eliminate checkpointing? Can't answer that one.

Leave apps in memory comes into play if an active task is suspended. If unchecked when the task restarts it will go back to the last checkpoint. Again, risk is lost cycles. I don't think this option will make any difference in you IO load if selected or not other than the possibility of some increased paging if selected.

Bill P
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[Dec 23, 2010 10:45:29 PM]   Link   Report threatening or abusive post: please login first  Go to top 
tekennelly
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Re: WCG computing constrained by disk - howto move to another disk

Thanks. Following the links you provided now.
[Dec 23, 2010 10:59:32 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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