Thread 'How to run 10 tasks at the same time on an Intel Core 2 under linux'

Message boards : BOINC Manager : How to run 10 tasks at the same time on an Intel Core 2 under linux
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Julian Manzanaro
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Message 41510 - Posted: 6 Dec 2011, 21:54:10 UTC

Here is a tutorial about how to run 10 tasks at the same time on a dual core cpu , as you can see in the following image , the activity is normal . 2 cores=2 WUs



But , lets do the experiment , i have used the QEMU cpu emulator under Linux , in the following image you can see i have configurated QEMU to emulate 8 Cpus.



Now , lets start the virtual machine , i installed SliTaz linux 2.0 on the virtual machine , and installed BOINC 6.10.58 , i couldn't install the newer version due to library problems , anyway , now everything is done , see the following image , as you can see , QEMU emulates a Pentium 2 with eight cores, and the virtual machine is running eight SIMAP workunits ,



What do you think ?
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ProfileJord
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Message 41514 - Posted: 6 Dec 2011, 23:38:36 UTC

What's the use? Emulating 8 CPUs on a 2 CPU system will only run all that work extremely slowly as those 2 CPUs will still have to do all the work. You can just as well set <ncpus>10</ncpus> if you want to run 10 tasks on a 2 CPU system.
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Julian Manzanaro
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Message 41517 - Posted: 7 Dec 2011, 7:10:31 UTC - in response to Message 41514.  

Wow ! i didn't know about that!, but this method is not too slow , without the emulated CPU , my computer takes 1 hour on simap , with the 8 virtual cores takes 3 hours per WU
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Julian Manzanaro
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Message 41520 - Posted: 7 Dec 2011, 14:23:28 UTC - in response to Message 41518.  

yes ,they dont take more than 3 hours per WU
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ProfileJord
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Message 41539 - Posted: 9 Dec 2011, 11:27:26 UTC - in response to Message 41536.  

What Ebay, I'll sell it to you and it won't be cheap. ;-)

Anyway, I won't go into trying to explain why this works as such --other than hinting at tasks with different run times, earlier heat related problems and cleansing of the dust bunnies, or the user not being completely honest about the pictures used-- but instead warn that anyone wanting to use the above method to run more work than he or she has actual CPUs is doing so at their own choice.

That when your hardware grinds to a halt, that it isn't BOINC its fault, as no one at Berkeley or these forums forced you to run more tasks than you have actual CPUs.
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Message boards : BOINC Manager : How to run 10 tasks at the same time on an Intel Core 2 under linux

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