Multiple GPU systems

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Dad

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Joined: 28 Feb 18
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Hi All,

I'm about to 'dip my toe' in the Manual Sieving waters and have the following question(s);

On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?
On a multi GPU system, does Sieving 'automatically' use both GPUs?
On a multi GPU system where one GPU is much better than the other, does Sieving care?

Thanx

Dad
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and

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Rafael
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On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?

Yes. The sieve app runs on a single GPU at a time, and you can tell which one to use. Meanwhile in BOINC, you can tell it to ignore a given device so that it won't use it.

On a multi GPU system, does Sieving 'automatically' use both GPUs?

See above. If you want to run on more than one GPU at a time, you'll have to launch the app individually for each of them.

On a multi GPU system where one GPU is much better than the other, does Sieving care?

The app doesn't care for how good a GPU you use, so long as it supports the necessary features. Whether it's worth to sieve or use the card for something else, that's up to the user to decide.

But generally speaking, I find that Nvidia GPUs are better at sieving and AMD's are better at crunching.

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Penguin

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Hi All,

I'm about to 'dip my toe' in the Manual Sieving waters and have the following question(s);

On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?
On a multi GPU system, does Sieving 'automatically' use both GPUs?
On a multi GPU system where one GPU is much better than the other, does Sieving care?

Thanx

Dad

When you run the sieve app you can specify D0 or D1 to use device 0 or device 1 each being your separate GPUs. This goes at the end of your command line. W1 reduces cpu usage and Bx is the block size. Change x to 8-13 to see if it improves performance. Default is B7.

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