Reserving a core for Collatz
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Message boards : Number crunching : Reserving a core for Collatz

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Profile Skivelitis2
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Message 21412 - Posted: 5 Oct 2015, 10:10:08 UTC

How do I set up my system (Win 8.1, Intel HD Graphics) to reserve a core for Collatz GPU work? Currently crunching Collatz Sieve.

If the app number changes do I need to re-do?

Will this cause work in progress to fail?

Profile mikey
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Message 21414 - Posted: 5 Oct 2015, 11:29:21 UTC - in response to Message 21412.

How do I set up my system (Win 8.1, Intel HD Graphics) to reserve a core for Collatz GPU work? Currently crunching Collatz Sieve.

If the app number changes do I need to re-do?

Will this cause work in progress to fail?


Webpage, My account, computing preferences and change this:
On multiprocessors, use at most
Enforced by version 6.1+ 100% of the processors

to 99%, that will reserve one single cpu core for the gpu, or anything else, to use as Boinc will not. This will not be affected by any app changes what so ever.

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Message 21467 - Posted: 9 Oct 2015, 13:01:39 UTC - in response to Message 21412.

...reserve a core for Collatz GPU work...

Generally speaking, is it necessary to this? I've monitored WUs several times throughout their runs, particularly at the beginning and end, but I don't see a CPU being used very much (certainly not like GPUGrid). Am I just not looking at the right time(s)?
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Profile JohnMD
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Message 21468 - Posted: 9 Oct 2015, 16:26:25 UTC - in response to Message 21467.

...reserve a core for Collatz GPU work...

Generally speaking, is it necessary to this? I've monitored WUs several times throughout their runs, particularly at the beginning and end, but I don't see a CPU being used very much (certainly not like GPUGrid). Am I just not looking at the right time(s)?

Generally NOT for AMD

Profile Skivelitis2
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Message 21475 - Posted: 10 Oct 2015, 10:04:39 UTC - in response to Message 21467.

...reserve a core for Collatz GPU work...

Generally speaking, is it necessary to this? I've monitored WUs several times throughout their runs, particularly at the beginning and end, but I don't see a CPU being used very much (certainly not like GPUGrid). Am I just not looking at the right time(s)?


Have tried it and don't believe it is needed. Thought it may speed up the processing time and reduce lag. Don't use an optimized app. Collatz takes about 21-23% of a core on my machine, leaving the other 77-79% shared among four CPU work-units from whatever other project I am running.(Quad core system) When reserving a core, the app never uses the entire 25% so as small as it seems I'd rather have that remaining percentage working on something else. YMMV!

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Message 21477 - Posted: 10 Oct 2015, 10:17:27 UTC - in response to Message 21467.

...reserve a core for Collatz GPU work...


Generally speaking, is it necessary to this? I've monitored WUs several times throughout their runs, particularly at the beginning and end, but I don't see a CPU being used very much (certainly not like GPUGrid). Am I just not looking at the right time(s)?


The key is my system is different from your system so try it, if you like it better then reserve a core, if not then don't. Each pc is different in SOOO many ways that there is no hard and fast answer.

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Message 21503 - Posted: 12 Oct 2015, 18:02:42 UTC - in response to Message 21477.

mikey wrote:
The key is my system is different from your system so try it, if you like it better then reserve a core, if not then don't. Each pc is different in SOOO many ways that there is no hard and fast answer.

Yes, indeed. My host (Q6600, 4-ish GB RAM, GTX 570, Win7-64) seems to do fine with no dedicated CPU. Thanks for the feedback, guys!
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