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Message boards : Number crunching : Is doing CPU WUs worth it, if you do GPU WUs?
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Qax

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Message 60788 - Posted: 22 Jan 2014, 13:03:34 UTC

Is it even worth it for me to crunch CPU WUs if I can crunch GPU ones? Are there some WUs that *need* to be processed by a CPU, or are those WUs only made for people without GPUs essentially? Basically are these resources better spent just going towards a CPU only project (and might they take away what Milkyway gets on the GPU?). Just - is there honestly a reason for me to crunch CPU WUs for Milkyway if I can crunch GPU ones as well?
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swiftmallard
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Message 60793 - Posted: 22 Jan 2014, 19:57:25 UTC

N-body work units need to be crunched with a CPU. Whether or not it's "worth it" for you to crunch them is up to you.
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Andrew McFarland
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Message 60822 - Posted: 26 Jan 2014, 23:45:32 UTC

Short answer: probably not.
Long answer: It depends on how much it takes away from the CPUs feeding the GPUs. My rule of thumb is 1 (dedicated) core per GPU. I found that 4x Radeon 6950's being fed by a quad-core i7, slowed their throughput more than the microscopic credit earned by running CPU-only tasks in tandem.
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[TA]Assimilator1
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Message 60829 - Posted: 27 Jan 2014, 17:53:41 UTC

Does depend on the GPU somewhat, older GPUs don't really need a dedicated CPU core, my HD 4870 used to run at nr 100% load with all my CPUs running Folding or Asteroids. My 5850 though is at ~80% load.
However my rigs totally output between the 2 projects is higher leaving all cores crunching.

Tony
What would your 6950s load be at if you crunched with all CPU cores?
Team AnandTech - SETI@H, Muon1 DPAD, F@H, MW@H, A@H, LHC@H, POGS, R@H, Einstein@H, DHEP.

Main rig - i7 4930k @4.1 GHz, RX 580 8 GB, 16 GB DDR3 1866, Win 7 64bit
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Message boards : Number crunching : Is doing CPU WUs worth it, if you do GPU WUs?

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