Intel GPU and CPU at once

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Peter Hucker

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Message 437 - Posted: 25 May 2018, 11:10:21 UTC

Just noticed something - if you're using an Intel GPU (built into the CPU), then it runs much slower (a fifth of the speed) if the CPU cores are fully utilised. So if you're running GPU and CPU projects on it, you need to reduce the number of CPU cores you give to Boinc.
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Peter Hucker

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Message 439 - Posted: 25 May 2018, 11:19:59 UTC - in response to Message 437.  

Following on from this, is there any point? Does an Intel GPU do more work than an Intel CPU core?
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Peter Hucker

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Message 440 - Posted: 25 May 2018, 11:29:58 UTC - in response to Message 439.  

Answered my own question by running Einstein's LATeah on both. The GPU core is 4 times faster than 1 CPU core on an i5-3570K. Probably even more of a difference on the 8th generation chips, as their graphics is twice as fast, but a core is only 1.5 times faster.
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Message 446 - Posted: 26 May 2018, 15:06:13 UTC - in response to Message 440.  

I've checked into it some more, analysing my 5 computers with different CPUs. It seems some built in graphics are more powerful compared to their CPU cores, and some aren't. And some slow down more than others when the CPU cores are fully used. And some use the CPU core at the same time for some reason (different instruction sets for newer GPU and CPU cores causing the WU to run on both at once? - For example Asteroids on my i5-3570K with Einstein on it's GPU uses no CPU time for the GPU task. Do the same on my i5-8600K, and the GPU task uses a whole CPU core at the same time.) So it depends a lot on the chip. I've tried different projects on each without much difference, the main thing appears to be the design of the CPU. So I've set them all up differently to get the most work out of them :-)
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Message boards : Number crunching : Intel GPU and CPU at once


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