Message boards :
Number crunching :
Balance CPU and GPUs
Message board moderation
Author | Message |
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hancocka Send message Joined: 19 May 00 Posts: 10 Credit: 4,574,614 RAC: 0 |
I've been experimenting with a new PC, Intel i7 Core 990x (6 Cores, 12 Threads), and two nVidia GTX590 in SLI. I've managed to install the Lunatics config, and experiment with the app_info.xml. I'm currently running 12 w/u per CPU, and 1 w/u per GPU (4 GPUs). from what I've read, I should be able to push maybe 2 or 3 w/u per GPU, at this point, when I alter CUDA value to 0.5, things get slow, and I do not see 2 w/u per GPU, maybe need to tweak more with the average and max ncpus values, which is currenty set to 0.04. any ideas? |
spitfire_mk_2 Send message Joined: 14 Apr 00 Posts: 563 Credit: 27,306,885 RAC: 0 |
Don't use SLI. |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
And disable the use of a CPU core or two. GPUs do require a little support from the CPU in their daily tasks. You also may want to experiment with disabling HT, and letting the CPUs run at full speed instead of half. In my early experiments with such settings, there was NO gain with running HT on. Others claimed small improvements in total processing, so YMMV applies. I personally always found it better to let the CPU cores run at full speed, which processes the GPU startup routines faster. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
hancocka Send message Joined: 19 May 00 Posts: 10 Credit: 4,574,614 RAC: 0 |
it does not seem to use SLI, as each w/u is given to each GPU |
hancocka Send message Joined: 19 May 00 Posts: 10 Credit: 4,574,614 RAC: 0 |
how do I disable a few cores, just change the percentage to use? how then do I jackup the w/us per GPU. |
hancocka Send message Joined: 19 May 00 Posts: 10 Credit: 4,574,614 RAC: 0 |
thanks guys disabled SLI, the event logs looks the same. 4 GPUs. and I've chamnged to use 85% of the CPU, so I've now got 10 w/u per processor (1 pre core) 4 w/u per GPUs. and changed CUDA from 1 to 0.5, so I've got 8 w/u per GPUs, and 10 w/u per processor, looks good, I wait for the meltdown! |
Bill G Send message Joined: 1 Jun 01 Posts: 1282 Credit: 187,688,550 RAC: 182 |
Keep a watch on your results as you are starting to get a number of errors. SETI@home classic workunits 4,019 SETI@home classic CPU time 34,348 hours |
Mike Send message Joined: 17 Feb 01 Posts: 34255 Credit: 79,922,639 RAC: 80 |
You definetly need to free more CPU cores running 4 GPUs with multiple instances. With each crime and every kindness we birth our future. |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
You definetly need to free more CPU cores running 4 GPUs with multiple instances. Very true, also needed with AMD/ATI GPUs, doesn't matter if Cross-Fire is enabled. Every GPU has 1 thread of an i7-2600, also running on higher frequncy by increasing the Base-Clock from 100 to 102 to 104MHz. Since the multiplier is locked, it's the only option and works OK. But I do have several driver-crashes, specially with SETI work?! NVidia GPUs also need sometimes a dedicated core, CPU time is higher on NVidia GPUs. Almost double compaired to AMD/ATI GPUs. I've set SETI the same way, 0.5CPU in stead of 0.04 so it uses 1 core/thread setting this in app_info.xml when doing 2 pper GPU 1 core/thread will be used, Einstein uses this setting too. This AMD/ATI host does Docking or Einsteins Gravity Wave search on CPU. SETI and Einstein only GPU. |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
You definetly need to free more CPU cores running 4 GPUs with multiple instances. 1,216.96 runtime 233.94 CPU time 118.06 Credit SETI@home Enhanced v6.10 (cuda_fermi) 2763176272 6628794 21 Dec 2012 | 17:29:59 UTC 21 Dec 2012 | 21:41:34 UTC Voltooid en gecontroleerd 1,570.51 runtime 102.46 CPU time. Less as NVidia GPUs. 118.06 Credit. SETI@home Enhanced Anoniem platform (ATI GPU) Both platforms run 2 tasks per GPU. |
hancocka Send message Joined: 19 May 00 Posts: 10 Credit: 4,574,614 RAC: 0 |
seems to be running okay, I'll watch for any new errors. |
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