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SETI MB CUDA for Linux
riofl:
i think i will keep my 2.6.29 kernel on my desktop then... unfortunately i have to update several of my servers to 2.6.31 due to application requirements, so those machines, unfortunately, will probably suffer. i have the script on them for cpu setting them to 10 to see how things go and how server performance is affected if at all. the rest of the servers i will probably leave with the 2.6.26 kernels they now have (if it ain't broke dont fix it) :) .
riofl:
over the short term, i am seeing an average of 2 to 3 minutes lower processing times per workunit on the gpus at nice 0. nice boost.
pp:
--- Quote from: riofl on 02 Nov 2009, 06:02:59 am ---can you run gpus at higher levels sucn as -1 or so or is it the nature of the gpu system to not go below 0? just wondering if there is only marginal benefit at running them at -1 or maybe even -5.
--- End quote ---
You can run them at -5 if you like but I didn't notice any difference in speed running them at -5 compared to 0.
sunu:
--- Quote from: riofl on 02 Nov 2009, 06:02:59 am ---can you run gpus at higher levels sucn as -1 or so or is it the nature of the gpu system to not go below 0? just wondering if there is only marginal benefit at running them at -1 or maybe even -5.
--- End quote ---
Some time ago, I've tried with negative priorities in my 2.6.27-14 ubuntu kernel and they had... negative effect, the tasks ran slower, but I don't remember if the slowdown was for the GPU tasks or the CPU ones or for both.
I'm trying right now the same in sidux with 2.6.31-5.slh.1-sidux-amd64 (-5 nice for cuda tasks, 19 for cpu) and it doesn't seem to make any difference over 0 for GPU and 19 for CPU ( http://setiathome.berkeley.edu/results.php?hostid=3690316 ). All results dated 2 Nov are with -5 for GPU and 19 for CPU, the rest are with 0 for GPU and 19 for CPU. They seem about the same to me. In this machine using the "default" (10 for GPU and 19 for CPU) results in doubling up computation times for CUDA tasks.
riofl:
i dont get that radical a change in processing times.. seems i never do compared to you. what mobo are you using? i believe you said you had a q6600 processor which is the same one i have. i did notice an apparent slow down using -5 so i went back to 0 but again that was short term. for some reason i don't get nearly the response you do so i am beginning to suspect it may be my gigabyte ga-p35-ds4 mobo. i may try upgrading it to an asus rampage formula or something similar. this machine does not need more than 2 pci-e slots although i suspect if there were more than 2 i could spread the 2 gpu devices out farther away from each other to help minimize heat buildup. then i might not need that little 1 in fan moving air between them.
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