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SETI MB CUDA for Linux
CorranHorn:
The windows version is faster than the linux version.
http://setiathome.berkeley.edu/workunit.php?wuid=423584760
Crunch3r:
--- Quote from: CorranHorn on 13 Mar 2009, 08:39:48 am ---The windows version is faster than the linux version.
http://setiathome.berkeley.edu/workunit.php?wuid=423584760
--- End quote ---
No It's not faster. You should get some info about the reported 'CPU time' first and the difference between the win & linux app, before posting such a BS... ::)
Raistmer:
More correctly - Linux build uses much more CPU time than Windows one. Why it doing so - that's the question.
Jason G:
--- Quote from: Raistmer on 13 Mar 2009, 10:51:06 am ---More correctly - Linux build uses much more CPU time than Windows one. Why it doing so - that's the question.
--- End quote ---
LoL I'm with Crunch3r on this one. Because CPU time is a useless measure of GPU app performance, and depends on how the OS defines CPU time. Where and how cpu time is attributed to the user program or kernel time will vary by platform, along with the methods used for handling the GPU feeding.
When dealing with a parallel program, you can only go by Wall clock time on Same AR WUs only. The scheduling and accounting semantics between the two OSes will be vastly different, and likely the Linux figure is just being 'more honest'.
Jason
Raistmer:
No, you missed that if CPU is busy - it's busy.
But if CPU free - it can be used somewhere else.
It seems in Linux CPU is busy all time CUDA app runs (I can do conclusions only by read posts of course, didn't run it on own host).
ADDON: on windows I studied total run time (elapsed) for busy cores with CUDA app so pretty confident, CPU is almost FREE while CUDA app running INDEED.
Windows doesn't cheat here as you suppose.
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