I fixed that particular bug (please review the change). This code with written without multi-GPU apps in mind. There may be other bugs related to multi-GPU apps. -- David
On 08-Jun-2015 3:20 PM, Teemu Mannermaa wrote:
Hello, Once again I've been tracking interesting bug in the BOINC Client. Looks like at least since v7.0.64 multi-GPU scheduling has been broken and the BOINC Client never schedules a task that requires more than one GPU but instead insist that there is never enough GPU resources available. Debug log for BOINC Client shows: [cpu_sched_debug] insufficient NVIDIA for <wu name> and this doesn't work even for latest recommended release v7.4.42 and seems to affect both Linux and Windows. :( I believe the problem stems from function at https://github.com/BOINC/boinc/blob/master/client/cpu_sched.cpp#L209 that has some funky logic and.. wait, does that code indeed require that if an App Version specifies 2 or more GPUs then ONE (1) GPU is supposed to provide those resources? Seriously? No wonder it's never sufficient.. Luckily for Moo! Wrapper only our old app requires all GPUs for the host and newer app can use one GPU per task. Given that this has been around for so long I'd guess most GPU apps restrict themselves to one GPU only but it's still a problem and causes wasted GPU resources if hit.
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