Hi all!
While hunting for a bug recently, we at Einstein@Home came across a
question that I would like to present for discussion here:
If an app has a non zero GPU share ("GPU app" for short), should CPU
throttling (as configured thru the preferences setting "Use at most x % of
CPU time") be applied to it?
I guess there are several pros and cons, e.g.:
cons:
- one one hand, GPU apps (depending on the CPU share?) get a higher OS
prio (in terms of "niceness") to prevent the GPU being starved. Throttling
the CPU might very well cause this starvation
- if a GPU app has a rather low CPU runtime share in the first place,
further CPU throttling does not seem too useful.
- in order to avoid GPU load to interfere with the user doing non-BOINC
related stuff, there is already the setting "Suspend GPU work while
computer is in use".
pros:
I can't think about many, maybe consistency and user expectation?
Volunteer reports at E@H seem to suggest that in the current BOINC client
version, GPU apps are indeed CPU throttled, right?
Browsing thru the source code, my initial impression is that only NCI
(non-CPU-intensive) apps are excluded from throttling.
Cheers
HB
-----------------------------------------------------------------
Heinz-Bernd Eggenstein
Max Planck Institute for Gravitational Physics
Callinstrasse 38
D-30167 Hannover, Germany
Tel.: +49-511-762-19466 (Room 037)
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