We had some discussion about this issue back in January. For most of the lifetime of BOINC on GPUs, CPU throttling has *not* been applied to GPU apps:
it was dis-applied on 27 Oct 2008 - http://boinc.berkeley.edu/trac/changeset/3719268f1c3807dcac821c455090e2243133bb8d/boinc-old and re-applied on 12 Jan 2013 - http://boinc.berkeley.edu/trac/changeset/04de2936d47256edc77ba032541b096aff69b2d5/boinc-old The re-application seemed to be at the request of a single user: David wrote "I checked in a change so that CPU throttling applies to GPU apps also. Can anyone think of a reason not to do this? -- David On 11-Jan-2013 11:42 PM, Admin Team "St.Petersburg" wrote: > And here's another. In the client, the CPU has the ability to change power > steering, and the GPU can not. To do." That message, and the subsequent discussion, can be followed at http://lists.ssl.berkeley.edu/pipermail/boinc_dev/2013-January/019305.html >From memory (and a very quick refresh view of that thread) the main response >was a request for a separate control to throttle GPU apps if desired - we >concluded with "The request for a separate GPU throttling preference is noted; however we're not going to get to it immediately. -- David" >________________________________ > From: Heinz-Bernd Eggenstein <heinz-bernd.eggenst...@aei.mpg.de> >To: boinc_dev@ssl.berkeley.edu >Sent: Thursday, 4 July 2013, 12:15 >Subject: [boinc_dev] CPU throttling and GPU apps > > >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) >_______________________________________________ >boinc_dev mailing list >boinc_dev@ssl.berkeley.edu >http://lists.ssl.berkeley.edu/mailman/listinfo/boinc_dev >To unsubscribe, visit the above URL and >(near bottom of page) enter your email address. > > > _______________________________________________ boinc_dev mailing list boinc_dev@ssl.berkeley.edu http://lists.ssl.berkeley.edu/mailman/listinfo/boinc_dev To unsubscribe, visit the above URL and (near bottom of page) enter your email address.
