On Tue, 2011-04-05 at 16:30 +0100, Ian Malone wrote: > Richard G. Edgar wrote: > > On Tue, 2011-04-05 at 11:23 +0200, Knut J Bjuland wrote: > > > > > Will a Tesla C2050 or another good CPU be able to reduce the running > > > time from 20-24 hr to less time like for instance 8hr or below that > > > time. > > > > > > > On the standard test case we use here, a full recon-all run takes 8 > > hours on a 3.2 GHz Nehalem core, and about 4 hours 20 mins when using > > the Tesla C2050. > > > > > > Would I be right in concluding that a 4-core Nehalem (e.g. i7) has > more throughput than the C2050 then?
Yes, but less than having 3 CPU jobs, and one GPU one. I did test once, and there isn't much penalty to running one recon-all job per core on a Nehalem system. Right now, the CPU still does most of the work in the recon-all stream - it's something of a game of Amdahl's Law Wac-A-Mole. You could always try starting 4 GPU jobs at once.... I've not done the testing, but a C2050 would probably have enough RAM, and in any given recon-all run, the GPU does spend a lot of time idle. Hence, it would end up being divvied up between the four jobs. Richard _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
