On Thu, Oct 11, 2012 at 8:28 PM, Adam Pribyl <pribyl@xxxxxxxxxxx> wrote: > On Thu, 11 Oct 2012, Andre Robatino wrote: > >> Jonathan Dieter has just made F16 and F17 Koji builds for the >> multithreaded >> yum-presto (currently only in F18 and Rawhide) which takes advantage of >> multiple >> cores. Since applydeltarpm maxes out the CPU, they will probably give a >> linear >> speedup. He doesn't plan to ever put the F16 version into updates-testing >> but >> might do it for F17 if it gets positive feedback. (I personally don't have >> multicore hardware so can only test for good behavior, not for the >> speedup.) >> >> https://bugzilla.redhat.com/show_bug.cgi?id=701711#c10 >> >> http://koji.fedoraproject.org/koji/buildinfo?buildID=359518 >> (yum-presto-0.9.0-1.fc16) >> >> http://koji.fedoraproject.org/koji/buildinfo?buildID=359516 >> (um-presto-0.9.0-1.fc17) >> > > > I've tried that, but the speedup is invisible. It runs on both cores I have > but the rebuild speed is same as old single threaded. If it runs on one core > the build speed drops to half. This is on SSD so disk throughput is hardly a > bottleneck. > > To be honest - when I started to use presto few years ago, it was rebuilding > packages at speed of 1MB/s. During years it slowly dropped to around > 600kB/s. With this version it peaks around 900kB/s but average is still > around 600kB/s, when only one applydeltarpm is runnig the rebuild drops to > 200-300kB/s. > Thats what I see. Here it went up from 1.2MB/s to 2.1-2.6MB/s (4 cores - 8 threads). Not sure how many threads it actually uses but this is not a linear speedup. Disk is an SSD as well. -- test mailing list test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
