While compiling with 6 proc $ cat /proc/cpuinfo Processor : AArch64 Processor rev 1 (aarch64) processor : 0 processor : 1 processor : 2 processor : 3 processor : 4 processor : 5 Features : fp asimd evtstrm CPU implementer : 0x50 CPU architecture: AArch64 CPU variant : 0x0 CPU part : 0x000 CPU revision : 1 Hardware : linux,dummy-virt I noticed via htop that only 5 of them are in use during make -j6. Processor 4 is not used. I'm not sure how / if that can be repeated. On 03/04/2016 23:18, Loic Dachary wrote: > Hi Martin, > > In your quest to understand why the arm64 qemu sometimes hangs when using as many processors as the host, maybe this will help. > > Today while watching an installation on an arm64 qemu machine, I noticed it was stuck in setting up fontconfig. So I logged in the machine, CPU was not busy, no IOwait either, a lot of free RAM. The host was also mostly idle. I straced the process and saw it moving. Unfortunately ( or maybe I was the cause of things starting to move on again ?) the font regeneration finished while I was observing and things seem to be going at a normal speed now. > > Note that there is almost a 2 hours gap between Setting up fontconfig and Regenerating fonts cache. > > Maybe the pattern we're sometime seeing (i.e. all blocked, not even possible to ssh) is another case of the same issue ? > > I'm starting to think we should bring this discussion to some arm64 mailing list or IRC channel but I don't know any. > > 2016-04-03 19:17:34,858.858 DEBUG:teuthology.misc:Setting up libgdk-pixbuf2.0-0:arm64 (2.30.7-0ubuntu1.2) ... > 2016-04-03 19:17:35,057.057 DEBUG:teuthology.misc:Setting up libthai-data (0.1.20-3) ... > 2016-04-03 19:17:35,183.183 DEBUG:teuthology.misc:Setting up libdatrie1:arm64 (0.2.8-1) ... > 2016-04-03 19:17:35,350.350 DEBUG:teuthology.misc:Setting up libthai0:arm64 (0.1.20-3) ... > 2016-04-03 19:17:35,546.546 DEBUG:teuthology.misc:Setting up fontconfig (2.11.0-0ubuntu4.1) ... > 2016-04-03 21:09:52,094.094 DEBUG:teuthology.misc:Regenerating fonts cache... done. > 2016-04-03 21:09:52,136.136 DEBUG:teuthology.misc:Setting up libpango-1.0-0:arm64 (1.36.3-1ubuntu1.1) ... > 2016-04-03 21:09:52,303.303 DEBUG:teuthology.misc:Setting up libgraphite2-3:arm64 (1.3.6-1ubuntu0.14.04.1) ... > 2016-04-03 21:09:52,465.465 DEBUG:teuthology.misc:Setting up libharfbuzz0b:arm64 (0.9.27-1ubuntu1) ... > 2016-04-03 21:09:52,641.641 DEBUG:teuthology.misc:Setting up libpangoft2-1.0-0:arm64 (1.36.3-1ubuntu1.1) ... > 2016-04-03 21:09:52,806.806 DEBUG:teuthology.misc:Setting up libpangocairo-1.0-0:arm64 (1.36.3-1ubuntu1.1) ... > 2016-04-03 21:09:52,971.971 DEBUG:teuthology.misc:Setting up libxcomposite1:arm64 (1:0.4.4-1) ... > > Cheers > -- Loïc Dachary, Artisan Logiciel Libre -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
