Op 13 apr. 2012, om 10:45 heeft Richard Purdie het volgende geschreven: > On Thu, 2012-04-12 at 07:34 -0700, Darren Hart wrote: >> >> On 04/12/2012 07:08 AM, Björn Stenberg wrote: >>> Darren Hart wrote: >>>> /dev/md0 /build ext4 >>>> noauto,noatime,nodiratime,commit=6000 >>> >>> A minor detail: 'nodiratime' is a subset of 'noatime', so there is no >>> need to specify both. >> >> Excellent, thanks for the tip. > > Note the key here is that for a system with large amounts of memory, you > can effectively keep the build in memory due to the long commit time. > > All the tests I've done show we are not IO bound anyway.
Consider this scenario: OS disk on spinning rust (sda1, /) BUILDDIR on spinning rust (sdb1, /OE) WORKDIR on SSD (sdc1, /OE/build/tmp/work) SD card in USB reader (sde1) When I do the following during a build all CPUs will enter IO wait and the build grinds to a halt: cd /media ; xz -d -c foo.img.xz | pv -s 3488M > /dev/sde That only touches the OS disk and the SD card, but for some reason the 3.2.8 kernel stops IO to the OE disks as well. do_patch for my kernel recipe has been taking more than an hour now, it usually completes in less than 5 minutes (a few hundred patches applied with a custom patcher, git-am). regards, Koen _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
