On Fri, 2011-08-12 at 19:06 +0800, Robert Yang wrote: > Hi folks, > > The build time of core-image-sato increases about 5 ~ 10 minutes than > the following commit: > > commit 5af197b55a4b779f1ec93186f0723026949ba2b5 > Author: Liping Ke <[email protected]> > Date: Fri Jun 3 08:22:40 2011 +0800 > > cache: Implement multiple extra cache fields request support > > On my host, > 1) the build time of 5af197b55a4b779f1ec93186f0723026949ba2b5 is: > > real 208m26.133s > user 241m29.280s > sys 47m0.630s > > 2) and: 068839698fe192d8846c0ed4db65861448e8e524 is: > > real 217m39.687s > user 255m34.150s > sys 48m21.510s > > > I use the bisect build method to find out which patch causes the time > increases, but the build time is not stable on my host(Ubuntu 11.04 64bit), > e.g., the build time of 1) is 208m at the first build, then "git co > other_commit" and build it, after about 10 builds, then go back to build > 5af197b55a4b779f1ec, the build time will increases about 8 minutes, I have > stopped the X and cron, at. This may have relationship with the linux > distribution and disk. > > So I have to restart the build, reboot the machine by two days, and go on the > build. It would be better if anyone has other good method. > > I think that for the next release(e.g., yocto 1.2), we can find a clean and > stable machine(for the distribution, maybe RHEL is more stable than Ubuntu) > to check the build time weekly, so that we can notice the performance issue > early.
I think we really need to get to the bottom of why the build times are so variable. Do we need to start doing these on a clean distro install? is a fresh boot good enough? is there a way we can clear out the VM caches and get reproducible times? reformat the build partition? If that really is just because of the nature of a chaotic system, can we get some better representation of build time to use as a benchmark? We could really do with finding a faster test (which would hopefully still be representative)... Cheers, Richard _______________________________________________ Openembedded-core mailing list [email protected] http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
