On Thu, 25.02.2010 at 10:08:15 +0200, David Naylor wrote: > Hi, > > As some may have noticed on -current I have been working on using > stacked unionfs to implement a 'tinderbox' type build system. I have > successfully used the scripts to build x11/xorg (and have compared the > results to using the traditional approach using pkg_add). The build > system is stable except for one nasty corner case: deadlocks.
When I did this a couple of years ago, the major problems were failing chdir(2) calls during ports build, etc. > To setup a compatible test environment requires: > - recompile the kernel with `options KSTACK_PAGES=32`, otherwise the > kernel will panic with a double fault. WITNESS options results in > substantial performance degradation. > - patch mtree (see below) [optional] > - create the appropriate chroot environment (and reboot) [see below > for corner case] > > A performance bottleneck in mtree was identified. This resulted in > mtree (as run by port install) consuming ~20% of the build time. See > bin/143732 for a patch and further details. Good work! > The normal tinderbox approach takes ~80% more time to install compared to the > quick and dirty approach. The stacked unionfs approach takes ~170% more time > (an increase of ~50% over the tinderbox approach). Some performance gains can > be had if one uses memory backed storage (vs HDD in this case). Please explain: what is the quick and dirty approach and which one is faster now? As your scripts did not make it through, perhaps you can upload them to the wiki? What I did back then was using a clean base system as the underlying unionfs store to avoid re-generating the clean base over and over again. Nowadays, a ZFS clone would probably be the way to go. I'm not sure if a recursive approach is feasible here, as you can have only one underlying unionfs mount. But special casing, e.g., perl may still give a massive speedup. So for each port that has perl as dependancy, you would not pull in the clean base + pkg_add perl, but instead grab the clean-base+perl directory as an underlying unionfs. Cheers Uli _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
