Date: Tue, 25 Jun 2019 08:02:45 -0700 From: bob prohaska <fbsd@www.zefox.net> To: Daniel Engberg <daniel.engberg.lists@pyret.net> Cc: freebsd-arm@freebsd.org, bob prohaska <fbsd@www.zefox.net> Subject: Re: Buildworld seems to have slowed lately Message-ID: <20190625150245.GA44519@www.zefox.net> In-Reply-To: <fb3c06fafa6388e5d260fe6ae76d2f44@pyret.net> References: <fb3c06fafa6388e5d260fe6ae76d2f44@pyret.net>
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On Tue, Jun 25, 2019 at 09:35:06AM +0200, Daniel Engberg wrote: > > Without details it's a bit hard to give you any suggestions but for > instance a new version of llvm/clang has been imported which may account > to some of the slowdown. > Is the update of clang the only change? If so, maybe that's it. Surprising nonetheless. The system is a Pi3, unaltered for about six months. During buildworld it often shows near zero cpu activity, seemingly while installing files. I wondered if maybe something had changed in the filesystem drivers or scheduler. The machine uses a goodly amount of swap, but only for two brief intervals during buildworld. That slowdown is normal, expected and relatively brief. The pattern is to run make cleandir twice, then remove /usr/obj, then make -j4 buildworld with whatever settings are default. I belive those steps are somewhat redundant but do so for consistency with past practice. It might be worth noting that /boot/loader.conf contains one special line: vm.pageout_oom_seq="2048" to give the system enough patience to use the 4 GB of available swap. None of this is new, however, and the periods of high idle time don't always conincide with high swap use. Thanks for reading! bob prohaska
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