Date: Mon, 22 Jun 2020 15:18:42 +0200 From: Michael Grimm <trashcan@ellael.org> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: Buildworld and buildkernel with very slow compilation, recently Message-ID: <7D2B7FF1-831E-4958-812F-B5501148C57F@ellael.org> In-Reply-To: <BDBC8C51-5C41-473E-A1EB-74BB5A375C54@FreeBSD.org> References: <2D4CD117-99D0-4A03-8FBC-002CDFFE64F9@ellael.org> <5403888.XOh7uYVVfo@behemoth.lan> <BDBC8C51-5C41-473E-A1EB-74BB5A375C54@FreeBSD.org>
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Dimitry Andric <dim@FreeBSD.org> wrote: >=20 > On 21 Jun 2020, at 14:36, Chris Nehren <cnehren@pobox.com> wrote: >> On Sunday, June 21, 2020 8:11:15 AM EDT Michael Grimm wrote: >>> Hi, >>>=20 >>> I am following FreeBSD 12.1-STABLE. >>>=20 >>> Clang has been upgraded to version 10.0.0 on May, 1st, and ever = since that >>> time, I do observe a dramatic increase in compilation times of = building >>> world, kernel and ports. I didn't benchmark the exact times, but >>> compilation times are at least increased by a factor of 1.5. Nothing = has >>> changed of the last month besides upgrading 12.1-Stable every other = week. >>>=20 >>> Has anyone else been bitten by this? >>=20 >> I don't have measurements to corroborate this, but here's a mailing = list >> thread where folks are talking about it (split across two URLs, the = OP posted >> in April and then there was a followup in May): >>=20 >> http://lists.llvm.org/pipermail/llvm-dev/2020-April/140938.html >> https://lists.llvm.org/pipermail/llvm-dev/2020-May/141482.html >>=20 >> So there definitely seems to be *something* going on, and you are = indeed not >> crazy. :) >=20 > Indeed, there is some upstream discussion going on about this issue. > There are some scenarios where people see non-negligible performance > loss, but apparently not everybody suffers from it. If you build the > whole ports collection, it is rather likely you may bump into it. I = have > personally not seen much performance difference in building world, > kernel etc. >=20 > One of the upstream problems is that there is not really any > authoritative performance regression log being built up, so it is hard > to see where such regressions were introduced. Somebody then has to > spend a lot of time tracking down each and every regression, and then > attempt to untangle it from the dozens of commits made around the same > time. :) >=20 > In any case, there is at least some attention on it now, so hopefully > this will improve again. I don't think such fixes will be trivial > though, so it is not likely they will land in 10.0.1. >=20 > -Dimitry ok, so others see some performance loss as well. In the meantime I activated META_MODE and hope, that will speed-up my = weekly compilations. Thanks to all who answered, and regards, Michael
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