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From: Nick Desaulniers <ndesaulniers@google.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: Very slow clang kernel config ..
Date: Thu, 29 Apr 2021 19:22:27 -0700
Message-ID: <CAKwvOdk+V2dc31guafFM=N2ez4SrwCmah+mimUG3MzPMx_2efQ@mail.gmail.com> (raw)
In-Reply-To: <CAKwvOdmMF_v9TzBtFn2S1qSS_yCDO8D-u3WhBehUM7gzjcdjUQ@mail.gmail.com>

On Thu, Apr 29, 2021 at 5:19 PM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> On Thu, Apr 29, 2021 at 2:53 PM Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> >
> > I haven't looked into why this is so slow with clang, but it really is
> > painfully slow:
> >
> >    time make CC=clang allmodconfig
> >    real 0m2.667s
> >
> > vs the gcc case:
> >
> >     time make CC=gcc allmodconfig
> >     real 0m0.903s
>
> Can
> you provide info about your clang build such as the version string,
> and whether this was built locally perhaps?

d'oh it was below.

> > This is on my F34 machine:
> >
> >      clang version 12.0.0 (Fedora 12.0.0-0.3.rc1.fc34)

-- 
Thanks,
~Nick Desaulniers

  reply index

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29 21:53 Linus Torvalds
2021-04-30  0:19 ` Nick Desaulniers
2021-04-30  2:22   ` Nick Desaulniers [this message]
2021-05-01  0:19     ` Nick Desaulniers
2021-05-01  0:23       ` Nick Desaulniers
2021-05-01  0:25         ` Nick Desaulniers
2021-05-01  0:40           ` Nick Desaulniers
2021-05-01  1:22           ` Linus Torvalds
2021-05-01  1:48             ` Nick Desaulniers
2021-05-01  2:16               ` Fangrui Song
2021-05-01  3:32               ` Tom Stellard
2021-05-01 16:32                 ` Linus Torvalds
2021-05-01 19:57                   ` Serge Guelton
2021-05-01 22:39                     ` Linus Torvalds
2021-05-01 23:55                       ` Fangrui Song
2021-05-01 21:58                   ` David Laight
2021-05-02  9:31                   ` Adrian Bunk
2021-05-02 11:35                     ` David Laight
2021-05-02 16:12                     ` Linus Torvalds
2021-05-02 16:45                       ` Adrian Bunk
2021-05-02 16:49                         ` Linus Torvalds
2021-05-02 17:55                           ` Adrian Bunk
2021-05-02 17:59                             ` Linus Torvalds
2021-05-02 21:48                               ` Adrian Bunk
2021-05-04 22:02                                 ` Miguel Ojeda
2021-05-05  0:58                                   ` Theodore Ts'o
2021-05-05 17:21                                     ` Miguel Ojeda
2021-05-04 21:32                     ` Miguel Ojeda
2021-05-05 11:05                       ` David Laight
2021-05-05 13:53                         ` Miguel Ojeda
2021-05-05 14:13                           ` David Laight
2021-05-05 16:06                             ` Miguel Ojeda
2021-05-05 16:25                               ` David Laight
2021-05-05 17:55                                 ` Miguel Ojeda
2021-05-03  1:03                   ` Maciej W. Rozycki
2021-05-03 14:38                     ` Theodore Ts'o
2021-05-03 14:54                       ` Theodore Ts'o
2021-05-03 17:14                         ` Maciej W. Rozycki
2021-05-03 16:09                       ` David Laight
2021-05-04 23:04                       ` Greg Stark
2021-05-05  0:55                         ` Theodore Ts'o
2021-05-01 23:37               ` Mike Hommey
2021-05-02  5:19               ` Dan Aloni
2021-05-03 16:48                 ` Tom Stellard
2021-05-03 19:00                   ` Fangrui Song
2021-04-30  0:52 ` Nathan Chancellor
2021-04-30  2:21   ` Nick Desaulniers

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