| From: | Jelte Fennema-Nio <postgres(at)jeltef(dot)nl> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Nazir Bilal Yavuz <byavuz81(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Subject: | Re: Speed up clean meson builds by ~25% |
| Date: | 2024-04-08 08:36:59 |
| Message-ID: | CAGECzQQMNTWWXq1Es3JvqEv=Yk5uUv3buLictYvdvjZd79uBbQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, 8 Apr 2024 at 10:00, Alexander Lakhin <exclusion(at)gmail(dot)com> wrote:
> As I wrote in [1], I didn't observe the issue with clang-18, so maybe it
> is fixed already.
> Perhaps it's worth rechecking...
Using the attached script I got these timings. Clang is significantly
slower in all of them. But especially with -Og the difference between
is huge.
gcc 11.4.0: 7.276s
clang 18.1.3: 17.216s
gcc 11.4.0 --debug: 7.441s
clang 18.1.3 --debug: 18.164s
gcc 11.4.0 --debug -Og: 2.418s
clang 18.1.3 --debug -Og: 14.864s
I reported this same issue to the LLVM project here:
https://github.com/llvm/llvm-project/issues/87973
| Attachment | Content-Type | Size |
|---|---|---|
| compile.sh.txt | text/plain | 827 bytes |
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