public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug gcov-profile/90364] 521.wrf_r is 8-17% slower with PGO at -Ofast and native march/mtune Date: Wed, 08 Sep 2021 15:54:18 +0000 [thread overview] Message-ID: <bug-90364-4-9HhMuSp927@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-90364-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90364 Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marxin at gcc dot gnu.org --- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> --- All right, I understand what goes wrong. The benchmark builds 2 binaries: wrf_r and diffwrf_521. Both of them contain pretty much the same objects that *are* built twice: gfortran -c -o module_mp_wsm5.fppized.o -I. -I./netcdf/include -I./inc -O2 -march=native -std=legacy -fprofile-generate -fconvert=big-endian -fno-openmp -g0 module_mp_wsm5.fppized.f90 then wrf_r is trained, module_mp_wsm5.fppized.gcda is properly created. But then diffwrf_521 is invoked and the GCDA if overwritten: $ export GCOV_ERROR_FILE=/tmp/wrf.txt ... $ grep wsm5 /tmp/wrf.txt libgcov profiling error:/home/marxin/Programming/cpu2017/benchspec/CPU/521.wrf_r/build/build_peak_gcc-m64.0000/module_mp_wsm5.fppized.gcda:overwriting an existing profile data with a different timestamp That explains why we end up with a profile that has relatively low sum_max=4450478, as shown the profile comes from a verification binary diffwrf_521. I don't have an easy solution for that. Maybe we can somehow drop -fprofile-generate for diffwrf_521 binary. Is it possible?
next prev parent reply other threads:[~2021-09-08 15:54 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-90364-4@http.gcc.gnu.org/bugzilla/> 2020-03-30 18:21 ` jamborm at gcc dot gnu.org 2021-09-08 15:54 ` marxin at gcc dot gnu.org [this message] 2021-09-09 6:04 ` rguenth at gcc dot gnu.org 2021-09-10 7:45 ` marxin at gcc dot gnu.org 2021-10-13 13:27 ` cvs-commit at gcc dot gnu.org 2021-10-13 13:48 ` marxin at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-90364-4-9HhMuSp927@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).