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* [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2
@ 2024-03-21 10:35 pheeck at gcc dot gnu.org
2024-03-21 10:36 ` [Bug target/114414] " pheeck at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: pheeck at gcc dot gnu.org @ 2024-03-21 10:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414
Bug ID: 114414
Summary: [14 Regression] 15-18% exec time slowdown of 433.milc
on Zen2
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: missed-optimization, needs-bisection
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: pheeck at gcc dot gnu.org
Blocks: 26163
Target Milestone: ---
Host: x86_64-linux
Target: x86_64-linux
As seen here
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=685.70.0
there is an 18% slowdown of the 433.milc SPEC 2006 benchmark between commits
g:74e8cc28eda9b1d7
g:81ee1298b47d3f3b
The compilation options are -O2 -flto PGO. The CPU is AMD Zen2. I've replicated
this slowdown on another Zen2 machine. There the slowdown was only 15%.
Btw here is the same plot but with comparisons to GCC13 and GCC12
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=685.70.0&plot.6=921.70.0&plot.7=762.70.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug target/114414] [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org @ 2024-03-21 10:36 ` pheeck at gcc dot gnu.org 2024-03-22 12:34 ` law at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-03-21 10:36 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |14.0 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/114414] [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org 2024-03-21 10:36 ` [Bug target/114414] " pheeck at gcc dot gnu.org @ 2024-03-22 12:34 ` law at gcc dot gnu.org 2024-03-27 8:02 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: law at gcc dot gnu.org @ 2024-03-22 12:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414 Jeffrey A. Law <law at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |law at gcc dot gnu.org Priority|P3 |P2 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/114414] [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org 2024-03-21 10:36 ` [Bug target/114414] " pheeck at gcc dot gnu.org 2024-03-22 12:34 ` law at gcc dot gnu.org @ 2024-03-27 8:02 ` rguenth at gcc dot gnu.org 2024-03-28 10:33 ` [Bug target/114414] " pheeck at gcc dot gnu.org 2024-03-28 12:12 ` pheeck at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2024-03-27 8:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- I'll note the performance is now again close to that of 12/13 but improvements have been lost (so it might be not called a 14 regression). ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/114414] 15-18% exec time slowdown of 433.milc on Zen2 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org ` (2 preceding siblings ...) 2024-03-27 8:02 ` rguenth at gcc dot gnu.org @ 2024-03-28 10:33 ` pheeck at gcc dot gnu.org 2024-03-28 12:12 ` pheeck at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-03-28 10:33 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[14 Regression] 15-18% exec |15-18% exec time slowdown |time slowdown of 433.milc |of 433.milc on Zen2 |on Zen2 | --- Comment #2 from Filip Kastl <pheeck at gcc dot gnu.org> --- (In reply to Richard Biener from comment #1) > I'll note the performance is now again close to that of 12/13 but > improvements have been lost (so it might be not called a 14 regression). I misunderstood what [14 Regression] means exactly. I'll remove it from the bug's name. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/114414] 15-18% exec time slowdown of 433.milc on Zen2 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org ` (3 preceding siblings ...) 2024-03-28 10:33 ` [Bug target/114414] " pheeck at gcc dot gnu.org @ 2024-03-28 12:12 ` pheeck at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-03-28 12:12 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114414 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #3 from Filip Kastl <pheeck at gcc dot gnu.org> --- It looks like the benchmark went back to its original values so I'm closing this PR. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-03-28 12:12 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-03-21 10:35 [Bug target/114414] New: [14 Regression] 15-18% exec time slowdown of 433.milc on Zen2 pheeck at gcc dot gnu.org 2024-03-21 10:36 ` [Bug target/114414] " pheeck at gcc dot gnu.org 2024-03-22 12:34 ` law at gcc dot gnu.org 2024-03-27 8:02 ` rguenth at gcc dot gnu.org 2024-03-28 10:33 ` [Bug target/114414] " pheeck at gcc dot gnu.org 2024-03-28 12:12 ` pheeck at gcc dot gnu.org
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