[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 Martin Liška changed: What|Removed |Added Resolution|WORKSFORME |--- Status|RESOLVED

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #9 from Jan Hubicka --- Also forgot to mention, it is also quite possible that some of the small divergences propagate themselves into differences in the histogram and thus differences in hot/cold decisions in completely unrelated

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #8 from Jan Hubicka --- The divergence for non-randomization seems under control. But it also seems that the divergence for randomized build is way too common to be explained by differences in number of conflicts for hashtables

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #7 from Martin Liška --- Created attachment 47697 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47697=edit GCOV dump diff There's still some difference, but rather small.

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 Martin Liška changed: What|Removed |Added Status|NEW |RESOLVED Resolution|---

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #5 from Martin Liška --- And there's also a difference in TOPN counters: diff -u a b --- a 2020-01-23 10:30:56.527098370 +0100 +++ b 2020-01-23 10:30:42.035189528 +0100 @@ -1,21 +1,21 @@ -== Stats for after == +== Stats for

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #4 from Martin Liška --- (In reply to Jakub Jelinek from comment #2) > Couldn't e.g. address space randomization of the instrumented binaries > (compiler itself) matter? I must confirm that the machine where I run it has ASLR

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 --- Comment #3 from Richard Biener --- (In reply to Jakub Jelinek from comment #2) > Couldn't e.g. address space randomization of the instrumented binaries > (compiler itself) matter? I bet some hash-tables could end up with different access

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #2

[Bug bootstrap/93398] PGO bootstrap is not reproducible

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93398 Martin Liška changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed|