[Bug gcov-profile/89307] -fprofile-generate binary may be too slow in multithreaded environment due to cache-line conflicts on counters

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89307

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
> 
> which effectively updates edge counters just for a limited time. I would
> expect

Ah now, it's really doing sampling. I guess it can lead to quite some profile
inconsistencies..