https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234325
Bug ID: 234325
Summary: pmcstat seems to be broken in sampling mode (at least
on amd hardware)
Product: Base System
Version: 12.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: shamaz.ma...@gmail.com
Hello. I use FreeBSD 12.0-RELEASE on two machines (one with Ryzen 5 1600X
processor and the other with FX-6300).
Recently (presumable after upgrading to 12.0-RELEASE) pmcstat stopped working
in sample mode.
I run it as:
`pmcstat -P instructions -O test.out -n 65536 ./noisecpu` on FX-6300
or
`pmcstat -P ex_ret_instr -O test.out -n 65536 ./noisecpu` on Ryzen
and then I run `pmcstat -R test.out -g`
In both cases it creates directories (e.g. ex_ret_instr) which are either empty
or containing only kernel.gmon
`noisecpu` is computation heavy program, calculating value noise on a large
grid and works for ~8 seconds.
Conversion statistics usually looks like following:
#exec/elf 1
#samples/total 169
#samples/unclaimed 165
#callchain/dubious-frames 165
In counting mode (with -p argument) everything seems to be working. Can anybody
confirm this?
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