My OS is RHEL7 and my perf version is:
perf version 3.10.0-514.16.1.el7.x86_64.debug
My application bonds some threads with dedicated CPUs (1-13,15-27,31-41,43-55). During its running, I use “perf top” to observe these dedicated CPUs:
$ sudo perf top -C 1-13,15-27,31-41,43-55
At the same time, if I use “perf record” to sample the whole process:
$ sudo perf record -g -p 22530
“perf record” can’t sample threads running on CPUs monitored by “perf top“. So please be cautious when using “perf top” and “perf record” simultaneously.