Workload slows down for default sampling cycles in KNL. There are some processing in perf that's single threaded and bottlenecked when number of cores really go up.
A second issue is that things slow down when we issue
perf record – workload
vs
perf record -a – workload
Description:
Workload slows down for default sampling cycles in KNL. There are some processing in perf that's single threaded and bottlenecked when number of cores really go up.
A second issue is that things slow down when we issue
perf record – workload
vs
perf record -a – workload
Patch is submitted for review
https:/ /www.spinics. net/lists/ kernel/ msg2552460. html /www.spinics. net/lists/ kernel/ msg2552461. html /www.spinics. net/lists/ kernel/ msg2552462. html /www.spinics. net/lists/ kernel/ msg2552463. html
https:/
https:/
https:/
Target kernel: TBD
Target Release: 18.04