High-frequency performance counter sampling using perf record/report
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I want to retrieve performance counter counts at a high frequency (i.e. 100-200Hz) using the
perf
tool (similar in functionality to https://github.com/RRZE-HPC/likwid/wiki/likwid-perfctr#the-timeline-mode but at a higher frequency). Is there a way to do this? If so, what flags do I need to use when recording with perf record
and reporting results with perf report
?
So far, I've tried the following to retrieve the r6d70 performance counter at 5ms intervals during sleep 5
execution: sudo perf record -F200 -e r6d70 -a sleep 5
. However, when I use perf report
to view the outputted data, I see the following, which isn't really what I want:
Samples: 109 of event 'r6d70', Event count (approx.): 68432
Overhead Command Shared Object Symbol
33.77% swapper [kernel.kallsyms] [k] update_blocked_averages
10.30% node [kernel.kallsyms] [k] update_blocked_averages
9.07% containerd [kernel.kallsyms] [k] update_load_avg
8.98% containerd [kernel.kallsyms] [k] __switch_to
8.56% node node [.] Builtins_LdaNamedPropertyHandler
5.90% swapper [kernel.kallsyms] [k] __sched_text_start
5.88% swapper [kernel.kallsyms] [k] cpufreq_this_cpu_can_update
5.81% nautilus [kernel.kallsyms] [k] update_blocked_averages
4.56% node node [.] v8::platform::tracing::TracingController
3.82% swapper [kernel.kallsyms] [k] arch_irq_work_raise
3.20% containerd [kernel.kallsyms] [k] select_task_rq_fair
0.03% swapper [kernel.kallsyms] [k] acpi_idle_do_entry
Asked by Justin Borromeo
(121 rep)
Mar 8, 2020, 07:55 AM