On 11/11/13, 5:19 AM, Ingo Molnar wrote:
In what way is call-graph profiling utilized typically?
Is it system-wide, i.e. something like:
perf record -a -g sleep 10
? If yes then that would explain why scalability problems rarely surfaced,
it takes a longer user-space profile to get to the event counts where
scalability started hurting.
Both. But not time periods long enough to generate GB sized files
(limitations in the product). I get various reports of hung commands
(usually perf-not terminated properly (now fixed) or the file is
corrupted on transfer), but noone has complained to me about perf-report
appearing to hang or for 20-30 minutes to generate a result.
David
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