Messages in this thread | | | Date | Mon, 11 Nov 2013 07:44:37 -0700 | From | David Ahern <> | Subject | Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate hist periods (v2) |
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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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