Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate histperiods (v2)

[David Ahern]

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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