Hi Vladimir,

Thanks for these reports.

On 2016-06-13 00:42:19 +0300, Vladimir Borodin wrote:
> perf report -g -i pg9?_all.data >/tmp/pg9?_perf_report.txt

Any chance you could redo the reports with --no-children --call-graph=fractal
added? The mode that includes child overheads unfortunately makes the
output hard to interpet/compare.

> The results from pg9?_perf_report.txt are attached. Note that in all cases 
> some events were lost, i.e.:
> root@pgload05g ~ # perf report -g -i pg94_all.data >/tmp/pg94_perf_report.txt
> Failed to open [vsyscall], continuing without symbols
> Warning:
> Processed 537137 events and lost 7846 chunks!

You can reduce the overhead by reducing the sampling frequency, e.g. by
specifying -F 300.


Andres Freund

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