| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Vladimir Borodin <root(at)simply(dot)name> |
| Cc: | Антон Бушмелев <bushmelev(dot)aa(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PERFORM] 9.4 -> 9.5 regression with queries through pgbouncer on RHEL 6 |
| Date: | 2016-06-12 21:51:40 |
| Message-ID: | 20160612215140.znmnl4mpzvgxjmgn@alap3.anarazel.de |
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| Lists: | pgsql-hackers pgsql-performance |
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(at)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.
Greetings,
Andres Freund
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