| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: CLUSTER, reform_and_rewrite_tuple(), and parallelism |
| Date: | 2016-08-18 00:15:29 |
| Message-ID: | 20160818001529.tpvrupsfe6gh5dvx@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2016-08-17 16:58:49 -0700, Peter Geoghegan wrote:
> On Wed, Aug 17, 2016 at 4:28 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > Could you also provide a strace -ttt -T -c and a cpu cycles flamegraph?
>
> Here is the output from that strace invocation, plus a -p (to attach
> to the relevant backend):
>
> strace: -t has no effect with -c
> strace: -T has no effect with -c
Ugh, swapped -c and -C, sorry.
> This doesn't seem that interesting, but not sure what you're looking for.
I'd like to know the amount of time spent in various syscalls, and how
much that varies.
> I also attach cycles flamegraph.
Thanks.
Andres
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