From: Michel SALAIS <msalais@msym.fr>
To: 'Tom Lane' <tgl@sss.pgh.pa.us>
Cc: 'Julien Rouhaud' <rjuju123@gmail.com>
Cc: 'postgres performance list' <pgsql-performance@postgresql.org>
Subject: RE: sql execution time in pg_stat_statements
Date: Sun, 19 Sep 2021 17:41:48 +0200
Message-ID: <000001d7ad6c$dc44d250$94ce76f0$@msym.fr> (raw)
In-Reply-To: <4078764.1631295728@sss.pgh.pa.us>
References: <005f01d7a5a6$67784b50$3668e1f0$@msym.fr>
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<007201d7a667$1516d860$3f448920$@msym.fr>
<4078764.1631295728@sss.pgh.pa.us>
Hi Tom,
I was out of this list for a while.
Unfortunately, I have now no access to the server where I have seen this.
Best regards
Michel SALAIS
-----Message d'origine-----
De : Tom Lane <tgl@sss.pgh.pa.us>
Envoyé : vendredi 10 septembre 2021 19:42
À : Michel SALAIS <msalais@msym.fr>
Cc : 'Julien Rouhaud' <rjuju123@gmail.com>; 'postgres performance list'
<pgsql-performance@postgresql.org>
Objet : Re: sql execution time in pg_stat_statements
"Michel SALAIS" <msalais@msym.fr> writes:
> I thaught that total_time (total_exec_time + total_plan_time) included I/O
but when we have blk_read_time + blk_write_time equals several times
total_time it is difficult to continue to think that...
That's an interesting report, but on the whole I'd be more inclined to
disbelieve the I/O timings than the overall time. Can you create a
reproducible test case where this happens? Also, exactly what PG version
and pg_stat_statements version are you using?
regards, tom lane
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Cc: msalais@msym.fr, tgl@sss.pgh.pa.us, rjuju123@gmail.com
Subject: RE: sql execution time in pg_stat_statements
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