Re: Performance comparison between Pgsql 10.5 and Pgsql 11.2

From: Nicola Contu <nicola(dot)contu(at)gmail(dot)com>
To: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Ray O'Donnell" <ray(at)rodonnell(dot)ie>, "pgsql-generallists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>, Alessandro Aste <Alessandro(dot)aste(at)gtt(dot)net>
Subject: Re: Performance comparison between Pgsql 10.5 and Pgsql 11.2
Date: 2019-03-06 10:14:45
Message-ID: CAMTZZh347xA_MsP53rKZA2xcLA=4QKX=XAfkEsRsvtnWFS3egQ@mail.gmail.com
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Here is the strace as requested for pg11

Thanks

Il giorno mar 5 mar 2019 alle ore 17:47 Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
ha scritto:

> On Wed, Mar 6, 2019 at 4:22 AM Nicola Contu <nicola(dot)contu(at)gmail(dot)com>
> wrote:
> >
> > Not sure what you are requesting exactly but here is the strace for the
> start of the pg_ctl
>
> I meant that you could run the server itself in the foreground under
> strace, like so:
>
> $ strace -f -c /usr/local/pgsql11.2/bin/postgres -D /db/pgsql11/data/
>
> Then perform your testing, and finally stop it with pg_ctl from
> another window (or hit ^C in this window) and strace should spit out a
> table of system calls with some counters. We might be able to see why
> v11 is spending so much more time executing system calls than v10 for
> your workload, or at least which systems calls they are, assuming you
> run the same transactions against both versions.
>
> --
> Thomas Munro
> https://enterprisedb.com
>

Attachment Content-Type Size
strace_direct.txt text/plain 8.7 KB

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