| From: | Ants Aasma <ants(at)cybertec(dot)at> |
|---|---|
| To: | Ants Aasma <ants(at)cybertec(dot)at> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Magnus Hagander <magnus(at)hagander(dot)net> |
| Subject: | Re: Further pg_upgrade analysis for many tables |
| Date: | 2012-11-09 06:20:59 |
| Message-ID: | CA+CSw_s=u5NFrhyWxvGpX2yw=d-kGQdXGSDBXMpZpb=se4ENFw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Nov 9, 2012 at 7:53 AM, Ants Aasma <ants(at)cybertec(dot)at> wrote:
> I also took two profiles (attached). AtEOXact_RelationCache seems to
> be the culprit for the quadratic growth.
One more thing that jumps out as quadratic from the profiles is
transfer_all_new_dbs from pg_upgrade (20% of total CPU time at 64k).
Searching for non-primary files loops over the whole file list for
each relation. This would be a lot faster if we would sort the file
list first and use binary search to find the related files.
Ants Aasma
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