| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | Jakub Wartak <Jakub(dot)Wartak(at)tomtom(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Handing off SLRU fsyncs to the checkpointer |
| Date: | 2020-08-26 05:20:59 |
| Message-ID: | 20200826052059.hvscf7ndf7g4673q@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2020-08-26 15:58:14 +1200, Thomas Munro wrote:
> > --12.51%--compactify_tuples
> > PageRepairFragmentation
> > heap2_redo
> > StartupXLOG
>
> I wonder if there is something higher level that could be done to
> reduce the amount of compaction work required in the first place, but
> in the meantime I'm very happy if we can improve the situation so much
> with such a microscopic improvement that might eventually benefit
> other sorting stuff...
Another approach could be to not perform any sorting during recovery,
instead including enough information in the WAL record to avoid doing a
full blown PageRepairFragmentation during recovery.
Greetings,
Andres Freund
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