| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: checkpointer continuous flushing |
| Date: | 2016-01-12 12:20:36 |
| Message-ID: | CAA4eK1KnU0tF0dKT52qg9SJ7GwEijLt=XZj7ebhQKqA523mjRw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jan 12, 2016 at 12:57 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:>
>
> My theory is that this happens due to the sorting: pgbench is an update
> heavy workload, the first few pages are always going to be used if
> there's free space as freespacemap.c essentially prefers those. Due to
> the sorting all a relation's early pages are going to be in "in a row".
>
Not sure, what is best way to tackle this problem, but I think one way could
be to perform sorting at flush requests level rather than before writing
to OS buffers.
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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