Re: Partitioned checkpointing

Fabien,

Thanks for your comment.
I'll check them and try to examine what is the same and what is different.
--
Takashi Horikawa
NEC Corporation
Knowledge Discovery Research Laboratories


> -----Original Message-----
> From: pgsql-hackers-owner@postgresql.org
> [mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Fabien COELHO
> Sent: Thursday, September 10, 2015 7:33 PM
> To: Horikawa Takashi(堀川 隆)
> Cc: pgsql-hackers@postgresql.org
> Subject: Re: [HACKERS] Partitioned checkpointing
> 
> 
> 
> > I don't feel that another source of the performance dip has been
> > heartily addressed; full-page-write rush, which I call here, would be
> a major issue.
> > That is, the average size of transaction log (XLOG) records jumps up
> > sharply immediately after the beginning of each checkpoint, resulting
> > in the saturation of WAL write path including disk(s) for
> > $PGDATA/pg_xlog and WAL buffers.
> 
> On this point, you may have a look at this item:
> 
>      https://commitfest.postgresql.org/5/283/
> 
> --
> Fabien.
> 
> 
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