Horton

Re: Proposed patch: Smooth replication during VACUUM FULL

Greg Stark <gsstark@mit.edu>

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From: Greg Stark <gsstark@mit.edu>
To: Simon Riggs <simon@2ndquadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Jaime Casanova <jaime@2ndquadrant.com>, Gabriele Bartolini <gabriele.bartolini@2ndquadrant.it>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-05-02T06:44:39Z
Lists: pgsql-hackers 
On Sun, May 1, 2011 at 9:31 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
> I don't think the performance of replication is at issue. This is
> about resource control.
>

The unspoken question here is why would replication be affected by i/o
load anyways? It's reading data file buffers that have only recently
been written and should be in cache. I wonder if this system has
chosen O_DIRECT or something like that for writing out wal?

-- 
greg