On 20.09.2011 10:48, Simon Riggs wrote:
On Fri, Sep 16, 2011 at 2:38 AM, Fujii Masao<masao.fu...@gmail.com> wrote:
On Fri, Sep 16, 2011 at 7:53 AM, Simon Riggs<si...@2ndquadrant.com> wrote:
This patch splits bgwriter into 2 processes: checkpointer and
bgwriter, seeking to avoid contentious changes. Additional changes are
expected in this release to build upon these changes for both new
processes, though this patch stands on its own as both a performance
vehicle and in some ways a refcatoring to simplify the code.
I like this idea to simplify the code. How much performance gain can we
expect by this patch?
On heavily I/O bound systems, this is likely to make a noticeable
difference, since bgwriter reduces I/O in user processes.
Hmm. If the system is I/O bound, it doesn't matter which process
performs the I/O. It's still the same amount of I/O in total, and in an
I/O bound system, that's what determines the overall throughput.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
