Heikki Linnakangas wrote:
Greg Stark wrote:
On Fri, Aug 28, 2009 at 8:07 PM, Simon Riggs<si...@2ndquadrant.com> wrote:
WALInsertLock is heavily contended and likely always will be even if we
apply some of the planned fixes.
I've lost any earlier messages, could you resend the raw data on which
this is based?
I don't have any pointers right now, but WALInsertLock does often show
up as a bottleneck in write-intensive benchmarks.
yeah I recently ran accross that issue with testing concurrent COPY
performance:
http://www.kaltenbrunner.cc/blog/index.php?/archives/27-Benchmarking-8.4-Chapter-2bulk-loading.html
discussed here:
http://archives.postgresql.org/pgsql-hackers/2009-06/msg01019.php
and (iirc) also here:
http://archives.postgresql.org/pgsql-hackers/2009-06/msg01133.php
however the general issue is easily visible in almost any write
intensive concurrent workload on a fast IO subsystem(ie
pgbench,sysbench,...).
Stefan
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
