On Tue, Jul 21, 2009 at 6:42 AM, Doug Hunley<doug@xxxxxxxxxxxxxxxxx> wrote: > Just wondering is the issue referenced in > http://archives.postgresql.org/pgsql-performance/2005-11/msg00415.php > is still present in 8.4 or if some tunable (or other) made the use of > hyperthreading a non-issue. We're looking to upgrade our servers soon > for performance reasons and am trying to determine if more cpus (no > HT) or less cpus (with HT) are the way to go. Thx This isn't really an application tunable so much as a kernel level tunable. PostgreSQL seems to have scaled pretty well a couple years ago in the tweakers.net benchmark of the Sun T1 CPU with 4 threads per core. However, at the time 4 AMD cores were spanking 8 Sun T1 cores with 4 threads each. Now, whether or not their benchmark applies to your application only you can say. Can you get machines on a 30 day trial program to benchmark them and decide which to go with? I'm guessing that dual 6core Opterons with lots of memory is the current king of the hill for reasonably priced pg servers that are running CPU bound loads. If you're mostly IO bound then it really doesn't matter which CPU. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
