Re: SSD + RAID

Merlin Moncure <mmoncure@gmail.com>

From: Merlin Moncure <mmoncure@gmail.com>

To: Greg Smith <greg@2ndquadrant.com>

Cc: Scott Marlowe <scott.marlowe@gmail.com>, Scott Carey <scott@richrelevance.com>, "david@lang.hm" <david@lang.hm>, Brad Nicholson <bnichols@ca.afilias.info>, Karl Denninger <karl@denninger.net>, Laszlo Nagy <gandalf@shopzeus.com>, pgsql-performance <pgsql-performance@postgresql.org>

Date: 2009-11-19T21:39:18Z

Lists: pgsql-performance

On Thu, Nov 19, 2009 at 4:10 PM, Greg Smith <greg@2ndquadrant.com> wrote:
> You can use pgbench to either get interesting peak read results, or peak
> write ones, but it's not real useful for things in between.  The standard
> test basically turns into a huge stack of writes to a single table, and the
> select-only one is interesting to gauge either cached or uncached read speed
> (depending on the scale).  It's not very useful for getting a feel for how
> something with a mixed read/write workload does though, which is unfortunate
> because I think that scenario is much more common than what it does test.

all true, but it's pretty easy to rig custom (-f) commands for
virtually any test you want,.

merlin