On Fri, Jul 22, 2011 at 10:15:08PM -0400, Greg Smith wrote: > On 07/22/2011 08:15 PM, David Fetter wrote: > >Do you have any theories as to how indexing on SSD speeds things > >up? IIRC you found only marginal benefit in putting WALs there. > >Are there cases that SSD helps more than others when it comes to > >indexing? > > Yes, I've found a variety of workloads where using a SSD turns out > to be slower than the old-school array of drives with a > battery-backed write cache. Tiny commits are slower, sequential > writes can easily be slower, and if there isn't a random I/O > component to the job the SSD won't get any way to make up for that.
So you're saying this is more of a flash thing than an SSD thing? I haven't heard of systems with PCM having this limitation. Cheers, David. -- David Fetter <da...@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com iCal: webcal://www.tripit.com/feed/ical/people/david74/tripit.ics Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
