--- On Mon, 11/4/11, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > From: Scott Marlowe <scott.marlowe@xxxxxxxxx> > Subject: Re: Linux: more cores = less concurrency. > To: "Glyn Astill" <glynastill@xxxxxxxxxxx> > Cc: "Kevin Grittner" <Kevin.Grittner@xxxxxxxxxxxx>, "Joshua D. Drake" <jd@xxxxxxxxxxxxxxxxx>, pgsql-performance@xxxxxxxxxxxxxx > Date: Monday, 11 April, 2011, 21:52 > On Mon, Apr 11, 2011 at 1:42 PM, Glyn > Astill <glynastill@xxxxxxxxxxx> > wrote: > > > A wild guess is something like multiple cores > contending for cpu cache, cpu affinity, or some kind of > contention in the kernel, alas a little out of my depth. > > > > It's pretty sickening to think I can't get anything > else out of more than 8 cores. > > Have you tried running the memory stream benchmark Greg > Smith had > posted here a while back? It'll let you know if > you're memory is > bottlenecking. Right now my 48 core machines are the > king of that > benchmark with something like 70+Gig a second. > No I haven't, but I will first thing tomorow morning. I did run a sysbench memory write test though, if I recall correctly that gave me somewhere just over 3000 Mb/s -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
