On Tue, Jun 13, 2006 at 04:20:34PM -0700, Mischa Sandberg wrote: > Jim C. Nasby wrote: > >On Tue, Jun 13, 2006 at 03:21:34PM -0700, Mischa Sandberg wrote: > >>Raised shared_buffers to 16000 (128MB). > >>DB server dropped to a CRAWL. > >> > >>vmstat showed that it was swapping like crazy. > >>Dropped shared_buffers back down again. > >>Swapping stopped. > > > >What's sort_mem set to? I suspect you simply ran the machine out of > >memory. > > 8192 (8MB). No issue when shared_buffers was 2000; same apps always. So if all 50 backends were running a sort, you'd use 400MB. The box has 4G, right? > >Also, Solaris by default will only use a portion of memory for > >filesystem caching, which will kill PostgreSQL performance. > > Yep, tested /etc/system segmap_percent at 20,40,60. > No significant difference between 20 and 60. That's pretty disturbing... how large is your database? -- Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
