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.
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.
Default is 10%? 12%? Can't recall.
Was not changed from 20 during the shared_buffer test.
--
Engineers think that equations approximate reality.
Physicists think that reality approximates the equations.
Mathematicians never make the connection.
