On Dec 26, 2007 12:21 PM, Simon Riggs <simon@xxxxxxxxxxxxxxx> wrote: > bgwriter_lru_maxpages = 0 > > So we can see if the bgwriter has any hand in this? It doesn't change the behaviour I have. It's not checkpointing either as using pgbench-tools, I can see that tps and latency are quite stable during the entire run. Btw, thanks Greg for these nice tools. I thought it may be some sort of lock contention so I made a few tests with -N but I have the same behaviour. Then I decided to perform read-only tests using -S option (pgbench -S -s 100 -c 16 -t 30000 -U postgres bench). And still the same behaviour: shared_buffers=64MB : 20k tps shared_buffers=1024MB : 8k tps Any other idea? -- Guillaume ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
