pgstat wait timeout

Hi,

I am having a scenario where I get consistent warnings in the pglog folder:

2011-12-11 00:00:03 JST WARNING: pgstat wait timeout
2011-12-11 00:00:14 JST WARNING: pgstat wait timeout
2011-12-11 00:00:24 JST WARNING: pgstat wait timeout
2011-12-11 00:00:31 JST WARNING: pgstat wait timeout
2011-12-11 00:00:44 JST WARNING: pgstat wait timeout
2011-12-11 00:00:52 JST WARNING: pgstat wait timeout
2011-12-11 00:01:03 JST WARNING: pgstat wait timeout
2011-12-11 00:01:11 JST WARNING: pgstat wait timeout
.
.
.

This is impacting database performance.

The issue persists even when I use the database minimally.

I have tried fine-tuning the Auto-vacuum parameters:

Change the parameter autovacuum_vacuum_cost_delay to 40ms ::: Issue is
reproduced 4 hours after this change

Change the parameter autovacuum_max_workers to 20 ::: I got the warning
message 2 times at times 17:20:12 and 17:20:20. After this, no warnings for
5 hours. Then I tried:

Change the parameter autovacuum_vacuum_cost_delay to: 60ms, Change the
parameter autovacuum_max_workers to: 10::: I got the warning message 2 times
at times 17:20:12 and 17:20:20. After this, no warnings for 5 hours

Any Ideas?

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