Tom Lane wrote:

> I noticed today on my own machine several strange pauses while running
> the serial regression tests --- the machine didn't seem to be hitting
> the disk nor sucking lots of CPU, it just sat there for several seconds
> and then picked up again.  I wonder if that's related.  It sure seems it
> must be due to autovac being on now.

The only pauses I see are are in the "stats" and the "prepared_xacts"
tests.  The latter is due to a test that uses statement_timeout to
detect a lock, and the stat test does a pg_sleep(2.0) call.

Do those explain what you are seeing?

Alvaro Herrera                      
The PostgreSQL Company - Command Prompt, Inc.

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