> With regards to other jobs on the server, there is a MySQL server on it > as well, which from time to time has some multi-second queries generated > from a webserver also on this host, but the MySQL is running with nice > 10 (PostgreSQL isn't nice'd).
Do those MySQL queries hit disk hard? I've never seen PostgreSQL have hicups like you describe when running on a machine by itself. I have experienced similar issues when another process (cron job in my case) caused brief swapping to occur.
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