Daniel Haensse wrote:
Dear list,
I'm running postgres on a tomcat server. The vacuum is run every hour
(cronjob) which leads to a performance drop of the tomcat applications.
I played around with renice command and I think it is possible to reduce
this effect which a renice. The problem is how can I figure out the PID
of the postmaster performing the vacuum(automated)? Has anybody a nice
solution to change process priority? A shell script, maybe even for java?
While this may technically work, I think it lacks a key point. 'nice' ( at
least the versions I'm familiar with ) do not adjust I/O priority. VACUUM is
bogging things down because of the extra strain on I/O. CPU usage shouldn't
really be much of a factor.
Instead, I would recommend looking at vacuum_cost_delay and the related settings
to make vacuum lower priority than the queries you care about. This should be a
cleaner solution for you.
-Dan
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