On Fri, Apr 11, 2014 at 10:28 AM, Andres Freund <and...@2ndquadrant.com> wrote: > VACUUM sometimes waits synchronously for a cleanup lock on a heap > page. Sometimes for a long time. Without reporting it externally. > Rather confusing ;). > > Since we only take cleanup locks around vacuum, how about we report at > least in pgstat that we're waiting? At the moment, there's really no way > to know if that's what's happening.
That seems like a pretty good idea to me. I think we've avoided doing this for LWLocks for fear that there might be too much overhead, but it's hard for me to imagine a workload where you're waiting for cleanup locks often enough for the overhead to matter. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
