2014-02-23 21:32 GMT+01:00 Andres Freund <and...@2ndquadrant.com>: > Hi, > > On 2014-02-23 20:04:39 +0100, Pavel Stehule wrote: > > There is relative few very long ProcArrayLocks lwlocks > > > > This issue is very pathologic on fast computers with more than 8 CPU. > This > > issue was detected after migration from 8.4 to 9.2. (but tested with same > > result on 9.0) I see it on devel 9.4 today actualized. > > > > When I moved PREPARE from cycle, then described issues is gone. But when > I > > use a EXECUTE IMMEDIATELY, then the issue is back. So it looks it is > > related to planner, ... > > In addition to the issue Jeff mentioned, I'd suggest trying the same > workload with repeatable read. That can do *wonders* because of the > reduced number of snapshots. > > I tested it, and it doesn't help.
Is there some patch, that I can test related to this issue? > Greetings, > > Andres Freund > > -- > Andres Freund http://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Training & Services >