> I think you are probably looking at the same problem previously reported
> by Josh Berkus among others.  Does the rate of context swaps shown by
> vmstat go through the roof when this happens?  If you strace or ktrace
> one of the backends, do you see lots of semop()s and little else?

That would be interesting.   Previously we've only demonstrated the problem on 
long-running queries, but I suppose it could also affect massive concurrent 
query access.

Josh Berkus
Aglio Database Solutions
San Francisco

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