Re: ProcArrayLock (The Saga continues)

"Jignesh K. Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM> writes:

> Note with this no think time concept, each clients can be about 75% CPU busy
> from what I observed. running it I found the clients scaling up saturates at
> about 60 now (compared to 500 from the original test). The peak throughput was
> at about 50 users (using synchrnous_commit=off)

So to get the maximum throughput on the benchmark with think times you want to
aggregate the clients about 10:1 with a connection pooler or some middleware
layer of some kind, it seems.

It's still interesting to find the choke points for large numbers of
connections. But I think not because it's limiting your benchmark results --
that would be better addressed by using fewer connections -- just for the sake
of knowing where problems loom on the horizon.

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Ask me about EnterpriseDB's PostGIS support!