Darcy, Chris,

FWIW, I'm looking at their system now and am seeing persistent lock contention 
on pg_listener:

 relation | database  | transaction |  pid  |     mode      | granted
----------+-----------+-------------+-------+---------------+---------
    16414 | 318624738 |             | 18883 | ExclusiveLock | f
    16414 | 318624738 |             | 19028 | ExclusiveLock | f
    16414 | 318624738 |             | 19205 | ExclusiveLock | t


This lock contention seems constant.       Why would pg_listener be having 
blocking exclusive locks?

--Josh

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