Robert Lor <Robert(dot)Lor(at)Sun(dot)COM> writes:
> Here is the break down between exclusive & shared LWLocks. Do the
> numbers look reasonable to you?
Yeah, those seem plausible, although the hold time for
CheckpointStartLock seems awfully high --- about 20 msec
per transaction. Are you using a nonzero commit_delay?
regards, tom lane