Josh Rovero <rovero(at)sonalysts(dot)com> writes:
> There is still a average 9% improvement in 7.4b2
> transaction rates over 7.3.4. For low number
> of clients (1 - 3) performance was almost the
> same. For higher numbers of clients, the 7.4
> advantage was often in the 15-25% range.
This seems more believable as a version-to-version improvement factor.
I suspect that your previous numbers reflect some isolated tweak that
we made in the lock management code, that happened to reduce the amount
of time wasted in a heavy-contention scenario. Not sure what though...
regards, tom lane