I wrote:
> The following proposal should improve performance substantially when
> there is contention for a lock, but it creates no portability risks
> ...
I have committed changes to implement this proposal. I'm not seeing
any significant performance difference on pgbench on my single-CPU
system ... but pgbench is I/O bound anyway on this hardware, so that's
not very surprising. I'll be interested to see what other people
observe. (Tatsuo, care to rerun that 1000-client test?)
regards, tom lane