On Sun, 2 Mar 2008, Julian Elischer wrote:
Peter Jeremy wrote:
Kris has done some excellent benchmarking as usual. Here you can see the
improvement in postgres depending on various scheduler debug settings:
http://people.freebsd.org/~kris/scaling/pgsql-16cpu.png
The improvement is quite substantial. Congratulations Jeff.
the drop off after 14 is intersting..
It's contention on various kernel locks, most likely the proc lock.
Scheduling algorithms which limit concurrency at contention can improve
throughput in these cases but it is to the detriment of workloads which do
not suffer the same contention. The ultimate solution will be to improve
proc/sleepq/signal locking for 8.0.
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