Stefan Kaltenbrunner <stefan@kaltenbrunner.cc> writes:
> heh no log archiving - I actually said that I'm now playing with
> --truncate-before-load which seems to cause a noticeable performance (as
> in IO generated) increase but I still see >130000 context switches/s and
> a profile that looks like:
> samples % symbol name
> 55526 16.5614 LWLockAcquire
> 29721 8.8647 DoCopy
> 26581 7.9281 CopyReadLine
> 25105 7.4879 LWLockRelease
> 15743 4.6956 PinBuffer
> 14725 4.3919 heap_formtuple
Still a lot of contention for something, then. You might try turning on
LWLOCK_STATS (this only requires recompiling storage/lmgr/lwlock.c) to
get some evidence about what.
regards, tom lane