"Leslie" <leslie(at)boreas(dot)dti(dot)ne(dot)jp> writes:
> PostgreSQL7.1 is now running on AIX5L( S85, 6GB memory, 6CPU), which was
> running on Linux before(Pentium3, 2CPU, as far as I
> remember.......sorry......).
> The performance( on AIX5L ) is just half as good as the one( on Linux ).
Hmm ... is the AIX compilation selecting an appropriate TAS
implementation for spinlocks? If it's falling back to semaphore-based
spinlocks, I can easily believe that you might take a 2X performance
hit. Possibly s_lock.h needs some additional #if tests for AIX5.
regards, tom lane