Re: PostgreSQL7.1 on AIX5L is running with too poor ferformance

> "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?

I think yes. I have compiled 7.1 on an AIX5L box and found that TAS()
was replaced by:

cs((int *) (lock), 0, 1)

> 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.
--
Tatsuo Ishii