Re: performance tuning: shared_buffers, sort_mem; swap

Thomas O'Connell wrote:
> so a while back, i think i recall a post from Bruce Momjian describing
> an optimum setup for shared_buffers at 25% of available physical memory
> and sort_mem at 4% of available physical memory.

Yes, that was the numebers to start with.

> the caveat was to watch for swap activity when these values were being
> set. so my question is, how much swapping is too much, and is there a
> way to determine whether postgres is the process causing the swapping?

Well, it doesn't really matter who is causing the swapping.  If you have
more of a load on your machine that RAM can hold, you are better off
reducing your PostgreSQL shared buffers.

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