Re: Novice needs tuning help!

In article <3572124d.141336500@news>, David Kosenko <dkosenko@monmouth.com> writes >Also sprach David Williams <djw@smooth1.demon.co.uk> : >: Is this a single cpu machine? How fast is the cpu? >: Also if NUMCPUVPS=1 set SINGLE_CPU_VP to 1. >: >:NOAGE 0 # Process aging >: >: Try setting this to 1 >: >:AFF_SPROC 0 # Affinity start processor >:AFF_NPROCS 0 # Affinity number of processors >: >: Try setting these to 1 and 1 so it is pinned on the cpu. > > >Just out of curiosity: what possible benefit would you expect to derive in >setting affinity on in a single cpu system? There's no other processor for the >process to migrate to! Correct, but it's make sure that the OS takes this into account. i.e. NOT flushing the MMU mappings as often. It is another hint to the OS since you do not often get multi-CPU OS's like modern unix behaving differently with one CPU. They work the same regardless of the number of CPUs. Not one way for a single cpu and another way for 2-N cpus, hence you have to give them hints!! > >Dave > >Dave (posting from home, speaking as a representative of nobody but himself) >********** >"Everybody plays the fool, sometimes." -- David Williams Maintainer of the Informix FAQ Primary site (Beta Version) http://www.smooth1.demon.co.uk Official site http://www.iiug.org/techinfo/faq/faq_top.html I see you standin', Standin' on your own, It's such a lonely place for you, For you to be If you need a shoulder, Or if you need a friend, I'll be here standing, Until the bitter end... So don't chastise me Or think I, I mean you harm... All I ever wanted Was for you To know that I care