Re: CPUVPs and Affinity
In article <6uo97h$4rs$1@news.xmission.com>, Nigel Gall <nigelg@ppsl.com> writes > >Hi! > >I've been reading the threads on the ratio of CPUVPs to physical CPUs. > >I have a new server with three CPUs. I'd like to start off with two >CPUVPs and use affinity to bind them to the 2nd and 3rd CPU. Over time, >I'd like to try increasing the number of CPUVPs and examine the >performance impact. > >Will I be able to affinitize (if there's such a word) the additional >CPUVPs to the same two CPUs above? I want to test the theory that Not using Online $ONCONFIG parameters as it defines a start CPU number and a number of CPUS. You should be able to manually using an OS command (try 'man pbind'). Affinity means this process will ONLY run on this CPU. It does NOT mean this CPU will run ONLY this process. I don't see much benefit and some slow down since the CPU caches will probably be too small to hold the working sets of two CPU VPs + UNIX overhead. >having more CPUVPs means having greater timeslices in the UNIX queue >which may lead to greater CPU utilization and better performance. I'd >also like to keep the CPUVPs running only on the these two CPUs, thereby >leaving the first CPU for UNIX processing. > >Best regards, >Nigel >+-------------------------------------------------------------+ >|Name : Edmund Nigel Gall Tel: (868) 636 3153 | >|Title : Information Systems Specialist Fax: (868) 679 3770 | >|Company: Process Plant Services Limited | >|Address: Atlantic Avenue, Point Lisas Industrial Estate | >| Point Lisas, Couva, Trinidad & Tobago, W.I. | >+----- mailto:nigelg@ppsl.com ------ http://www.ppsl.com -----+ > -- 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