But CPU affinity isn't realated to hyperthreading, as far as I know. CPU affinity tries to keep processes on the same cpu in case there is still valuable info in the cpu cache.
--------------------------------------------------------------------------- Jord Tanner wrote: > The Linux 2.6 kernel will have the ability to set CPU affinity for > specific processes. There is a patch for the 2.4 kernel at > http://www.kernel.org/pub/linux/kernel/people/rml/cpu-affinity > > RedHat 9 already has support for CPU affinity build in. > > The July 2003 issue of Linux Journal includes a little C program (on > page 20) that gives you a shell level interface to the CPU affinity > system calls, so you can dynamically assign processes to specific CPUs. > I haven't tried it, but it looks very cool (my only SMP machine is in > production, and I don't want to mess with it). If you try it out, please > share your experiences with the list. > > > Jord Tanner > Independent Gecko Consultants > > On Tue, 2003-07-22 at 10:10, SZUCS G?bor wrote: > > "by default" -- do you mean there is a way to tell Linux to favor the second > > real cpu over the HT one? how? > > > > G. > > ------------------------------- cut here ------------------------------- > > ----- Original Message ----- > > From: "Bruce Momjian" <[EMAIL PROTECTED]> > > Sent: Tuesday, July 22, 2003 6:26 PM > > Subject: Re: [PERFORM] Dual Xeon + HW RAID question > > > > > > > Right, I simplified it. The big deal is whether the OS favors the > > > second real CPU over one of the virtual CPU's on the same die --- by > > > default, it doesn't. Ever if it did work perfectly, you are talking > > > about going from 1 to 1.4 or 2 to 2.8, which doesn't seem like much. > > > > > > ---------------------------(end of broadcast)--------------------------- > > TIP 8: explain analyze is your friend > -- > Jord Tanner <[EMAIL PROTECTED]> > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to [EMAIL PROTECTED] so that your > message can get through to the mailing list cleanly > -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
