HI all... On 03.08, Andrew Morton wrote: > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11/2.6.11-mm2/ >
(replied to this because this is the kernel I am testing on :) ) Can cpu affinity really be changed for a running process ? Does it need something like io or yielding to take effect ? I am playin with Robert Love's taskset (symlinked to runon, it is easier to type and I'm more used to it), because I want to play with hyperthreading and wanted a method to force two threads on the same physical package. It works fine to bound a new process to a cpu set, but I does not change anything for a running process. I try runon -c -p 0 <pid> for my numbercruncher and it does nothing, top shows it is in the same cpus where it started: werewolf:~# runon -c -p 0 8277 pid 8277's current affinity list: 0-3 pid 8277's new affinity list: 0 werewolf:~# runon -c -p 8277 pid 8277's current affinity list: 0 The program uses posix threads, 2 in this case. The two threads change from cpu sometimes (not too often), but do not go into the same processor immediately as when I start the program directly with runon/taskset. Any idea ? TIA -- J.A. Magallon <jamagallon()able!es> \ Software is like sex: werewolf!able!es \ It's better when it's free Mandrakelinux release 10.2 (Cooker) for i586 Linux 2.6.11-jam3 (gcc 3.4.3 (Mandrakelinux 10.2 3.4.3-3mdk)) #1 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
