Need to find which processor is running a process

demosp · 11-06-2007, 06:50 AM

Hello guys,

I was wondering if there is a way to find which processor is running a specific process. I'm build a program with parallel processes and is really important to check this because I had a terrible slowdown when I executed the program on kernel 2.6.X in comparison with 2.4.X

Thnx in advance

matthewg42 · 11-06-2007, 07:37 AM

You can request the psr column in the output of ps, like this:

Code:

ps -e -o pid,psr,cmd

This will list all processes on the system.

sundialsvcs · 11-06-2007, 07:25 PM

If you had a "terrible slowdown," I'll guarantee 'ya that "which processor" has nothing to do with it.

Sorry.

syg00 · 11-06-2007, 07:34 PM

Maybe - maybe not. Rapid flip-flopping between processors can be expensive. The scheduler tries to avoid doing it, but it can happen.
I use cpusets to isolate workloads to particular CPU(s) when I need to - try that. I find it easier than trying to set up affinity in diverse applications.