Shell Programming and Scripting

Hi all,

Using shell script, how to assign tasks to individual processors in a multicore processor ? For example: If I have 4 processors, I want to give one job to each of the processors. (When I give multiple jobs, it's assigning all the load to a single processor. )

Thanks
R

Processor affinity configuration is specific to each OS. If you tell us which specific OS and version and hardware you are using, we may be able to help you.

I am using CentOS linux and with "uname -a", here is the info of my machine:

******
Linux 2.6.18-92.1.6.el5PAE #1 SMP Wed Jun 25 14:21:46 EDT 2008 i686 i686 i386 GNU/Linux
******

and one of the processor info from /proc/cpuinfo is

*********
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU X5355 @ 2.66GHz
stepping : 11
cpu MHz : 2660.134
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monito
r ds_cpl vmx est tm2 cx16 xtpr lahf_lm
*******

Thanks
R

Nice !....Simple and straight to the point...

Thanks...I will try and see...

Ravi

Just thought that I'll post the solution that I found for anyone who is interested.

The command to assign tasks to individual processors in a multicore processor Is:

taskset -c -p <processor number> <PID>

For example, if I have 4 processors and I want to assign PID 1234 to processor number 2, I would write:

taskset -c -p 2 1234

The -c option is to indicate the numerical processor number rather than a bitmask. The -p option is specify not to open a new task and do it on the existing one.

Hope this helps.