disabling processors

snasto · 06-08-2012, 11:46 AM

how can I disable processors on a 2 socket/ 4 dual cores each = 16 processors total on RHLE 5.8 server?

suicidaleggroll · 06-08-2012, 11:47 AM

Usually the BIOS will have a setting to limit the number of active cores on a proc.

em31amit · 06-08-2012, 01:46 PM

To disable processor in rhel5 you can use something like this.

Code:

# grep "processor" /proc/cpuinfo
 processor       : 0
 processor       : 1

In order to disable CPU 1, write 0 to /sys/devices/system/cpu/cpu1/online:

Code:

# echo 0 > /sys/devices/system/cpu/cpu1/online

Check /proc/cpuinfo to see if the CPU is disabled:

Code:

# grep "processor" /proc/cpuinfo
processor       : 0

Notice that there is now only one processor shown (CPU 0) instead of two.

also you can edit grub.conf and pass this "maxcpus=1" to kernel while booting