Cok guzel icerikler ve Tipler yollayabiliyorlar.
Ornegin bugun cok begendigim bir trick yollamislar. Paylasiyorum:
Problem
You want to dynamically enable or disable a CPU on a running system.
Solution
Red Hat Enterprise Linux 5 supports the cpu-hotplug mechanism, which allows for CPUs to be dynamically disabled and re-enabled on a system without requiring a system reboot.
In order to disable a CPU core in a running machine, use the file /sys/devices/system/cpu/cpuX/online.
The following command will disable a CPU:
# echo 0 > /sys/devices/system/cpu/cpuX/online
Where X is the ID of the CPU as determined from /proc/cpuinfo.
To re-enable the CPU, run:
# echo 1 > /sys/devices/system/cpu/cpuX/online
Example:
The following output from /proc/cpuinfo shows two processors on a system:
root@xen # grep "processor" /proc/cpuinfo
processor : 0
processor : 1
In order to disable CPU 1, echo "0" to /sys/devices/system/cpu/cpu1/online:
root@xen# echo 0 > /sys/devices/system/cpu/cpu1/online
cpu0/ cpu1/
Check /proc/cpuinfo to see if the cpu is disabled .
root@xen # grep "processor" /proc/cpuinfo
processor : 0
Notice that there is now only one processor shown (CPU 0) instead of two.
Note: There are some architectures in which a CPU cannot be disabled due to a dependency on a certain CPU. In such cases you will notice that the /sys/devices/system/cpu/cpuN/online file is missing.
For further details on CPU hotplugging, see this file:
/usr/share/doc/kernel-doc-2.6.18/Documentation/cpu-hotplug.txt
The documentation files are in the kernel-doc package, which can be installed from RHN.
Alinti: http://kbase.redhat.com/faq/docs/DOC-15523?sc_cid=70160000000HlgQAAS
