将一个已经运行的进程attach到固定CPU内核上的方法（linux,windows)

在此前工作中对mysql的调优中曾经使用过该命令，将mysql的实例在制定的若干CPU内核上执行。

Retrieve the CPU affinity of an existing task

The general syntax is as follows:
taskset -p [pid]
To retrieve the CPU affinity of an existing task (PID 12345), enter:
# taskset -p 12345

Use taskset command to CPU affinity

The general syntax is as follows:
taskset -c [0,1,2,3..N] [pid]
Where,

• -c 0,1,2,..N : The masks are typically given in hexadecimal. For example, 0x00000001 is processor #0, 0x00000003 is processors #0 and #1 etc. However -c option allows you to specifiy a numerical list of processors instead of a bitmask. The list may contain multiple items, separated by comma, and ranges. For example, 0,5,7,9-11.
  : Process / program ID
• pid

For example set PID 12345 on 2-3 CPU, enter:
# taskset -c 2,3 12345

参见：http://www.cyberciti.biz/faq/taskset-cpu-affinity-command/

windows多核环境可以在任务管理器中图形化设置比较方便，如下图：

如果mysql是允许在windows环境，可以通过这种方法来调优。