How to disable processors

Hi all,
I use a full system simulator simics to boot sun solaris os and do some research on it. Now I have no idea how to disable a specified cpux after the system is booted. I have tried to use "psradm -f ID" to disable the cpuID. However, it seems that the processor won't be totally removed and after cycles running the system may latter crash. The reason I guess is that some tasks are still load onto that disabled processor.
I also found the asr-disable is good enough for some platform such as v440/v880. However I just got the sarek simulation environment, so I wonder whether there will be similar commands to totally disable the specified cpu so that the OS would not schedule any task or process to that processor.
Sorry for such silly questions. I just want to advance my researches.
Thanks in advances!
yihui

Thanks for your reply.
Simics has the function of completely disabing any processor in simics. The reason why the system crashed later is that the OS do use the offline core to do some work, which is assumed in simics that the core is totally disabled. Therefore, the task in disabled core would not be processed and the system finally crashed.
So I just want to completely disable a specified core so that OS would not allocate any tasks to that core in the subsequent running of the system. Is there any good ideas?

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