You get this error message because you have another perfmon session on your system. Check with ps, or cat /sys/kernel/perfmon/sys_session_count.

On Mar 24, 2009 9:52 AM, "J Green" <greenabc99@gmail.com> wrote:

Hi, All:

      when I use "pfmon ls /dev/null" in command line, it shows "error concurrent system-wide monitoring session exists" why I can not see the information just like:     
      620458 CPU_CYCLES?



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