mpstat (Solaris)

The mpstat command reports per processor statistics. Each row of the table represents the activity of one processor. Pay close attention to the smtx measurement. Smtx measures the no. of times the CPU failed to obtain a mutex (Mutual Exclusion Lock). Mutex stalls waste CPU time and degrade multiprocessor scaling.

# mpstat

If the smtx value is greater than 200, then the system is heading towards a CPU bottleneck.

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