This is a list of all System zEC12 CPU's performance counter event types. Please see the "The Load-Program-Parameter and CPU-Measurement Facilities" document at http://www-01.ibm.com/support/docview.wss?uid=isg26fcd1cc32246f4c8852574ce0044734a.
| Name | Description | Counters usable | Unit mask options |
| CPU_CYCLES | Processor cycles | all | |
| INSTRUCTIONS | Instructions completed | all |
Optimizations always bust things, because all optimizations are, in the long haul, a form of cheating, and cheaters eventually get caught.- Larry Wall