This is a list of Alpha EV67 CPU's performance counter event types. Please see alpha architecture reference
| Name | Description | Counters usable | Unit mask options |
| CYCLES | Total cycles | 0, 1 | |
| INSTRUCTIONS | Retired instructions | 0 | |
| BCACHE_MISS | Bcache misses/long probe latency | 1 | |
| MBOX_REPLAY | Mbox replay traps | 1 |
Measurement is a crucial component of performance improvement since reasoning and intuition are fallible guides and must be supplemented with tools like timing commands and profilers.- The Practice of Programming, Brian W. Kernighan and Rob Pike