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perf: Performance Counters • Key Linux Performance Analysis and Tools

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perf: Performance Counters • Key performance counter summary: $ perf stat gzip file1 Performance counter stats for gzip file1: 2294.924314 task-clock-msecs # 0.901 CPUs 62 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 265 page-faults # 0.000 M/sec 5496871381 cycles # 2395.230 M/sec 12210601948 instructions # 2.221 IPC yay 1263678628 branches # 550.641 M/sec 13037608 branch-misses # 1.032 % 4725467 cache-references # 2.059 M/sec 2779597 cache-misses # 1.211 M/sec 2.546444859 seconds time elapsed • Low IPC (<0.2) means stall cycles (likely memory); look for ways to reduce memory I/O, and improve locality (NUMA)Sunday, February 24, 13

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