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by lucian-g
1268 days ago
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It depends on the implementation: https://cpucycles.cr.yp.to/counters.html - default-perfevent: the kernel will keep track of counter values on core moves - amd64-pmc: Accesses a cycle counter through RDPMC: best to pin the benchmark binary to a specific core to avoid measurement issues when the task moves between cores: "taskset -c 1 <benchmark-binary>" - amd64-tsc, amd64-tscasm: RDTSC is off-core counter - not influenced by cross-core moves ("On current CPUs, this is an off-core clock rather than a cycle counter, but it is typically a very fast off-core clock, making it adequate for seeing cycle counts if overclocking and underclocking are disabled.") |
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