About core-to-core-latency-plus
core-to-core-latency-plus measures communication latency between CPU cores. It pins two threads to separate cores and has them perform compare-and-swap operations that exercise the processor’s cache-coherence protocol. Compare-and-swap is an atomic operation used by software to update shared values safely; the time taken for cores to coordinate over such operations can reveal communication overhead. The utility collects benchmark data and is described as improving the usability of an earlier measurement tool. It is intended for low-level performance investigation, where understanding how processor cores exchange data can help characterize a system. The supplied information does not specify measurement units, repeatability controls, or how results should be compared across different processor models, so those details are not assumed.
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