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CGO Performance In Go 1.21 (shane.ai)

submitted 11 months ago by [email protected] to c/[email protected]

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Cgo calls take about 40ns, about the same time encoding/json takes to parse a single digit integer. On my 20 core machine Cgo call performance scales with core count up to about 16 cores, after which some known contention issues slow things down.

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[–] [email protected] 5 points 11 months ago

That's pretty decent. I'm not convinced about the 16 core limit though, the 12700H has 6 P-cores, 8 E-cores and 6 threads, totalling "20 cores". Not the best chip to benchmark multicore workloads