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v/vlib/sync/bench/results.md

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Channel Benchmark Results

This documents lists several benchmark results for different platforms in order to identify performance regressions and improvements.

The are measured using the command

> channel_bench_* <nsend> <nrec> <buflen> <nobj>

nsend ... number of threads that push objects into the channel
nrec .... number of threads that pop objects from the channel
buflen .. length of channel buffer queue - `0` means unbuffered channel
nobj .... number of objects to pass thru the channel

AMD Ryzen 7 3800X, Ubuntu-20.04 x86_64

10000000 Objects transfered, results in Objects/µs

nsend nrec buflen V (gcc -O2) V (clang) V (tcc) Go (golang) Go (gccgo -O2)
1 1 0 1.97 1.63 2.08 4.65 0.56
1 1 100 3.05 2.29 1.93 18.90 6.08
4 4 0 0.87 0.90 0.99 1.84 0.84
4 4 100 3.35 3.07 2.92 7.43 3.71

AMD Ryzen 7 3800X, Windows 10 2004 x64

nsend nrec buflen V (gcc -O2) V (msvc /O2) V (tcc) Go (golang)
1 1 0 0.30 0.33 0.31 4.67
1 1 100 1.76 2.05 1.76 23.31
4 4 0 0.18 0.19 0.19 1.38
4 4 100 2.54 2.32 2.07 4.63

Raspberry Pi 3B+, Void Linux musl 32 bit

10000000 Objects transfered, results in Objects/µs

nsend nrec buflen V (gcc -O2) Go (golang)
1 1 0 0.37 0.21
1 1 100 1.03 0.74
4 4 0 0.04 0.38
4 4 100 2.78 2.63
2 2 0 0.05 0.38
2 2 100 1.26 0.75