v/vlib/sync/bench/results.md

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 (glang)	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 (glang)
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