💾 Archived View for ser1.net › post › universal-truths.gmi captured on 2023-05-24 at 17:52:35. Gemini links have been rewritten to link to archived content
⬅️ Previous capture (2022-07-16)
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The fact that channel communications (whatever their implementation details) take much, much longer than function calls seems to be a constant truth no matter what the programming language. I don't have the benchmarks for Erlang offhand, but here are ones that I just recently ran for Go:
main.BenchmarkChannel-2 500000 6106 ns/op main.BenchmarkFunction-2 100000000 10.2 ns/op main.BenchmarkAnonymous-2 100000000 11.5 ns/op
Here's the source code in case you want to pick holes in my benchmark:
package main
import "testing"
func BenchmarkChannel(b *testing.B) {
c := make(chan int, 1000)
accum := 0
go func() { for { accum += <-c } }()
for i := 0; i < b.N; i++ {
c <- i
}
}
func BenchmarkFunction(b *testing.B) {
accum := 0
for i := 0; i < b.N; i++ {
handle(i, &accum)
}
}
func handle(v int, accum *int) {
*accum += v
}
func BenchmarkAnonymous(b *testing.B) {
accum := 0
f := func(i int) { accum += i }
for i := 0; i < b.N; i++ {
f(i)
}
}
This was run with:
gotest -run -cpu=2 -bench='.*'
Changing GOMAXPROCS didn't make any difference. I was running it on a Core 2 Duo. It's not hugely surprising, but still. It makes me wonder how the ratio of performance compares between languages.