Go 1.26 cgo Benchmark

README.md

Go 1.26 cgo Benchmark

This is an extremely simple benchmark of the cgo performance improvements in Go 1.26.

Results

goos: linux
goarch: amd64
pkg: test
cpu: AMD Ryzen 9 3900X 12-Core Processor            
       │ go1.25.txt  │             go1.26.txt              │
       │   sec/op    │   sec/op     vs base                │
Add-24   50.12n ± 3%   26.52n ± 1%  -47.08% (p=0.000 n=10)

       │ go1.25.txt │           go1.26.txt           │
       │    B/op    │    B/op     vs base            │
Add-24   0.000 ± 0%   0.000 ± 0%  ~ (p=1.000 n=10) ¹
¹ all samples are equal

       │ go1.25.txt │           go1.26.txt           │
       │ allocs/op  │ allocs/op   vs base            │
Add-24   0.000 ± 0%   0.000 ± 0%  ~ (p=1.000 n=10) ¹
¹ all samples are equal

go.mod

module test

go 1.25.7

go1.25.txt

goos: linux
goarch: amd64
pkg: test
cpu: AMD Ryzen 9 3900X 12-Core Processor            
BenchmarkAdd-24    	24672879	        50.24 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24842866	        49.66 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	23953146	        50.05 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24052581	        50.54 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24633309	        47.81 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24236566	        48.74 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24326767	        49.98 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	23441038	        50.35 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	23992288	        50.18 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	24074400	        50.30 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	test	12.066s

go1.26.txt

goos: linux
goarch: amd64
pkg: test
cpu: AMD Ryzen 9 3900X 12-Core Processor            
BenchmarkAdd-24    	45638282	        26.50 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	41911680	        26.67 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	45225888	        26.67 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	45311896	        26.68 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	44342197	        26.44 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	44602566	        26.44 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	45509528	        26.54 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	45564736	        26.55 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	44621707	        26.45 ns/op	       0 B/op	       0 allocs/op
BenchmarkAdd-24    	44866058	        26.32 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	test	11.880s

test.c

#include "test.h"

int add(int a, int b) {
	return a + b;
}

test.go

package test

/*
#include "test.h"
*/
import "C"

func Add(a, b int) int {
	return int(C.add(C.int(a), C.int(b)))
}

test.h

int add(int, int);

test_test.go

package test_test

import (
	"math/rand/v2"
	"test"
	"testing"
)

func BenchmarkAdd(b *testing.B) {
	v1, v2 := rand.Int(), rand.Int()

	b.ResetTimer()
	for b.Loop() {
		test.Add(v1, v2)
	}
}