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// +build go1.7
// ^^^^^^^^^^^^ we use the "sub-benchmark" feature that was added in Go 1.7
package cryptocore
import (
"fmt"
"testing"
)
/*
The throughput we get from /dev/urandom / getentropy depends a lot on the used
block size. Results on my Pentium G630 running Linux 4.11:
BenchmarkRandSize/16-2 3000000 571 ns/op 27.98 MB/s
BenchmarkRandSize/32-2 3000000 585 ns/op 54.66 MB/s
BenchmarkRandSize/64-2 2000000 860 ns/op 74.36 MB/s
BenchmarkRandSize/128-2 1000000 1197 ns/op 106.90 MB/s
BenchmarkRandSize/256-2 1000000 1867 ns/op 137.06 MB/s
BenchmarkRandSize/512-2 500000 3187 ns/op 160.61 MB/s
BenchmarkRandSize/1024-2 200000 5888 ns/op 173.91 MB/s
BenchmarkRandSize/2048-2 100000 11554 ns/op 177.25 MB/s
BenchmarkRandSize/4096-2 100000 22523 ns/op 181.86 MB/s
BenchmarkRandSize/8192-2 30000 43111 ns/op 190.02 MB/s
Results are similar when testing with dd, so this is not due to Go allocation
overhead: dd if=/dev/urandom bs=16 count=100000 of=/dev/null
*/
func BenchmarkUrandomBlocksize(b *testing.B) {
for s := 16; s <= 8192; s *= 2 {
title := fmt.Sprintf("%d", s)
b.Run(title, func(b *testing.B) {
b.SetBytes(int64(s))
for i := 0; i < b.N; i++ {
RandBytes(s)
}
})
}
}
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