diff options
author | Jakob Unterwurzacher | 2017-08-16 18:33:00 +0200 |
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committer | Jakob Unterwurzacher | 2017-08-16 18:33:00 +0200 |
commit | 312ea32bb70abb93be315d0b7c442d5c4ae571d9 (patch) | |
tree | 31c7b91db06bf208a6d44dae0058171dd6735b80 /internal/cryptocore/randsize_test.go | |
parent | 838bf883df579a414289a3e05d238c582ac78523 (diff) |
cryptocore: add urandom + randprefetch benchmarks
The benchmark that supported the decision for 512-byte
prefetching previously lived outside the repo.
Let's add it where it belongs so it cannot get lost.
Diffstat (limited to 'internal/cryptocore/randsize_test.go')
-rw-r--r-- | internal/cryptocore/randsize_test.go | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/internal/cryptocore/randsize_test.go b/internal/cryptocore/randsize_test.go new file mode 100644 index 0000000..1db4745 --- /dev/null +++ b/internal/cryptocore/randsize_test.go @@ -0,0 +1,40 @@ +// +build go1.7 + +// ^^^^^^^^^^^^ we use the "sub-benchmark" feature that was added in Go 1.7 + +package cryptocore + +import ( + "fmt" + "testing" +) + +/* +The troughput 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) + } + }) + } +} |