Re: [Libguestfs] [PATCH libnbd 8/9] golang: aio_buffer.go: Benchmark copy flows

Add benchmark for coping a buffer using 3 strategies - reusing same buffer, making a new uninitialized buffer per copy, and using a zeroed buffer per copy. This benchmark is the worst possible case, coping a

buffer to memory. Any real I/O will be much slower hiding the overhead of allocating buffer or zeroed buffered.

$ go test -run=AioBuffer -bench=Copy -benchtime=5s goos: linux goarch: amd64 pkg: libguestfs.org/libnbd cpu: Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz BenchmarkAioBufferCopyBaseline-12 1142508 4523 ns/op BenchmarkAioBufferCopyMake-12 1000000 5320 ns/op BenchmarkAioBufferCopyMakeZero-12 728940 8218 ns/op Signed-off-by: Nir Soffer <nsoffer(a)redhat.com&gt; --- golang/libnbd_620_aio_buffer_test.go | 32 ++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/golang/libnbd_620_aio_buffer_test.go b/golang/libnbd_620_aio_buffer_test.go index 8f65b558..9ab411b3 100644 --- a/golang/libnbd_620_aio_buffer_test.go +++ b/golang/libnbd_620_aio_buffer_test.go @@ -195,10 +195,42 @@ func BenchmarkAioBufferBytes(b *testing.B) { func BenchmarkAioBufferSlice(b *testing.B) { buf := MakeAioBuffer(bufferSize) defer buf.Free() var r int b.ResetTimer()