mirror of https://github.com/octoleo/restic.git
53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package restic_test
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import (
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"math/rand"
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"testing"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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)
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func TestZeroPrefixLen(t *testing.T) {
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var buf [2048]byte
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// test zero prefixes of various lengths
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for i := len(buf) - 1; i >= 0; i-- {
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buf[i] = 42
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skipped := restic.ZeroPrefixLen(buf[:])
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test.Equals(t, i, skipped)
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}
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// test buffers of various sizes
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for i := 0; i < len(buf); i++ {
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skipped := restic.ZeroPrefixLen(buf[i:])
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test.Equals(t, 0, skipped)
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}
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}
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func BenchmarkZeroPrefixLen(b *testing.B) {
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var (
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buf [4<<20 + 37]byte
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r = rand.New(rand.NewSource(0x618732))
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sumSkipped int64
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)
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b.ReportAllocs()
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b.SetBytes(int64(len(buf)))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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j := r.Intn(len(buf))
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buf[j] = 0xff
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skipped := restic.ZeroPrefixLen(buf[:])
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sumSkipped += int64(skipped)
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buf[j] = 0
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}
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// The closer this is to .5, the better. If it's far off, give the
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// benchmark more time to run with -benchtime.
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b.Logf("average number of zeros skipped: %.3f",
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float64(sumSkipped)/(float64(b.N*len(buf))))
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}
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