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Measure decompression time in compressio decompression benchmarks.

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IIUC, Go sets testing.b.N by running benchmarks repeatedly with increasing
values of b.N until a "reasonable" benchmark run time is achieved. Before this
CL, decompression benchmarks measure the time to perform *compression* once
while scaling the number of decompressions with b.N, making the Go-observed
benchmark time independent of b.N and causing Go to increase b.N to
unpredictable and unreasonable amounts:

```
BenchmarkDecompressNoHash1M
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 821.474577ms, ratio 0.75, decompression time 1.161417487s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 526.175362ms, ratio 0.75, decompression time 1.937750371s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 767.402422ms, ratio 0.75, decompression time 2.156883246s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 779.148676ms, ratio 0.75, decompression time 2.396898003s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 577.573005ms, ratio 0.75, decompression time 3.266100928s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 524.66472ms, ratio 0.75, decompression time 5.922212382s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 714.897653ms, ratio 0.75, decompression time 13.105200153s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 768.187436ms, ratio 0.75, decompression time 19.574360494s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 625.937757ms, ratio 0.75, decompression time 30.097482785s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 767.470509ms, ratio 0.75, decompression time 56.130162322s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 527.026934ms, ratio 0.75, decompression time 1m36.04235679s
    pkg/compressio/compressio_test.go:152: compress=false, hash=false, len(data)=838860800, blockSize=1048576: compression time 943.736532ms, ratio 0.75, decompression time 3m15.294992151s
panic: SIGTERM
```
PiperOrigin-RevId: 615249406
This commit is contained in:
Jamie Liu
2024-03-12 19:15:07 -07:00
committed by gVisor bot
parent 3b314aad88
commit a1ebe3cf80
1 changed files with 14 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pkg/compressio/compressio_test.go
+14 -15
View File
@@ -219,31 +219,30 @@ func benchmark(b *testing.B, compress bool, hash bool, blockSize uint32) {
b.StopTimer()
b.SetBytes(benchDataSize)
data := initTest(b, benchDataSize)
compIters := b.N
decompIters := b.N
if compress {
decompIters = 0
} else {
compIters = 0
}
key := hashKey
if !hash {
key = nil
}
doTest(b, testOpts{
Name: fmt.Sprintf("compress=%t, hash=%t, len(data)=%d, blockSize=%d", compress, hash, len(data), blockSize),
Data: data,
PreCompress: b.StartTimer,
PostCompress: b.StopTimer,
opts := testOpts{
Name: fmt.Sprintf("compress=%t, hash=%t, len(data)=%d, blockSize=%d", compress, hash, len(data), blockSize),
Data: data,
NewWriter: func(b *bytes.Buffer) (io.Writer, error) {
return NewWriter(b, key, blockSize, flate.BestSpeed)
},
NewReader: func(b *bytes.Buffer) (io.Reader, error) {
return NewReader(b, key)
},
CompressIters: compIters,
DecompressIters: decompIters,
})
}
if compress {
opts.PreCompress = b.StartTimer
opts.PostCompress = b.StopTimer
opts.CompressIters = b.N
} else {
opts.PreDecompress = b.StartTimer
opts.PostDecompress = b.StopTimer
opts.DecompressIters = b.N
}
doTest(b, opts)
}
func BenchmarkCompressNoHash64K(b *testing.B) {