mirror of
https://github.com/kopia/kopia.git
synced 2026-05-11 00:04:46 -04:00
bbbf65de8c
This has huge performance benefits for `zstd` and `pgzip` BEFORE: ``` 0. s2-parallel-4 35.1 MB 8.9 GB/s 688 4.6 GB 1. s2-parallel-8 35.1 MB 8.1 GB/s 688 4.6 GB 2. s2-default 35.1 MB 8 GB/s 689 4.6 GB 3. s2-better 33.7 MB 7.2 GB/s 689 4.6 GB 4. zstd-fastest 18.4 MB 6.3 GB/s 22281 1.2 GB 5. zstd-better-compression 16.4 MB 5.3 GB/s 17957 2 GB 6. zstd 18.1 MB 4.8 GB/s 17711 2.1 GB 7. deflate-best-speed 20.6 MB 3.7 GB/s 4672 6.4 MB 8. deflate-best-compression 18.4 MB 3.5 GB/s 8352 6.5 MB 9. pgzip-best-speed 20.6 MB 3.5 GB/s 27871 679.1 MB 10. deflate-default 19.7 MB 3.5 GB/s 9152 6.4 MB 11. pgzip-best-compression 18.4 MB 3.3 GB/s 29494 679.1 MB 12. pgzip 19.7 MB 3.3 GB/s 32835 679.2 MB 13. gzip 19.3 MB 2.9 GB/s 1427888 4.4 GB 14. gzip-best-compression 18.5 MB 2.7 GB/s 1489968 4.4 GB 15. gzip-best-speed 21.6 MB 2.3 GB/s 1373330 4.4 GB ``` AFTER: ``` 0. lz4 33.9 MB 13.4 GB/s 261 4.4 GB (deprecated) 1. s2-default 35.1 MB 10.2 GB/s 275 4.3 GB 2. s2-better 33.7 MB 9.7 GB/s 274 4.3 GB 3. s2-parallel-8 35.1 MB 9.7 GB/s 278 4.3 GB 4. s2-parallel-4 35.1 MB 9.4 GB/s 288 4.3 GB 5. zstd-fastest 18.4 MB 6.9 GB/s 1192 90.1 MB 6. zstd-better-compression 16.4 MB 5.8 GB/s 1162 158.8 MB 7. zstd-best-compression 16.2 MB 5.7 GB/s 1183 159.3 MB (deprecated) 8. zstd 18.1 MB 5.2 GB/s 1103 158 MB 9. deflate-best-speed 20.6 MB 3.8 GB/s 4672 6.4 MB 10. deflate-best-compression 18.4 MB 3.6 GB/s 8352 6.5 MB 11. pgzip-best-compression 18.4 MB 3.2 GB/s 28489 75 MB 12. pgzip-best-speed 20.6 MB 3.2 GB/s 26725 74.9 MB 13. pgzip 19.7 MB 3.1 GB/s 31889 75.1 MB 14. gzip-best-compression 18.5 MB 3.1 GB/s 1489269 4.4 GB 15. deflate-default 19.7 MB 2.6 GB/s 9164 6.4 MB 16. gzip-best-speed 21.6 MB 2.4 GB/s 1372639 4.4 GB 17. gzip 19.3 MB 2.2 GB/s 1427205 4.4 GB ```
85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package compression
|
|
|
|
import (
|
|
"compress/gzip"
|
|
"io"
|
|
"sync"
|
|
|
|
"github.com/pkg/errors"
|
|
|
|
"github.com/kopia/kopia/internal/freepool"
|
|
"github.com/kopia/kopia/internal/iocopy"
|
|
)
|
|
|
|
func init() {
|
|
RegisterCompressor("gzip", newGZipCompressor(headerGzipDefault, gzip.DefaultCompression))
|
|
RegisterCompressor("gzip-best-speed", newGZipCompressor(headerGzipBestSpeed, gzip.BestSpeed))
|
|
RegisterCompressor("gzip-best-compression", newGZipCompressor(headerGzipBestCompression, gzip.BestCompression))
|
|
}
|
|
|
|
func newGZipCompressor(id HeaderID, level int) Compressor {
|
|
return &gzipCompressor{id, compressionHeader(id), sync.Pool{
|
|
New: func() interface{} {
|
|
w, err := gzip.NewWriterLevel(io.Discard, level)
|
|
mustSucceed(err)
|
|
return w
|
|
},
|
|
}}
|
|
}
|
|
|
|
type gzipCompressor struct {
|
|
id HeaderID
|
|
header []byte
|
|
pool sync.Pool
|
|
}
|
|
|
|
func (c *gzipCompressor) HeaderID() HeaderID {
|
|
return c.id
|
|
}
|
|
|
|
func (c *gzipCompressor) Compress(output io.Writer, input io.Reader) error {
|
|
if _, err := output.Write(c.header); err != nil {
|
|
return errors.Wrap(err, "unable to write header")
|
|
}
|
|
|
|
//nolint:forcetypeassert
|
|
w := c.pool.Get().(*gzip.Writer)
|
|
defer c.pool.Put(w)
|
|
|
|
w.Reset(output)
|
|
|
|
if err := iocopy.JustCopy(w, input); err != nil {
|
|
return errors.Wrap(err, "compression error")
|
|
}
|
|
|
|
if err := w.Close(); err != nil {
|
|
return errors.Wrap(err, "compression close error")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
//nolint:gochecknoglobals
|
|
var gzipDecoderPool = freepool.New(func() *gzip.Reader {
|
|
return new(gzip.Reader)
|
|
}, func(_ *gzip.Reader) {})
|
|
|
|
func (c *gzipCompressor) Decompress(output io.Writer, input io.Reader, withHeader bool) error {
|
|
if withHeader {
|
|
if err := verifyCompressionHeader(input, c.header); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
dec := gzipDecoderPool.Take()
|
|
defer gzipDecoderPool.Return(dec)
|
|
|
|
mustSucceed(dec.Reset(input))
|
|
|
|
if err := iocopy.JustCopy(output, dec); err != nil {
|
|
return errors.Wrap(err, "decompression error")
|
|
}
|
|
|
|
return nil
|
|
}
|