s2: Add concurrent stream decompression #602
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Add concurrent stream decompression of snappy/s2 streams Fixes #397 ``` e:\gopath\src\github.com\klauspost\compress\s2\cmd\s2d (master -> klauspost) λ s2d -bench=3 -cpu=1 enwik10.snappy Reading enwik10.snappy... Decompressing... 4340323220 -> 10000000000 [230.40%]; 8.681s, 1098.6MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 8.744s, 1090.7MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 8.711s, 1094.8MB/s e:\gopath\src\github.com\klauspost\compress\s2\cmd\s2d (master -> klauspost) λ s2d -bench=3 -cpu=2 enwik10.snappy Reading enwik10.snappy... Decompressing... 4340323220 -> 10000000000 [230.40%]; 5.259s, 1813.4MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 5.241s, 1819.8MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 5.255s, 1814.7MB/s e:\gopath\src\github.com\klauspost\compress\s2\cmd\s2d (master -> klauspost) λ s2d -bench=3 -cpu=4 enwik10.snappy Reading enwik10.snappy... Decompressing... 4340323220 -> 10000000000 [230.40%]; 2.63s, 3625.6MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 2.646s, 3604.8MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 2.644s, 3606.5MB/s e:\gopath\src\github.com\klauspost\compress\s2\cmd\s2d (master -> klauspost) λ s2d -bench=3 -cpu=8 enwik10.snappy Reading enwik10.snappy... Decompressing... 4340323220 -> 10000000000 [230.40%]; 1.38s, 6910.6MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 1.387s, 6873.4MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 1.387s, 6875.8MB/s e:\gopath\src\github.com\klauspost\compress\s2\cmd\s2d (master -> klauspost) λ s2d -bench=3 -cpu=16 enwik10.snappy Reading enwik10.snappy... Decompressing... 4340323220 -> 10000000000 [230.40%]; 894ms, 10668.5MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 882ms, 10818.2MB/s Decompressing... 4340323220 -> 10000000000 [230.40%]; 903ms, 10558.8MB/s ```
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Add concurrent stream decompression of snappy/s2 streams
Fixes #397
For full stream decompression S2 offers a
DecodeConcurrentfunction that will decode a full stream using multiple goroutines.Example scaling, AMD Ryzen 3950X, 16 cores, decompression using
s2d -bench=3 <input>, best of 3:-cpu=1-cpu=2-cpu=4-cpu=8-cpu=16Scaling can be expected to be pretty linear until memory bandwidth is saturated.
For now the
DecodeConcurrentcan only be used for full streams without seeking or combining with regular reads.