Decompression of level 11 frames
Decoder overview · Benchmark index
Recorded run: long-20261109 (2026-11-09). CSV · Environment · Methodology and limits.
Level belongs to the C encoder that prepared the frame; decoders have no level setting. Both decoders restore the same bytes.
Median speed across 8 datasets
Median of per-dataset C mean time / decoder mean time ratios, with equal weight. Higher is faster; 1× matches C. No confidence interval is inferred for this across-dataset median.
| Decoder | Median speed / C |
|---|---|
| zstd C | 1.000× |
| mzstd | 1.542× |
Datasets are ranked by mzstd speed relative to C, highest first. Throughput counts restored bytes; empty input has latency only. Whiskers and intervals describe sampling uncertainty, not all host variation. Cold APIs include allocation and disposal. C reads the frame’s content size and decodes into a buffer of exactly that size; mzstd returns its own vector.
empty
Empty input; measures API overhead.
9 compressed → 0 restored bytes; compressed / original: undefined.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 2.07 | 2.023–2.123 | — | 1.000× |
| mzstd | 0.04046 | 0.03937–0.04168 | — | 51.172× |
tiny-text
44-byte quick-brown-fox sentence.
53 compressed → 44 restored bytes; compressed / original: 120.455%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 2.105 | 2.049–2.165 | 19.93 | 1.000× |
| mzstd | 0.05286 | 0.05085–0.05507 | 793.86 | 39.825× |
random-64k
64 KiB prefix of the deterministic pseudorandom corpus.
65,546 compressed → 65,536 restored bytes; compressed / original: 100.015%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 2.937 | 2.867–3.018 | 21,283.04 | 1.000× |
| mzstd | 0.9627 | 0.9522–0.9741 | 64,923.89 | 3.050× |
binary-64k
64 KiB of structured binary bytes: ((i / 16) XOR i) modulo 256.
1,276 compressed → 65,536 restored bytes; compressed / original: 1.947%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 7.224 | 6.885–7.562 | 8,651.43 | 1.000× |
| mzstd | 4.538 | 4.334–4.761 | 13,772.72 | 1.592× |
repeated-1m
1 MiB of repeated a bytes.
49 compressed → 1,048,576 restored bytes; compressed / original: 0.005%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 15.26 | 14.84–15.71 | 65,533.34 | 1.000× |
| mzstd | 10.23 | 9.961–10.52 | 97,718.67 | 1.491× |
random-1m
1 MiB of deterministic xorshift64 pseudorandom bytes.
1,048,609 compressed → 1,048,576 restored bytes; compressed / original: 100.003%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 19.98 | 19.78–20.2 | 50,044.73 | 1.000× |
| mzstd | 17.96 | 17.76–18.15 | 55,690.81 | 1.113× |
text-1m
Alice text repeated cyclically to 1 MiB.
52,034 compressed → 1,048,576 restored bytes; compressed / original: 4.962%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 111.5 | 107.3–116 | 8,965.69 | 1.000× |
| mzstd | 108 | 104.9–111.9 | 9,256.13 | 1.032× |
alice29
Alice in Wonderland text from the Canterbury corpus (testdata/alice29.txt).
51,491 compressed → 152,089 restored bytes; compressed / original: 33.856%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 92.44 | 89.81–95.56 | 1,569.03 | 1.000× |
| mzstd | 99.8 | 96.2–104 | 1,453.36 | 0.926× |