Decompression of level 22 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 | 1.428× |
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 | 2.029 | 1.978–2.091 | — | 1.000× |
| mzstd | 0.03755 | 0.03692–0.03833 | — | 54.034× |
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 | 2.015 | 1.961–2.082 | 20.83 | 1.000× |
| mzstd | 0.05361 | 0.05132–0.05609 | 782.74 | 37.584× |
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 | 2.824 | 2.799–2.852 | 22,133.47 | 1.000× |
| mzstd | 0.9283 | 0.9107–0.9474 | 67,327.79 | 3.042× |
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 | 15.85 | 15.34–16.37 | 63,104.31 | 1.000× |
| mzstd | 9.345 | 9.181–9.54 | 107,009.86 | 1.696× |
binary-64k
64 KiB of structured binary bytes: ((i / 16) XOR i) modulo 256.
1,259 compressed → 65,536 restored bytes; compressed / original: 1.921%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 6.929 | 6.669–7.196 | 9,020.53 | 1.000× |
| mzstd | 5.974 | 5.758–6.183 | 10,461.55 | 1.160× |
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 | 20 | 19.79–20.22 | 50,006.48 | 1.000× |
| mzstd | 17.4 | 17.28–17.55 | 57,460.35 | 1.149× |
alice29
Alice in Wonderland text from the Canterbury corpus (testdata/alice29.txt).
49,211 compressed → 152,089 restored bytes; compressed / original: 32.357%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 112.7 | 108.4–117.3 | 1,287.22 | 1.000× |
| mzstd | 115.1 | 110.2–120.9 | 1,259.63 | 0.979× |
text-1m
Alice text repeated cyclically to 1 MiB.
49,285 compressed → 1,048,576 restored bytes; compressed / original: 4.700%.
| Decoder | Mean µs | 95% mean interval µs | Decoded MiB/s | Speed / C |
|---|---|---|---|---|
| zstd C | 120.1 | 117.3–123.3 | 8,323.89 | 1.000× |
| mzstd | 126 | 123.3–129.3 | 7,933.85 | 0.953× |