Decompression of level 21 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 | 1.496× |
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 | 1.977 | 1.94–2.021 | — | 1.000× |
| mzstd | 0.03812 | 0.03739–0.03898 | — | 51.872× |
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 | 1.983 | 1.95–2.024 | 21.16 | 1.000× |
| mzstd | 0.04909 | 0.04847–0.04979 | 854.80 | 40.394× |
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 | 2.884 | 2.836–2.938 | 21,673.94 | 1.000× |
| mzstd | 0.9423 | 0.9219–0.9645 | 66,325.13 | 3.060× |
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 | 15.38 | 14.85–15.94 | 65,033.63 | 1.000× |
| mzstd | 9.384 | 9.229–9.557 | 106,562.30 | 1.639× |
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 | 7.123 | 6.798–7.463 | 8,773.99 | 1.000× |
| mzstd | 5.266 | 5.015–5.528 | 11,869.30 | 1.353× |
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 | 19.46 | 19.34–19.59 | 51,397.58 | 1.000× |
| mzstd | 17.23 | 17.12–17.36 | 58,023.29 | 1.129× |
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 | 124.1 | 120.3–128.3 | 8,061.02 | 1.000× |
| mzstd | 128.3 | 124.6–132.8 | 7,791.43 | 0.967× |
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 | 116 | 111.4–120.8 | 1,250.53 | 1.000× |
| mzstd | 122.7 | 116.6–129.2 | 1,182.39 | 0.946× |