Decompression of level 20 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 | 1.539× |
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 | 2.05 | 1.998–2.109 | — | 1.000× |
| mzstd | 0.03818 | 0.03755–0.03893 | — | 53.690× |
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 | 2.014 | 1.959–2.088 | 20.83 | 1.000× |
| mzstd | 0.04856 | 0.04812–0.04904 | 864.17 | 41.478× |
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 | 3.002 | 2.923–3.087 | 20,816.62 | 1.000× |
| mzstd | 0.9047 | 0.896–0.9144 | 69,086.74 | 3.319× |
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 | 7.057 | 6.756–7.37 | 8,855.97 | 1.000× |
| mzstd | 4.523 | 4.359–4.717 | 13,819.39 | 1.560× |
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 | 14.33 | 13.99–14.72 | 69,785.38 | 1.000× |
| mzstd | 9.442 | 9.244–9.663 | 105,910.67 | 1.518× |
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 | 20.02 | 19.77–20.27 | 49,954.89 | 1.000× |
| mzstd | 17.69 | 17.44–17.95 | 56,535.56 | 1.132× |
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 | 111.4 | 105.8–117.6 | 1,302.35 | 1.000× |
| mzstd | 110.7 | 107.6–114.4 | 1,310.79 | 1.006× |
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 | 122.5 | 118.7–127 | 8,165.86 | 1.000× |
| mzstd | 131 | 126.4–136.2 | 7,635.64 | 0.935× |