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decompress .json.zstd fetched by getSaveData

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Altair-sh
2026-09-23 18:24:45 +02:00
parent f1a60a208c
commit 7d64ab4809
6 changed files with 67 additions and 39 deletions
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COMPRESSION.md
+27 -27
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@@ -5,8 +5,8 @@ Reference for `saveUpload.zstdCompressionLevel` in
out to be too slow or too memory hungry on some device, pick a different level
from the table below rather than measuring again.
The level only affects the uploader. Decompression on the parser backend costs
the same at every level.
The level only affects the uploader. Decompression costs the same at every
level, both on the parser backend and in the browser.
## What was measured
@@ -33,34 +33,34 @@ correct output rather than merely fast output.
## The table
| level | compressed | ratio | compress | decompress | encoder heap | decoder heap | window |
| -----: | ------------: | --------: | ---------: | ---------: | -----------: | -----------: | -----: |
| 1 | 6,698,281 | 1.72x | 0.54 s | 0.28 s | 8 MB | 8 MB | 1 MB |
| 2 | 6,600,451 | 1.74x | 0.54 s | 0.29 s | 8 MB | 8 MB | 1 MB |
| 3 | 6,094,116 | 1.89x | 0.57 s | 0.28 s | 8 MB | 8 MB | 2 MB |
| 4 | 6,082,362 | 1.89x | 0.61 s | 0.28 s | 8 MB | 8 MB | 2 MB |
| 5 | 5,280,090 | 2.18x | 0.92 s | 0.28 s | 8 MB | 8 MB | 2 MB |
| 6 | 4,943,366 | 2.33x | 1.13 s | 0.27 s | 8 MB | 8 MB | 2 MB |
| 7 | 4,738,515 | 2.43x | 1.27 s | 0.27 s | 9 MB | 8 MB | 2 MB |
| 8 | 4,514,853 | 2.55x | 1.52 s | 0.28 s | 9 MB | 8 MB | 2 MB |
| 9 | 4,445,368 | 2.59x | 1.51 s | 0.26 s | 16 MB | 8 MB | 4 MB |
| 10 | 4,280,567 | 2.69x | 1.74 s | 0.27 s | 26 MB | 8 MB | 4 MB |
| **11** | **4,157,684** | **2.77x** | **2.44 s** | **0.32 s** | **26 MB** | **8 MB** | 4 MB |
| 12 | 4,155,668 | 2.77x | 2.39 s | 0.27 s | 46 MB | 8 MB | 4 MB |
| 13 | 4,257,141 | 2.70x | 3.76 s | 0.27 s | 38 MB | 8 MB | 4 MB |
| 14 | 4,108,558 | 2.80x | 5.39 s | 0.28 s | 54 MB | 8 MB | 4 MB |
| 15 | 3,968,262 | 2.90x | 8.13 s | 0.33 s | 70 MB | 8 MB | 4 MB |
| 16 | 3,862,217 | 2.98x | 11.63 s | 0.26 s | 38 MB | 8 MB | 4 MB |
| 17 | 3,733,198 | 3.08x | 12.39 s | 0.26 s | 58 MB | 10 MB | 8 MB |
| 18 | 3,705,141 | 3.10x | 15.11 s | 0.26 s | 59 MB | 10 MB | 8 MB |
| 19 | 3,449,475 | 3.33x | 27.78 s | 0.28 s | 91 MB | 10 MB | 8 MB |
| 20 | 3,344,642 | 3.44x | 28.24 s | 0.27 s | 195 MB | 34 MB | 32 MB |
| 21 | 3,285,836 | 3.50x | 33.91 s | 0.30 s | 387 MB | 66 MB | 64 MB |
| 22 | 3,245,980 | 3.54x | 49.02 s | 0.30 s | 835 MB | 130 MB | 128 MB |
| level | compressed | ratio | compress | decompress | encoder heap | decoder heap |
| -----: | ------------: | --------: | ---------: | ---------: | -----------: | -----------: |
| 1 | 6,698,281 | 1.72x | 0.54 s | 0.28 s | 8 MB | 8 MB |
| 2 | 6,600,451 | 1.74x | 0.54 s | 0.29 s | 8 MB | 8 MB |
| 3 | 6,094,116 | 1.89x | 0.57 s | 0.28 s | 8 MB | 8 MB |
| 4 | 6,082,362 | 1.89x | 0.61 s | 0.28 s | 8 MB | 8 MB |
| 5 | 5,280,090 | 2.18x | 0.92 s | 0.28 s | 8 MB | 8 MB |
| 6 | 4,943,366 | 2.33x | 1.13 s | 0.27 s | 8 MB | 8 MB |
| 7 | 4,738,515 | 2.43x | 1.27 s | 0.27 s | 9 MB | 8 MB |
| 8 | 4,514,853 | 2.55x | 1.52 s | 0.28 s | 9 MB | 8 MB |
| 9 | 4,445,368 | 2.59x | 1.51 s | 0.26 s | 16 MB | 8 MB |
| **10** | **4,280,567** | **2.69x** | **1.74 s** | **0.27 s** | **26 MB** | **8 MB** |
| 11 | 4,157,684 | 2.77x | 2.44 s | 0.32 s | 26 MB | 8 MB |
| 12 | 4,155,668 | 2.77x | 2.39 s | 0.27 s | 46 MB | 8 MB |
| 13 | 4,257,141 | 2.70x | 3.76 s | 0.27 s | 38 MB | 8 MB |
| 14 | 4,108,558 | 2.80x | 5.39 s | 0.28 s | 54 MB | 8 MB |
| 15 | 3,968,262 | 2.90x | 8.13 s | 0.33 s | 70 MB | 8 MB |
| 16 | 3,862,217 | 2.98x | 11.63 s | 0.26 s | 38 MB | 8 MB |
| 17 | 3,733,198 | 3.08x | 12.39 s | 0.26 s | 58 MB | 10 MB |
| 18 | 3,705,141 | 3.10x | 15.11 s | 0.26 s | 59 MB | 10 MB |
| 19 | 3,449,475 | 3.33x | 27.78 s | 0.28 s | 91 MB | 10 MB |
| 20 | 3,344,642 | 3.44x | 28.24 s | 0.27 s | 195 MB | 34 MB |
| 21 | 3,285,836 | 3.50x | 33.91 s | 0.30 s | 387 MB | 66 MB |
| 22 | 3,245,980 | 3.54x | 49.02 s | 0.30 s | 835 MB | 130 MB |
## Picking a level
**11 is the default**, because it is where the curve flattens. It gives good compression in reasonable time.
**10 is the default**, because it is where the curve flattens. It gives good compression in reasonable time: 11 is only 3% smaller but takes 40% longer.
If there will be troubles with this level in the future, just change it in config.