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compress: headings

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Motiejus Jakštys 2024-08-07 15:09:57 +03:00
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content/log/2024/web-compression.md
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@ -14,8 +14,7 @@ FUDing it. If I were the PR submitter, I would certainly not appreciate this
comment. So I decided to conduct a non-scientific experiment: take a big piece comment. So I decided to conduct a non-scientific experiment: take a big piece
of Javascript and compare brotli with zstd. of Javascript and compare brotli with zstd.
Executive Summary # Executive Summary
-----------------
* brotli compresses my chosen piece of Javascript better than zstd by 4-22%. * brotli compresses my chosen piece of Javascript better than zstd by 4-22%.
* zstd is faster than brotli by 50-80% (depending on platform) and uses less * zstd is faster than brotli by 50-80% (depending on platform) and uses less
@ -44,8 +43,7 @@ Software:
- brotli 1.1.0 from the distribution. - brotli 1.1.0 from the distribution.
- zstd v1.5.6 from the distribution. - zstd v1.5.6 from the distribution.
Test Harness # Test Harness
------------
I picked Youtube's `desktop_polymer.js`, because: I picked Youtube's `desktop_polymer.js`, because:
@ -87,12 +85,11 @@ esac
Then symlink to it for each compression level: Then symlink to it for each compression level:
``` ```
$ for l in 3 6 19 22; do ln -s wrap zstd-${l}; done $ for l in 3 6 9 19 22; do ln -s wrap zstd-${l}; done
$ ln -s wrap brotli $ ln -s wrap brotli
``` ```
Compression Ratio # Compression Ratio
-----------------
``` ```
Filename Bytes % larger that br Filename Bytes % larger that br
@ -114,8 +111,7 @@ itself somewhat of an advantage over other compressors for this corpus.
Since `zstd -19` and `zstd -22` yield the same compression ratio, there is no Since `zstd -19` and `zstd -22` yield the same compression ratio, there is no
point going ultra, I will exclude `zstd -22` from the tests. point going ultra, I will exclude `zstd -22` from the tests.
Decompression Speed # Decompression Speed
-------------------
``` ```
hyperfine --export-markdown $(hostname) -w 1 -N ./zstd-{3,6,9,19} ./brotli hyperfine --export-markdown $(hostname) -w 1 -N ./zstd-{3,6,9,19} ./brotli
@ -145,8 +141,7 @@ hyperfine --export-markdown $(hostname) -w 1 -N ./zstd-{3,6,9,19} ./brotli
Summary: `zstd -6` is fastest, brotli is slower by 50-80%. Summary: `zstd -6` is fastest, brotli is slower by 50-80%.
Memory Usage # Resource Usage
------------
``` ```
poop ./zstd-{6,3,9,19} ./brotli poop ./zstd-{6,3,9,19} ./brotli