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Reduce marshal and unmarshal overhead (#1044)

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* Reduce marshal and unmarshal overhead

Targeted optimizations to reduce performance overhead introduced by
recent feature additions and the unsafe removal.

Unmarshal:
- parseKeyval: access the node directly in the builder's slice to set
  Raw, bypassing NodeAt which triggers a GC write barrier for the
  nodes-pointer on every key-value expression.
- Iterator.Next: cache the *nodes slice dereference in a local variable
  to avoid repeated pointer-to-slice indirection in the hot loop.

Marshal:
- Guard shouldOmitZero calls with an inlineable options.omitzero check.
  shouldOmitZero has inlining cost 1145 (budget 80), so avoiding the
  function call when omitzero is not set removes per-field overhead.
- Inline the isNil check in encodeMap. isNil has inlining cost 93
  (budget 80), so expanding it at the single hot call site avoids
  per-map-entry function call overhead.

Update README benchmarks.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Thomas Pelletier
2026-03-24 07:08:39 -04:00
committed by GitHub
parent 77f3862df4
commit f36a3ece9e
4 changed files with 50 additions and 42 deletions
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README.md
+27 -27
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@@ -235,17 +235,17 @@ the AST level. See https://pkg.go.dev/github.com/pelletier/go-toml/v2/unstable.
Execution time speedup compared to other Go TOML libraries:
<table>
<thead>
<tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
</thead>
<tbody>
<tr><td>Marshal/HugoFrontMatter-2</td><td>2.1x</td><td>2.0x</td></tr>
<tr><td>Marshal/ReferenceFile/map-2</td><td>1.9x</td><td>2.0x</td></tr>
<tr><td>Marshal/ReferenceFile/struct-2</td><td>2.3x</td><td>2.5x</td></tr>
<tr><td>Unmarshal/HugoFrontMatter-2</td><td>3.4x</td><td>2.8x</td></tr>
<tr><td>Unmarshal/ReferenceFile/map-2</td><td>3.0x</td><td>3.0x</td></tr>
<tr><td>Unmarshal/ReferenceFile/struct-2</td><td>4.9x</td><td>5.1x</td></tr>
</tbody>
<thead>
<tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
</thead>
<tbody>
<tr><td>Marshal/HugoFrontMatter-2</td><td>2.1x</td><td>2.0x</td></tr>
<tr><td>Marshal/ReferenceFile/map-2</td><td>2.0x</td><td>2.0x</td></tr>
<tr><td>Marshal/ReferenceFile/struct-2</td><td>2.3x</td><td>2.5x</td></tr>
<tr><td>Unmarshal/HugoFrontMatter-2</td><td>3.3x</td><td>2.8x</td></tr>
<tr><td>Unmarshal/ReferenceFile/map-2</td><td>2.9x</td><td>3.0x</td></tr>
<tr><td>Unmarshal/ReferenceFile/struct-2</td><td>4.8x</td><td>5.0x</td></tr>
</tbody>
</table>
<details><summary>See more</summary>
<p>The table above has the results of the most common use-cases. The table below
@@ -253,22 +253,22 @@ contains the results of all benchmarks, including unrealistic ones. It is
provided for completeness.</p>
<table>
<thead>
<tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
</thead>
<tbody>
<tr><td>Marshal/SimpleDocument/map-2</td><td>2.0x</td><td>2.9x</td></tr>
<tr><td>Marshal/SimpleDocument/struct-2</td><td>2.5x</td><td>3.5x</td></tr>
<tr><td>Unmarshal/SimpleDocument/map-2</td><td>4.3x</td><td>3.5x</td></tr>
<tr><td>Unmarshal/SimpleDocument/struct-2</td><td>5.9x</td><td>4.5x</td></tr>
<tr><td>UnmarshalDataset/example-2</td><td>3.2x</td><td>2.9x</td></tr>
<tr><td>UnmarshalDataset/code-2</td><td>2.4x</td><td>2.9x</td></tr>
<tr><td>UnmarshalDataset/twitter-2</td><td>2.7x</td><td>2.5x</td></tr>
<tr><td>UnmarshalDataset/citm_catalog-2</td><td>2.1x</td><td>2.1x</td></tr>
<tr><td>UnmarshalDataset/canada-2</td><td>1.9x</td><td>1.5x</td></tr>
<tr><td>UnmarshalDataset/config-2</td><td>5.4x</td><td>3.1x</td></tr>
<tr><td>geomean</td><td>2.9x</td><td>2.8x</td></tr>
</tbody>
<thead>
<tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
</thead>
<tbody>
<tr><td>Marshal/SimpleDocument/map-2</td><td>2.0x</td><td>2.9x</td></tr>
<tr><td>Marshal/SimpleDocument/struct-2</td><td>2.5x</td><td>3.6x</td></tr>
<tr><td>Unmarshal/SimpleDocument/map-2</td><td>4.2x</td><td>3.4x</td></tr>
<tr><td>Unmarshal/SimpleDocument/struct-2</td><td>5.9x</td><td>4.4x</td></tr>
<tr><td>UnmarshalDataset/example-2</td><td>3.2x</td><td>2.9x</td></tr>
<tr><td>UnmarshalDataset/code-2</td><td>2.4x</td><td>2.8x</td></tr>
<tr><td>UnmarshalDataset/twitter-2</td><td>2.7x</td><td>2.5x</td></tr>
<tr><td>UnmarshalDataset/citm_catalog-2</td><td>2.3x</td><td>2.3x</td></tr>
<tr><td>UnmarshalDataset/canada-2</td><td>1.9x</td><td>1.5x</td></tr>
<tr><td>UnmarshalDataset/config-2</td><td>5.4x</td><td>3.0x</td></tr>
<tr><td>geomean</td><td>2.9x</td><td>2.8x</td></tr>
</tbody>
</table>
<p>This table can be generated with <code>./ci.sh benchmark -a -html</code>.</p>
</details>