forked from https://github.com/symfony/symfony
This PR was merged into the 3.3 branch.
Discussion
----------
[VarDumper] Keep and reuse array stubs in memory
| Q | A
| ------------- | ---
| Branch? | 3.3
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | -
| License | MIT
| Doc PR | -
(to be reviewed [ignoring whitespaces](https://github.com/symfony/symfony/pull/23683/files?w=1))
As highlighted by @vtsykun in #23620, the patch in #23644 improves performance but increases the memory usage.
The issue is that even a small `array($k => $v)` consumes more memory than a `new Stub()`.
That's a shame, but since our small arrays have a low variety, we can keep them in a cache and leverage php's COW mechanism to reduce memory. Effectively, this creates a memory leak. But the leak is upper bounded by the data you had already in memory, since that's what is cloned. Looking at the numbers, it looks worth it:
| | 3.3.5 | +#23644 | +this PR
| --- | --- | --- | ---
| Wall Time | 39.4s | 26.1s | ~~18.6s~~ 17.3s
| Memory | 391MB | 539MB | ~~217MB~~ 216MB
https://blackfire.io/profiles/compare/846b58bc-7863-4502-9ca2-f82eebd4173f/graph
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.composer | ||
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src/Symfony | ||
.editorconfig | ||
.gitignore | ||
.php_cs.dist | ||
.travis.yml | ||
appveyor.yml | ||
CHANGELOG-3.0.md | ||
CHANGELOG-3.1.md | ||
CHANGELOG-3.2.md | ||
CHANGELOG-3.3.md | ||
composer.json | ||
CONTRIBUTING.md | ||
CONTRIBUTORS.md | ||
LICENSE | ||
phpunit | ||
phpunit.xml.dist | ||
README.md | ||
UPGRADE-3.0.md | ||
UPGRADE-3.1.md | ||
UPGRADE-3.2.md | ||
UPGRADE-3.3.md | ||
UPGRADE-4.0.md |
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