forked from https://github.com/symfony/symfony
21d98d43c4
This PR was merged into the 3.3 branch.
Discussion
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[VarDumper] Dont use Stub objects for arrays - lower GC pressure
| Q | A
| ------------- | ---
| Branch? | 3.3
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | #23644
| License | MIT
| Doc PR | -
Several recent profiles have shown that VarDumper triggers the garbage collector quite often, leading to high CPU usage. The reason for this is that internally, VarCloner creates one Stub object per array+object+resource.
This PR removes the need for Stub objects for each arrays, replacing them with stub arrays. This should almost remove the GC pressure, since the number of Stub objects now has the same magnitude than the number of dumped objects.
Meanwhile, this PR removes any use of the `symfony_debug` extension, which is mostly useless anyway. This helps make the code simpler (really :) ), thus helps maintenance (eg merging up to master.)
I also changed the values of the constants defined in the Stub class, and removed the corresponding Data::mapStubConsts() method. Since the serialized format has changed (and we have to do it as there is no other way to fix this GC issue), there is no need to keep any sort of compat mapping there.
Commits
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| .composer | ||
| .github | ||
| 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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