Re: GC Improvements in PHP 7.3.0

Am 07.12.2018 um 16:11 schrieb Christoph M. Becker: > Hi! > > NEWS has the following entry[1]: > > | Improved PHP GC. (Dmitry, Nikita) > > I have not been able to find further info regarding this. So my > question: are these minor improvements, or should they be documented in > the migration guide? If the latter, could somebody please roughly > explain these improvements (are they general performance enhancements, > or only for particular use-cases, or whatever). > > [1] > <https://github.com/php/php-src/blob/php-7.3.0/NEWS#L6> Hi, it's  a huge improvement in some cases, when you have many objects flying around. For example in DomPDF (in an artificial performance test) I saw an improvement from 7 seconds down to 2.7 seconds. It was roughly the same improvement compared to disabling the GC. https://github.com/dompdf/dompdf/issues/1813#issuecomment-429228260 Composer disabled the GC and saw a big performance improvement: https://blog.blackfire.io/performance-impact-of-the-php-garbage-collector.html Maybe with 7.3 they don't have to disable it anymore... I didn't test. Here are some performance numbers from nikic: https://github.com/php/php-src/pull/3165#pullrequestreview-100399813 I would consider it a very nice performance improvement, that can lead to a faster adoption of 7.3 if you do some marketing with it. A 3x or 5x improvement is huge. Would be nice to see numbers when using frameworks, or Wordpress... Michael