GC Improvements in PHP 7.3.0

Am 07.12.2018 um 16:11 schrieb Christoph M. Becker:

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

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...

Thanks! Then it should definitely be mentioned in the migration guide.
I'll see to it.

--
Christoph M. Becker