Hi Dustin and thanks for this bug report. Benchmarking is difficult and
repeating one single operation several time is often not a good
performance indicator, however I agree we shouldn't see such a huge
difference. I can reproduce it too as follows:
1. Launch a Focal LXD container
2. apt install php
3. Run `php test.php` (your test script, unmodified). On my machine this it
runs in about 1.5s.
Now in docker:
4. mkdir php-perf-test, copy test.php in this directory and create a
Dockerfile containing the following:
FROM php:7.4-cli
COPY . /tmp/php
WORKDIR /tmp/php
CMD [ "php", "./test.php" ]
5. Run: `docker build -t my-php-app .`
6. Run: `docker run -it --rm --name my-running-app my-php-app`. The test script
runs in about 0.25 in this case, on the same machine.
Version info for the Ubuntu packaged PHP:
$ apt policy php7.4
php7.4:
Installed: 7.4.3-4ubuntu2.2
$ php --version
PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
while the Docker version is:
$ docker run -it --rm --name my-running-app my-php-app php --version
PHP 7.4.6 (cli) (built: May 15 2020 12:47:30) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
This is worth some more investigation.
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https://bugs.launchpad.net/bugs/1882279
Title:
PHP from the official Docker image performs much better than the
Ubuntu packaged version
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