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Practical Debugging and Performance Pro fi ling #PHPDD23

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Photo by Stackie Jia on Unsplash Flow in which a person [….] is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity.

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{ "name": "neos/neos-development-distribution", "description": "Neos Development Distribution", "license": "GPL-3.0-or-later", "support": { "email": "[email protected]", "slack": "http://slack.neos.io/", "forum": "https://discuss.neos.io/", "wiki": "https://discuss.neos.io/c/the-neos-project/project-documentation", "issues": "https://github.com/neos/neos-development-collection/issues", "docs": "http://neos.readthedocs.io/", "source": "https://github.com/neos/neos-development-distribution" }, "config": { "vendor-dir": "Packages/Libraries", "bin-dir": "bin", "preferred-install": { "neos/*": "source", "flowpack/*": "source" }, "allow-plugins": { "neos/composer-plugin": true } }, "require": { "neos/neos-development-collection": "8.0.x-dev", "neos/flow-development-collection": "8.0.x-dev", "neos/demo": "8.0.x-dev", "neos/neos-ui": "8.0.x-dev", "neos/neos-ui-compiled": "8.0.x-dev", "neos/fusion-form": "@dev", "neos/party": "@dev", "neos/seo": "@dev", "neos/imagine": "@dev", "neos/twitter-bootstrap": "@dev", "neos/form": "@dev", "neos/setup": "@dev", "flowpack/neos-frontendlogin": "@dev", "mikey179/vfsstream": "^1.6", "phpunit/phpunit": "^9.0", "symfony/css-selector": "^2.0", "symfony/css-selector": "^2.0", "vimeo/psalm": "~4.9.3", "neos/doctools": "^3.3" }, "repositories": { "distributionPackages": { "type": "path", "url": "./DistributionPackages/*" } }, "suggest": { "ext-pdo_sqlite": "For running functional tests out-of-the-box th }, "scripts": { "post-create-project-cmd": "./flow welcome", "post-update-cmd": "Neos\\Flow\\Composer\\InstallerScripts::postU "post-install-cmd": "Neos\\Flow\\Composer\\InstallerScripts::post "post-package-update": "Neos\\Flow\\Composer\\InstallerScripts::p "post-package-install": "Neos\\Flow\\Composer\\InstallerScripts:: "test-unit": "phpunit -c Build/BuildEssentials/PhpUnit/UnitTests. "test-functional": "phpunit -c Build/BuildEssentials/PhpUnit/Func "test-static-flow": "psalm --config=Packages/Framework/psalm.xml "psalm-baseline-update-flow": "psalm --config=Packages/Framework/ Framework/psalm-baseline.xml" }, "require-dev": { "neos/behat": "8.0.x-dev", "neos/buildessentials": "8.0.x-dev" } }

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? ???

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"bin-dir": "bin", "preferred-install": { "neos/*": "source", "flowpack/*": "source" }, "allow-plugins": { "neos/composer-plugin": true } }, "require": { "neos/neos-development-collection": "8.0.x-dev", "neos/flow-development-collection": "8.0.x-dev", "neos/demo": "8.0.x-dev", "neos/neos-ui": "8.0.x-dev", "neos/neos-ui-compiled": "8.0.x-dev", "neos/fusion-form": "@dev", "neos/party": "@dev", "neos/seo": "@dev", "neos/imagine": "@dev", "neos/twitter-bootstrap": "@dev", "neos/form": "@dev", "neos/setup": "@dev", "flowpack/neos-frontendlogin": "@dev", "mikey179/vfsstream": "^1.6", "phpunit/phpunit": "^9.0",

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OSX Host System Docker Container(s) fi le mounts my model of reality

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OSX Host System Linux Virtual Machine Docker Container(s) mounts no problem, without performance hit normal mounts not possible, !!! lots of workarounds for emulating mounting SLOW sshfs gRPC-fuse virtiofs reality

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OSX Host System Linux Virtual Machine Docker Container(s) application source code cache fi les vendored source code

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Method

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Stable Foundation Hypothesis Design Experiment Execute Experiment Valid Knowledge write it down must give 100% reliable results

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Unstable Foundation Modify some things in the codebase "which might improve things" do roughly the same steps, but not exactly

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Use Production Data for Debugging / Pro fi ling prepare for non-linear behavior

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What tools do we have available to design experiments? ... to generate validated knowledge

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var_dump() die() am I in the right codebase? (die() in entrypoint) 
 am I in the right fi le? 
 is the opcache caching too agressively? 
 how often is this method called?

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drydock execroot: enter a container as root

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kill -USR2 [php-fpm] modify server con fi g re-read the PHP con fi g and restart

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function B.2 throw new \RuntimeException("FOO"); read a stack trace function A function B.1 function C function main function main() { a() } function a() { b1(); b2(); } function b1() { c () } Stack

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throw new \RuntimeException("FOO"); read a stack trace

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xdebug_break() drydock xdebug [container] install xdebug into a running container

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My code is slow...

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Flame Graph

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PHP-SPX

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PHP-SPX drydock spx [container] install spx into a running container

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Linux Kernel your program File IO System Calls Network IO current time

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strace apt-get install strace (as root) strace -p [pid]

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bpftrace

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bpftrace

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Summary

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Stable Foundation Hypothesis Design Experiment Execute Experiment Valid Knowledge write it down run an experiment to establish foundation must give 100% reliable results

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Thanks! Daniel Kahnemann: Thinking Fast and Slow xdebug, PHP-SPX github: sandstorm/drydock github: sandstorm/ebpf-tracer

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