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@ruudk
Created December 8, 2022 15:35
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How to find the files that are the slowest to analyze with PHPStan?

How to find the files that are the slowest to analyze with PHPStan?

For us, PHPStan became a bit slower with every release. We have a very large codebase with 10.000+ classes. There seem to be a few known issues related to big arrays.

See: phpstan/phpstan#8353 phpstan/phpstan#8146

To understand which files are problematic we run the following command:

vendor/bin/phpstan analyze --memory-limit=-1 --debug -vvv | tee phpstan.log

Then we run:

php parse.php
<?php
declare(strict_types=1);
$log = new SplFileObject("phpstan.log");
$logs = [];
$file = null;
while (! $log->eof()) {
$line = trim($log->fgets());
if ($line === '') {
continue;
}
if ($file === null) {
$file = $line;
continue;
}
preg_match('/took (?<seconds>[\d.]+) s/', $line, $matches);
$logs[] = [(float) $matches['seconds'], $file];
$file = null;
}
usort($logs, fn(array $left, array $right) => $right[0] <=> $left[0]);
$logs = array_slice($logs, 0, 100);
echo "Slowest files" . PHP_EOL;
foreach ($logs as $log) {
echo sprintf("%.2f seconds: %s", $log[0], $log[1]) . PHP_EOL;
}
@bcremer
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bcremer commented Dec 20, 2022

Thank you very much @ruudk.

I was able to shave off 2 minutes phpstan runtime (8 minutes to 6 minutes) by excluding module/*/config/module.config.php from the analysis in an Laminas MVC project.

@ruudk
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ruudk commented Dec 20, 2022

@bcremer Happy to hear that!

PHPStan will soon get an option that displays the slow files too.

@szepeviktor
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szepeviktor commented Dec 21, 2022

For those who could use a shell one-liner:

vendor/bin/phpstan analyze --memory-limit=-1 --debug -vvv | sed -e 'N; s#\n# #; s#^\(\S\+\) .* \(\S\+\) s$#\2 \1#; /^ /d' | sort -n

@senki
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senki commented Jan 2, 2023

I made a rust version as part of a learning exercise.

(I hope this self-plug is OK)

@gnutix
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gnutix commented Jun 23, 2023

I got an undefined array key 'seconds' error, fixed by adding this piece of code after the preg_match call :

    if (!array_key_exists('seconds', $matches)) {
        continue;
    }

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