Bug #77536 [Com]: finfo considerably slower on 7.3 vs. 7.2

Edit report at https://bugs.php.net/bug.php?id=77536&edit=1 ID: 77536 Comment by: danack@php.net Reported by: jscaltreto at gmail dot com Summary: finfo considerably slower on 7.3 vs. 7.2 Status: Open Type: Bug Package: Filesystem function related PHP Version: 7.3.1 Block user comment: N Private report: N New Comment: Please could you run the scripts through strace to identify the system call that is causing the difference: https://linux.die.net/man/1/strace Possibly also, although it might be clear to you what the official dockers images are, please could you link to them or name them as they are on docker hub. Or even better provide a Docker compose to run the two things through. Previous Comments: ------------------------------------------------------------------------ [2019-01-28 23:57:04] jscaltreto at gmail dot com Description: ------------ Calls via finfo to lookup mimetype of files take 30%+ longer to run on php 7.3+ than on 7.2. In an extreme case on a cpu-loaded machine I've observed finfo->file() calls taking upwards of 500ms in 7.3, where on the same hardware with the same load the calls typically take <1ms for the same file in 7.2. The included test script can be executed in both 7.2 and 7.3 to illustrate the problem. I've also created a simple test using official docker images to reproduce the issue: https://gist.github.com/jscaltreto/8f6adf38e7abb08a831ef37b84c14ace Test script: --------------- <?php $iters = 1000; $start = microtime(true); for ($i = 1; $i <= $iters; $i++){ $finfo = new finfo(FILEINFO_MIME); $type = $finfo->file("/bin/sh"); unset($finfo); } $ttl = microtime(true) - $start; echo "Took: $ttl\n"; ?> Expected result: ---------------- 7.2 and 7.3 should execute the script in roughly the same amount of time. Actual result: -------------- 7.3 takes 30%+ more time to execute. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77536&edit=1