Spike RAM and CPU usage after deploy #2215
Description
What happened?
Hi!
I tested frankenphp in production environment. using the classic mode as drop-in replacement of fpm.
Durning the 5 days of test. I see a good performance and resource wise usage. with tweaking the config based on the doc and the help of contributors here.
I see an issue happen when I deploy a new version of the app. I'm using Ansistrano tools for deployment. using the symlink strategy for ~zero-down-time.
In deploying I saw sometimes the CPU stagnated at 100% (Happened the server is busy to handle requests). Also the RAM increased.
I usually see the spike as normal since the deploy phase need CPU/ RAM to build the app as old-fashioned method. but Ii need to cool-down after the deploy finished. but It doesn't happen when using franakenphp.
This a normal workload of normal day:
Memory usage is seem stable
This is issue happen when I deploy :
The app is a classic Laravel (InertiaJs + Vue ).
I searched for the issue, I got the resolve_root_symlink can be harmful in our case.
"The 100% CPU spike is almost certainly a "cache thrashing" event where the engine is recursively trying to resolve paths that changed underneath it." LLM.
"resolve_root_symlink can actually cause a race condition during the exact millisecond Ansistrano runs ln -sfn." LLM
I tried to disable resolve_root_symlink (since it enabled by default in frankenphp). and using reload (service frankenphp reload) frankenphp service but still the issue persist .
It resolved only when I restart the frankenphp service (service frankenphp restart). Then the CPU/RAM usage cool down as normal usage.
As seeing in this graph.
FrankenPHP v1.11.2 PHP 8.4 Caddy v2.10.2 h1:g/gTYjGMD0dec+UgMw8SnfmJ3I9+M2TdvoRL/Ovu6U8=
PHP 8.4.18 (cli) (built: Feb 13 2026 15:32:33) (ZTS gcc 10.2.1 x86_64) Copyright (c) The PHP Group Built by Static PHP <https://static-php.dev> #StandWithUkraine Zend Engine v4.4.18, Copyright (c) Zend Technologies with Zend OPcache v8.4.18, Copyright (c), by Zend Technologies
Ubuntu 24.04 . Installed frankenphp by apt.
Caddyfile. I tested both with resolve_root_symlink and resolve_root_symlink false.
{
metrics
frankenphp {
num_threads 16
max_threads auto
max_wait_time 30s
php_ini {
upload_max_filesize 50M
post_max_size 50M
memory_limit 256M
expose_php 0
}
}
}
example.com {
import security.conf
root * /var/www/html/current/public
encode zstd gzip
request_body {
max_size 50MB
}
php_server {
try_files {path} index.php
resolve_root_symlink
}
log {
output file /var/log/caddy/access.log
format json
}
}Any thought please?
Thank you,!
Build Type
deb packages
Worker Mode
No
Operating System
GNU/Linux
CPU Architecture
x86_64
PHP configuration
-