Octane | 2x RAM usage vs FPM

[ad-mos]

Hi, is that correct behaviour that Octane on Swoole uses 2-3x more ram than PHP-FPM for the same amount of workers?

Octane (Swoole):

Octane (Franken PHP):

PHP FPM:

[henzeb]

Since octane and swoole have long running processes (with your application loaded the entire time), I'd say that is normal.

[robert-moore96]

that is kinda the point

the various Octane drivers load and parse your app into memory on startup, and then share/resuse that for multiple requests,
while FPM or Apache mod php will load and parse your app at the start of every request and then clear it at the end of the request

depending on the app and things being set up correctly you would need far more FPM workers to achieve the same rps as Octane

in practice i have found that in terms of raw performance, with a fast ssd i dont really feel much difference between them, but on spinning rust i dont even bother trying FPM the difference is so big

also because it is keeping your app running it allows for extra things which FPM doesnt natively support like websockets / db connection pooling

[ad-mos]

But it doesn't apply to Franken PHP, memory usage similar to FPM

[robert-moore96]

maybe FrankenPHP is just more efficient in general, or maybe it is deferring some loading, idk?

i dont have any experience at all with FrankenPHP other than a quick read of there docs, i currently use openswoole

imo the real comparison would be how much memory they use when under load though, use k6 or something to simulate a bunch of users and see how they respond

i would also look into how many workers are needed by each to achieve a given number of requests, the "workers" arent necasarily equivilent,

eg by default swoole will run 1 worker per cpu core, according to its docs frankenphp will run 2 per core, it looks like you asked them to run 30x

tbh im not sure i believe that it is actually running the full 60, as i have several different laravel apps running on octane/openswoole and they sit around 300MB RAM for 4 workers but maybe there is something going on there