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That's OPcache they mentioned, a specific language-level cache native to PHP.

https://www.php.net/manual/en/intro.opcache.php

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Ah. Point still stands though, distributed storage is what really unlocks this concept.

Wordpress is a pretty bad example though, surely you’d just CDN cache the pages!

opcache doessn't cache user data. it's for caching bytecode in memory as long as the php script/server is running

i'd like to see a comparison against a firecracker vm and a docker container

Hi, on kraft.cloud we use FC, along with a custom controller and very specialized VMs (unikernels) to have extremely efficient deployments (eg, millisecond cold starts). For a PHP web server, for instance, we can cold start things in about 30ms (https://docs.kraft.cloud/guides/php/). It's also possible to run wasm workloads/blobs (e.g., https://docs.kraft.cloud/guides/wazero/).

The builds are based on Dockerfiles, but for deployment we transparently convert that to unikernels.

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