reduce result cache use via collectors

[staabm]

just a heads up, as I found today that collector classes of dead-code detect will accumulate a lot of data in the resultCache.php file:

I did not look into details, but it would be great when possible to reduce the data collected to a minimum.

every property saved could lead to a big reduction because these items appear very often in the result cache (depending on project size)

removing dead-code-detector from phpstan-src reduces the resultCache.php file by ~65%

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my observation is based on dead code detector 0.12.2 which is the one we use atm in phpstan-src

[janedbal]

I know it and I actually did many improvements already, but the nature of DCD is to know all definitions, calls and fetches. And that is a lot of data. There is some improvement possible, but imo not much (e.g. via compression).

See e.g.:

• Collected data: reduce memory consumption & result cache size phpstan/phpstan-src#3879 (main)
• Optimize collected data size #168
• ClassMemberUsage: custom serialization logic #124 (old)

[staabm]

Phpstan is already cpu bound. Shifting even more work onto the cpu (what compression would do) is not a good option IMO.

I have no better idea though atm