Problem: digitalobject:regen-derivatives does not release memory

[dersmon]

Current Behavior

Because of #1887 we want to regenerate a lot of thumbnails and reference images for our PDFs.

Starting php symfony digitalobject:regen-derivatives seems to have a memory leak, slowly but steadily increasing memory consumption to the point where the processing crashes with a PHP out of memory error.

Expected Behavior

The memory usage should be more or less stable and not crashing the CLI script.

Possible Solution

For the time being, I am using the --slug option to manually process smaller subsets of our data in order to avoid the memory issue.

I am not sure what causes the memory leak.

Context and Notes

Might be fixed together with #1847.

Version used

AtoM 2.8.2

Operating System and version

Alpine Linux v3.16

Default installation culture

No response

PHP version

PHP 7.4

Contact details

No response