PHP CLI in the background behaving badly. That applies "in a hurry", well-behaved BASH, Perl and Python.
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In the task where it was necessary to preserve resources, did
1. The PHP script stores the "job" to BASH in some directory job
2. Kron-the-minute launches a dispatcher script, written in Perl (was a viable option and BASH) who is looking for a N the oldest (by time last modified) scripts from the directory job, and launches them.
3. Run the scripts the first thing destroy (rm) himself, that They still are — because they are already loaded in RAM. The results are stored in filesystem or in a database, to service interface logic
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The number N for each server detected individually by testing.
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Was "rock bottom" which at first never even was discovered quite time — everything runs Kron should work with absolute paths.
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So had to do a project like YouTube and similar, also converting videos.