https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=27756
Bug ID: 27756
Summary: background_jobs_worker.pl is memory inefficient
Change sponsored?: ---
Product: Koha
Version: master
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5 - low
Component: Architecture, internals, and plumbing
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Once Perl allocates memory, it doesn't return that memory to the Operating
System for the life of that Perl process. If memory is freed within a Perl
program (nullifying a variable, for instance), that memory will be re-used
within the Perl program, but it will not return the memory. This can cause
unexpected excessive memory consumption for long-running Perl programs.
misc/background_jobs_worker.pl runs all its code within the same process, so it
will never return allocated memory. This means that 1 large background import
could cause background_jobs_worker.pl to permanently use a large amount of
memory (until it is restarted).
The solution is to do the background work within a forked process. I was
reminded of this when I read "The worker process will fork a new process for
every job that is being processed. This allows for resources such as memory to
be returned to the operating system once a job is finished. Perl fork is very
fast, so don't worry about the overhead" at
https://docs.mojolicious.org/Minion.
It's the same premise as bug 27267.
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