Alexander Klimetschek created SLING-5255:
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Summary: Jobs: allow to configure queue.maxparallel in terms of %
of number of CPU cores
Key: SLING-5255
URL: https://issues.apache.org/jira/browse/SLING-5255
Project: Sling
Issue Type: Improvement
Components: Extensions
Reporter: Alexander Klimetschek
The {{queue.maxparallel}} setting (how many concurrent threads can run for a
given job queue) currently supports a fixed number of threads or -1 which means
"as many CPU cores present on the machine". The latter is in our case used as a
crucial default, but it's too aggressive, since it might take over all CPU
processing.
Since every machine has different numbers of CPUs and cores, it would be useful
to express this config as % of number of CPU cores. This allows for example for
a default setting of 50% that should work well on different machines without
having to manually configure it on each instance.
This could either be a separate setting or (better) maybe allow floating point
numbers between 0.0 and 1.0 to express the percentage for the existing
{{queue.maxparallel}}. E.g. 0.5 means 50% of the cores. If it's an integer,
continue to use it as an exact number of threads to use.
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