[jira] [Created] (SLING-5255) Jobs: allow to configure queue.maxparallel in terms of % of number of CPU cores

["Alexander Klimetschek (JIRA)" <ji...@apache.org>]

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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