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Why is the startup with the concurrent low pause (CMS) collector slow?

April 26, 2017CMS Collector concurrent low pause slow startup

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Why is the startup with the concurrent low pause (CMS) collector slow?

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With CMS (+XX:UseConcMarkSweepGC) you sometimes need to set the minimum and maximum heap size to the same value (or at least set a large minimum value) because CMS sometimes spends time early growing its heap. This may also be true of the perm generation. Try a larger perm generation size using the options -XX:PermSize= -XX:MaxPermSize=.