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Why is fragmentation a potential problem for the concurrent low pause collector?

April 26, 2017Collector concurrent fragmentation low pause potential problem

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Why is fragmentation a potential problem for the concurrent low pause collector?

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Normally the concurrent low pause collector does not copy nor compact the live objects. A garbage collection is done without moving the live objects. If fragmentation becomes a problem, allocate a larger heap. In 1.4.2 if fragmentation in the tenured generation becomes a problem, a compaction of the tenured generation will be done although not concurrently. In 1.4.1 that compaction will occur if the UseCMSCompactAtFullCollection option is turned on.