Thursday, July 4, 2013

Java : Garbage Collection in Java (3)

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Concurrent Mark Sweep

The parallel garbage collectors in Hotspot are designed to minimise the amount of time that the application spends undertaking garbage collection, which is termed throughput. This isn't an appropriate tradeoff for all applications - some require individual pauses to be short as well, which is known as a latency requirement.

The Concurrent Mark Sweep (CMS) collector is designed to be a lower latency collector than the parallel collectors. The key part of this design is trying to do part of the garbage collection at the same time as the application is running. This means that when the collector needs to pause the application's execution it doesn't need to pause for as long.

At this point you're probably thinking 'don't parallel and concurrent mean something fairly similar?' Well in the context of GC Parallel means "uses multiple threads to perform GC at the same time" and Concurrent means "the GC runs at the same time as the application its collecting".

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