Thursday, July 4, 2013

Java : Garbage Collection in Java (1)

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This is the first in a series of posts about Garbage Collection (GC). I hope to be able to cover a bit of theory and all the major collectors in the hotspot virtual machine over the course of the series. This post just explains what garbage collection is and elements common to different collectors.

Why should I care?

Your Java virtual machine manages memory for you - which is highly convenient - but it might not be optimally tuned by default. By understanding some of the theory behind garbage collection you can more easily tune your collector. A common concern is collector efficiency, that is to say how much time your program spends executing program code rather than collecting garbage. Another common concern is long that application pauses for.

There's also a lot of hearsay and folklore out there about garbage collection and so understanding the algorithms in a bit more detail really helps avoid falling into common pitfalls and traps. Besides - for anyone interested in how computer science principles are applied and used, JVM internals are a great thing to look at.

Read more here

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