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  Taming Java GC to prevent stutter, an in-depth post on memory management  (Read 2146 times)
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Offline Roquen
« Reply #30 - Posted 2014-04-25 08:23:31 »

The problem is with runtime compiling.  Consider a reference passed to an instance method.  If it's polymorphic you have to check that none of the various methods cause the reference to escape and you have to track it the decomplication framework and reverify each time a new type is loaded which might override the given method (and might be called at the callsite in question).  All of these things are possible, but they don't happen ATM.  Each extra case you add increase the burden on the runtime compiler and tracked by the decompliation framework.  Life's a lot easier if you're AOT.

Tossed this together since at least a couple of people seem interested: http://www.java-gaming.org/topics/escape-analysis/32920/view.html
Offline Spasi
« Reply #31 - Posted 2014-04-25 17:08:49 »

This means DirectByteBuffers in particular, but if you're constructing and forgetting DirectByteBuffers every frame you're not using them as intended anyway.

The problem with direct ByteBuffers has been resolved, by making the allocating thread help with deallocations. Hopefully it'll be backported to JDK 7/8 soon.

This will have an effect on allocation performance, so princec's advice remains important.
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