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if you mean clojure AOT, it precompiles clojure to jvm bytecode. Usually the term JIT in this context is used to describe the native code generated by the VM on the flight, not the on the flight VM bytecode generation performed by a higher level language like clojure.

EDIT: sorry, probably your referred to http://publib.boulder.ibm.com/infocenter/java7sdk/v7r0/topic...

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According to this link precompilation with AOT produces worse results than normal JIT execution. If so, what is AOT useful for?

"Da AOT-Code über verschiedene Programmausführungen hinweg bestehen bleiben muss, ist die Leistung von mit AOT generiertem Code nicht so gut wie die von mit JIT generiertem Code."

It helps with startup time. It's not that it produces worse code, it's that there's multiple levels of compilation. It stores the equivalent of -O1 on disk, and eventually some of the code can ramp up to -O3+. This is almost entirely to help startup time so that you don't have a bunch of code trying to compile during startup.

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