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Clojure High Performance Programming - Second Edition by Shantanu Kumar

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Resorting to Java and native code

In a handful of cases, where the lack of imperative, stack-based, mutable variables in Clojure may make the code not perform as well as Java, we may need to evaluate alternatives to make it faster. I would advise you to consider writing such code directly in Java for better performance.

Another consideration is to use native OS capabilities, such as memory-mapped buffers (http://docs.oracle.com/javase/7/docs/api/java/nio/MappedByteBuffer.html) or files and unsafe operations (http://highlyscalable.wordpress.com/2012/02/02/direct-memory-access-in-java/). Note that unsafe operations are potentially hazardous and not recommended in general. Such times are also an opportunity to consider writing performance-critical ...

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