How can I measure the CPU time a Clojure function takes to execute?
I have seen profiling macros for Clojure but they all seem to use elapsed time. Is there any way to get the CPU time taken?
Not seen such a solution.
However, you can probably achieve it with the java.lang.management Java package which supports management / monitoring of the JVM.
In particular, the ThreadMXBean.getCurrentThreadCPUTime() sounds like it would do what you want.
Normally however I would just try and run my benchmark in an uncontested environment (ie one where it can get 100% CPU) and make the simplyfying assumption that elapsed time is approximately equal to CPU time. Then you can use the usual Clojure benchmarking tools, eg Criterium.
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