Compile Java without optimization?

Question

I'm working on some of the problems in Programming Pearls and I'd like to get a sense for the runtime of various programs in Java. However the optimizing compiler is making this difficult. Is there a way to run javac on a Mac without having the compiler make any optimizations?

Any optimizations made by javac are irrelevant, since the JRE will optimize the byte code at run-time. — Andrew Thompson
– Andrew Thompson, Commented Jan 2, 2011 at 7:47
The main optimisation the compiler does is expression evaluations e.g. 1 + 1 => 2 and "hi " + "there" => "hi there". It doesn't change the code. — Peter Lawrey
– Peter Lawrey, Commented Jan 2, 2011 at 9:45

Gareth Davis · Accepted Answer · 2011-01-02 08:05:31Z

9

@Andrew Thompson is correct, the JIT is the main source of optimizations with java.

To run java without the JIT:

 java -Xint ...

answered Jan 2, 2011 at 8:05

Gareth Davis

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Luke Maurer Over a year ago

Yep. In fact, javac does almost no optimization, even in obvious places. (Which of course is why it's fast.)

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