Performance Measurement of Dynamically Compiled Java Executions

With the development of dynamic compilers for Java, Java's performance promises to rival that of equivalent C/C++ binary executions. This should ensure that Java will become the platform of choice for ubiquitous Webbased supercomputing. Therefore, being able to build performance tools for dynamically compiled Java executions will become increasingly important. In this paper we discuss those aspects of dynamically compiled Java executions that make performance measurement difficult: (1) some Java application methods may be transformed from byte-code to native code at runtime; and (2), even in native form, application code may interact with the Java virtual machine. We describe Paradyn-J, an experimental version of the Paradyn Parallel Performance Tool that addresses this environment by describing performance data from dynamically compiled executions in terms of the multiple execution forms (interpreted byte-code and directly executed native code) of a method, costs of the dynamic compil..