Software

Exploiting Task Order Information for Optimizing Sequentially Consistent Java Programs

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Executive Summary

Java was designed as a secure language that supports running untrusted code as part of trusted applications. For safety reasons, Java therefore defines a memory model that prevents undefined behavior in multi-threaded programs even if the programs are not correctly synchronized. Because of the potential negative performance impact the Java designers did not choose a simple and natural memory model, such as sequential consistency, but instead developed a relaxed memory model that gives the compiler more optimization opportunities. As it is today, however, the relaxed Java Memory Model is not only hard to understand, but it unnecessarily complicates reasoning about parallel programs and it turned out to be difficult to implement correctly.

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