ReadyNow — an "AOT" with profiling for Java

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Основной разработчик Zing. Эксперт по VM, переехавший недавно в Россию. Для слушателя — редкая возможность прояснить вопросы любой сложности, касающиеся Zing.

The just-in-time (JIT) compilers used by JVMs are marvelous pieces of technology that are crucial to achieving high performance, but they aren't without their downsides. Most notably — warm-up time and deoptimization.

Ahead-of-time (AOT) compilers seem like the obvious answer to these problems. Unfortunately, parts of the Java language and Java ecosystem are hostile to ahead-of-time compilation. And often, AOTs have to sacrifice key optimizations performed by JITs.

ReadyNow is Azul System's solution to these problems that aims to combine the best qualities of a JIT and an AOT. In this talk, we'll dive into the details of Azul's ReadyNow technology. We will look at ReadyNow's impact on warm-up and deoptimization, but we'll also see how ReadyNow solves some of the inherent challenges faced by a Java AOT.