Efficient and thread-safe objects for dynamically-typed languages

Abstract

We are in the multi-core era. Dynamically-typed languages are in widespread use, but their support for multithreading still lags behind. One of the reasons is that the sophisticated techniques they use to efficiently represent their dynamic object models are often unsafe in multithreaded environments. This paper defines safety requirements for dynamic object models in multithreaded environments. Based on these requirements, a language-agnostic and thread-safe object model is designed that maintains the efficiency of sequential approaches. This is achieved by ensuring that field reads do not require synchronization and field updates only need to synchronize on objects shared between threads. Basing our work on JRuby+Truffle, we show that our safe object model has zero overhead on peak performance for thread-local objects and only 3% average overhead on parallel benchmarks where field updates require synchronization. Thus, it can be a foundation for safe and efficient multithreaded VMs for a wide range of dynamic languages.

Study of Energy-Efficient Optimization Techniques for High-Level Homogeneous Resource Management

“…Wireless Communications and Mobile Computing managed programs is supported by approaches like Espresso [22]. Nowadays, C++ programs, as opposed to C programs, make extensive use of dynamic memory for short-term allocations, which often results in faster access to objects and thus increases program efficiency [23]. In comparison to C programs, studies have shown that C++ programs invoke dynamically created objects much faster and with fewer errors [24].…”