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.
Conference DayThu 3 NovDisplayed time zone: Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna change
13:30 - 15:10
|Efficient and Thread-Safe Objects for Dynamically-Typed Languages|
Benoit DalozeJKU Linz, Austria, Stefan MarrJohannes Kepler University Linz, Daniele BonettaOracle Labs, Hanspeter MössenböckJKU Linz, AustriaDOI Pre-print Media Attached
|Hybrid STM/HTM for Nested Transactions on OpenJDK|
Keith ChapmanPurdue University, Tony HoskingAustralian National University, Data61, and Purdue University, Eliot MossUniversity of Massachusetts AmherstLink to publication DOI Pre-print Media Attached
|Makalu: Fast Recoverable Allocation of Non-volatile Memory|
OOPSLADOI Pre-print Media Attached
|Prioritized Garbage Collection: Explicit GC Support for Software Caches|
Diogenes NunezTufts University, Sam GuyerTufts University, Emery D. BergerUniversity of Massachusetts, AmherstDOI Pre-print Media Attached