SPLASH 2014
Mon 20 - Fri 24 October 2014 Portland, Oregon, United States
Fri 24 Oct 2014 11:37 - 12:00 at Salon F - Dynamic Optimization Chair(s): Zachary Tatlock

The HipHop Virtual Machine (HHVM) is a JIT compiler and runtime for PHP. While PHP values are dynamically typed, real programs often have latent types that are useful for optimization once discovered. Some types can be proven through static analysis, but limitations in the ahead-of-time approach leave some types to be discovered at run time. Although many values have latent types, PHP programs can also contain polymorphic variables and expressions, which must be handled without catastrophic slowdown.

HHVM discovers latent types by structuring its JIT around the concept of a tracelet. A tracelet is approximately a basic block specialized for a particular set of run time types for its input values. Tracelets allow HHVM to exactly and efficiently learn the types used by the program, while using a simple compiler. We find HHVM provides high levels of performance, without sacrificing compatibility or interactivity.

Fri 24 Oct

Displayed time zone: Tijuana, Baja California change

10:30 - 12:00
Dynamic OptimizationOOPSLA at Salon F
Chair(s): Zachary Tatlock University of Washington, Seattle
10:30
22m
Talk
Accelerating Iterators in Optimizing AST Interpreters
OOPSLA
Wei Zhang University of California, Irvine, Per Larsen University of California, Irvine, Stefan Brunthaler University of California, Irvine, Michael Franz University of California, Irvine
Link to publication
10:52
22m
Talk
Call Sequence Prediction through Probabilistic Calling Automata
OOPSLA
Zhijia Zhao College of William and Mary / North Carolina State University, Bo Wu College of William and Mary, Mingzhou Zhou College of William and Mary, Yufei Ding College of William and Mary, Jianhua Sun College of William and Mary, Xipeng Shen North Carolina State University, Youfeng Wu Intel Corporation
Link to publication
11:15
22m
Talk
Space-Efficient Multi-Versioning for Input-Adaptive Feedback-Driven Program Optimizations
OOPSLA
Mingzhou Zhou College of William and Mary, Xipeng Shen North Carolina State University, Yaoqing Gao IBM Toronto Labs, Graham Yiu IBM Toronto Labs
Link to publication
11:37
22m
Talk
The HipHop Virtual Machine
OOPSLA
Keith Adams Facebook, Jason Evans Facebook, Bertrand Maher Facebook, Guilherme Ottoni Facebook, Drew Paroski Facebook, Brett Simmers Facebook, Edwin Smith Facebook, Owen Yamauchi Facebook
Link to publication