Professional AssociationsProfessional Associations: ACM | Information Processing Society of Japan (IPSJ)
- Code Patch to the STAMP Benchmarks for Hardware Transdactional Memory (HTM)
- IISWC 2014 Paper
- PPoPP 2014 Paper
- IISWC 2013 Paper
- Research Report: Eliminating GIL in Ruby through HTM
- ASPLOS 2012 Paper
- CGO 2010 Paper
- VEE 2010 Paper
- ISCA 2015 Paper
- Code Patch to Eliminate Global Interpreter Lock (GIL) in Ruby through Hardware Transactional Memory
PPoPP 2014 Paper
Eliminating Global Interpreter Locks in Ruby through Hardware Transactional Memory
Rei Odaira, Jose G. Castanos, and Hisanobu Tomari.
In Proceedings of the 19th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP), pp.131--142, 2014.
Many scripting languages use a Global Interpreter Lock (GIL) to simplify the internal designs of their interpreters, but this kind of lock severely lowers the multi-thread per-formance on multi-core machines. This paper presents our first results eliminating the GIL in Ruby using Hardware Transactional Memory (HTM) in the IBM zEnterprise EC12 and Intel 4th Generation Core processors. Though prior prototypes replaced a GIL with HTM, we tested real-istic programs, the Ruby NAS Parallel Benchmarks (NPB), the WEBrick HTTP server, and Ruby on Rails. We devised a new technique to dynamically adjust the transaction lengths on a per-bytecode basis, so that we can optimize the likelihood of transaction aborts against the relative overhead of the instructions to begin and end the transactions. Our results show that HTM achieved 1.9- to 4.4-fold speedups in the NPB programs over the GIL with 12 threads, and 1.6- and 1.2-fold speedups in WEBrick and Ruby on Rails, respectively. The dynamic transaction-length adjustment chose the best transaction lengths for any number of threads and applications with sufficiently long running times.
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