Differences between revisions 11 and 12
Revision 11 as of 2009-01-12 01:11:16
Size: 1465
Editor: PhilipJenvey
Comment: more modules that could benefit from being written in java
Revision 12 as of 2009-01-26 05:40:07
Size: 1472
Editor: c-98-212-140-18
Comment: The plots are fixed. Sorry about that.
Deletions are marked like this. Additions are marked like this.
Line 8: Line 8:
Benchmark plots (currently broken): http://freya.cs.uiuc.edu/~njriley/plots.html Plots of microbenchmarks (also from PyPy): http://freya.cs.uiuc.edu/~njriley/plots.html

Performance Enhancements Resources

Jython benchmarks (from PyPy's suite): http://freya.cs.uiuc.edu/~njriley/benchmark.html

Plots of microbenchmarks (also from PyPy): http://freya.cs.uiuc.edu/~njriley/plots.html


jbaker & thobe's JavaOne '08 talk: Jython Implementing Dynamic Language Features For The Java Ecosystem

Allocation/GC Expense

Our algorithms are not always the problem, sometimes it's memory {de}allocations that slow you down

  • dicts/stringmap

PyStringMap/PyDictionary pay a penalty on allocation now that they're backed by ConcurrentHashMap. We could probably tweak the ConcurrentHashMap initialCapacity, concurrentLevel to reduce this cost

  • Frames

Frames are allocated for every Python method call, which is a GC expense. CPython (and JRuby?) recycle frame objects. Reducing the number of fields on the frame can also help (but this likely isn't possible)

Advanced Compiler

Modules to rewrite in Java

  • _heapq
  • select
  • socket
  • unicodedata

iterlen support

Adds a length hint to various objects, mainly for smarter allocation during map and list. See test_iterlen

PerformanceEnhancements (last edited 2009-01-26 05:40:07 by c-98-212-140-18)