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Size: 1074
Comment: blurb on dict allocations
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← Revision 12 as of 2009-01-26 05:40:07 ⇥
Size: 1472
Comment: The plots are fixed. Sorry about that.
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| 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 |
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| jbaker & thobe's JavaOne '08 talk: `Jython Implementing Dynamic Language Features For The Java Ecosystem <http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-6039.pdf?cid=925321>`_ | jbaker & thobe's JavaOne '08 talk: `Jython Implementing Dynamic Language Features For The Java Ecosystem`_ |
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| GC Expense ---------- |
Allocation/GC Expense --------------------- |
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| dict allocation ~~~~~~~~~~~~~~~ |
* dicts/stringmap |
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| Frame creation -------------- |
* Frames |
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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 .. _`Jython Implementing Dynamic Language Features For The Java Ecosystem`: http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-6039.pdf?cid=925321 |
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
Ideas
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