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Size: 642
Comment:
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Size: 1465
Comment: more modules that could benefit from being written in java
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| GC Expense ---------- Our algorithms are not always the problem, sometimes it's memory allocations that slow you down |
jbaker & thobe's JavaOne '08 talk: `Jython Implementing Dynamic Language Features For The Java Ecosystem`_ |
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| Frame creation -------------- |
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 |
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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
Benchmark plots (currently broken): 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