Python vs Java performance runtime speed

Question

Possible Duplicate    is python slower than java C         Ignoring all the characteristics of each languages and focusing SOLELY on speed  which language is better performance-wise   You d think this would be a rather simple question to answer  but I haven t found a decent one   I m aware that some types of operations may be faster with python  and vice-versa  but I cannot find any detailed information on this  Can anyone shed some light on the performance differences

User · Answer

There is no good answer as Python and Java are both specifications for which there are many different implementations  For example  CPython  IronPython  Jython  and PyPy are just a handful of Python implementations out there  For Java  there is the HotSpot VM  the Mac OS X Java VM  OpenJRE  etc  Jython generates Java bytecode  and so it would be using more-or-less the same underlying Java  CPython implements quite a handful of things directly in C  so it is very fast  but then again Java VMs also implement many functions in C  You would probably have to measure on a function-by-function basis and across a variety of interpreters and VMs in order to make any reasonable statement

User · Answer

Different languages do different things with different levels of efficiency   The Benchmarks Game has a whole load of different programming problems implemented in a lot of different languages

User · Answer

Java is faster than Python  Easily   Python is favorable for many things  speed isn t necessarily one of them   References   python org Language Comparisons   C   vs Java vs Python vs Ruby   a first impression A subjective analysis of two high-level  object-oriented languages  Comparing Python to Java

User · Answer

If you ignore the characteristics of both languages  how do you define  SPEED   Which features should be in your benchmark and which do you want to omit   For example    Does it count when Java executes an empty loop faster than Python  Or is Python faster when it notices that the loop body is empty  the loop header has no side effects and it optimizes the whole loop away  Or is that  a language characteristic   Do you want to know how many bytecodes each language can execute per second  Which ones  Only the fast ones or all of them  How do you count the Java VM JIT compiler which turns bytecode into CPU-specific assembler code at runtime  Do you include code compilation times  which are extra in Java but always included in Python     Conclusion  Your question has no answer because it isn t defined what you want  Even if you made it more clear  the question will probably become academic since you will measure something that doesn t count in real life  For all of my projects  both Java and Python have always been fast enough  Of course  I would prefer one language over the other for a specific problem in a certain context

[java] Python vs. Java performance (runtime speed)

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