Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?

Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?

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multithreading

Green-threads and thread in Python

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multithreading

numpy and Global Interpreter Lock

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multithreading

Python Global Interpreter Lock (GIL) workaround on multi-core systems using taskset on Linux?

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multithreading

Python performance - best parallelism approach

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multithreading

Embedding python in multithreaded C application

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multithreading

GIL in Python 3.1

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multithreading

Does using the subprocess module release the python GIL?

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multithreading

Why are numpy calculations not affected by the global interpreter lock?

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multithreading

sys.setswitchinterval in Python 3.2 and beyond

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multithreading

How can I check whether a thread currently holds the GIL?

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multithreading

Is the Python GIL really per interpreter?

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multithreading

Does a multithreaded crawler in Python really speed things up?

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multithreading

Why does multithreading do not speed up parsing HTML with lxml?

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multithreading

Why Python is not better in multiprocessing or multithreading applications than Java?

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multithreading