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CPython uses a Global Interpreter Lock. Linux has removed all traces of the Big Kernel Lock. What is the alternative to these locks? How can a system make full use of a truly multi-core or multi-processor system without grinding everything to a halt?
A GIL wouldn’t be necessary if python used a more advanced Garbage Collector like IBM’s Recycler instated of a primitive reference counting method. This is something that Unladen Swallow is doing to improve the performance of python. A more prommising answer is Stackless Python, which uses its own micro-thread implementation instead of relying on the operating system like traditional CPython.