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Showing content from http://mail.python.org/pipermail/python-dev/2003-February/033724.html below:

[Python-Dev] Bytecode idea

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 Jeremy Hylton wrote:
>
> If you are benchmarking various opcode effects, I'd recommend trying to
> revive the simple cycle counter instrumentation I did for Python 2.2.  The
> idea is to use the Pentium cycle counter to measure the number of cycles
> spent on each trip through the mainloop.

For Linux >= 2.4 and an x86 CPU, oprofile will tell you (stochastically) how 
many CPU cycles are spent on each x86 instruction.

http://oprofile.sourceforge.net/

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