Why does my Python program average only 33% CPU per process? How can I make Python use all available CPU?

Question

I use Python 2.5.4. My computer: CPU AMD Phenom X3 720BE, Mainboard 780G, 4GB RAM, Windows 7 32 bit.

I use Python threading but can not make every python.exe process co

Answer 1

Global Interpreter Lock

The reasons of employing such a lock include:

* increased speed of single-threaded programs (no necessity to acquire or release locks
  on all data structures separately)
* easy integration of C libraries that usually are not thread-safe.

Applications written in languages with a GIL have to use separate processes (i.e. interpreters) to achieve full concurrency, as each interpreter has its own GIL.