[Python-Dev] Python parallel benchmark (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Fri May 16 04:55:03 CEST 2008

Tom Pinckney wrote:

If I look at top while running 2 or more threads, both cores are being used 100% and there is no idle time on the system.

If you run it with just one thread, does it use up only one core's worth of CPU?

If so, this suggests that the GIL is being released. If it wasn't, two threads would still only use one core's worth.

Also, if you have only two cores, using more than two threads isn't going to gain you anything whatever happens.

-- Greg