Running Python on a MOSIX cluster

[Guido Stepken]

Mikko Huhtala wrote:

> I am trying to run Python programs on a MOSIX cluster (Linux kernel
> 2.4.8 + MOSIX 1.2.2). A single Python process runs nicely and finishes
> cleanly but if there are more than one Python process launched from
> the same shell or from a Python program, all but the one (not
> necessarily the one that started first) terminate with a segfault and
> core dump. The output from the segfaulted processes is not complete.
> 
> I tried RPM packaged Pythons 1.5.2 and 2.1.1 as well as 2.1.1 compiled
> from source on the MOSIX cluster. The result was the same with all of
> them.
> 
> I am not very familiar with the inner workings of either Python or
> MOSIX. Does the Python interpreter make a full copy of itself for each
> Python process? For some reason concurrent Python processes do not
> like each other on a MOSIX kernel.
> 
> 
> Mikko Huhtala
> 

Python 2.1.1 IMHO is stackless python ....green threads means, that python 
interpreter itself is doing multitasking. Older versions 1.5, 1.6 ... need 
kernel-threads - so older versions may spread over the mosix cluster.

regards, Guido Stepken