I wrote a scientific simulation environment using python 2.7.
I start several instances of my simulation at the same time by directly using the Process interface:
for i in range(nr_cores):
p = Process(target=worker, args=(i, nr_cores, scheduler, job, nr_iter, return_values, extremes, parameters,))
processes.append(p)
p.start()
for process in processes:
process.join()
This works flawlessly on
- my fedora 21 machine running python 2.7.8 (kernel 3.19.3)
- my OSX machine running python 2.7.6
Now I tried to install it on a debian 7.8 (kernel 3.2.63) machine with python 2.7.3 and odd things started to happen:
- The number of processes listed in top is greater than what I actually spawn (14 instead of 2)
- Of these fourteen only two are running, the rest is sleeping
- The two running processes share one core. The other cores are idle
I downloaded and compiled python 2.7.9 but the behavior is exactly the same.
I remember seeing a similar issue on another debian machine, but unfortunately I can't remember what version it was.
Has anyone encountered something like this before?
Thanks
