Maximum number of threads
zanesdad at bellsouth.net
Wed Sep 29 17:47:31 CEST 2004
Kirby Angell wrote:
> Michael Fuhr wrote:
>> What happens when you hit this "hard limit"? If there's an error
>> message then it might hint at the problem.
> If I run this program:
>> I'm not current on Linux threading models -- do these versions of
>> Linux create a new process for each thread? If so, could resource
>> limits be preventing you from creating more threads?
> I don't think Linux creates a new process for each thread. Sure seems
> like this would have to be something related to python since 2.2 could
> create a thousand or more threads. Although I have to admit that it
> is odd that the maximum number of threads I can create on RH9 is
> different than on FC2.
Versions of RedHat prior to 9 did something that made it appear that
each thread was a process. I don't know all the ins and outs (I think
it had something to do with user-space vs. kernel-space), but when the
Native Posix Thread Library (NPTL) appeard in RH9, each thread did not
show up as its own process (say, in top). I think it's probably an OS
limitation. I kicked off the same script on Windows XP that I kicked
off on FC2 and XP was able to generate over 2000 threads as opposed to
around 400 for FC2. I may be wrong, but I think Python relies on the
underlying OS threading libraries for everything threading related.
Which is probably why the recent change in either 2.2 or 2.3 for a dummy
threading module that simulates threading on systems that do not support
threading. I know my babbling isn't getting you any closer to a
More information about the Python-list