If I start more than 1020 threads simultaneously, using
the threading module, Python 2.1 causes segmentation
faults, or will not exit, under Linux. I have not
tested this on Windows.

I don't know whether the problems are caused by the
threads themselves, or the threading.Event for which
they are waiting.

I have attached a program threadKill3.py which
demonstrates this (including sample runs and output).

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We need two things in order to offer any useful help:
1. A stack trace from the core file.
2. Evidence that a C program that starts 1024 threads
   won't do the same thing.

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Python Support/Developers,

I believe the fault is in Pthreads and not in the python 
interpreter. Pthreads under Linux has a few issues. Running 
this python test under Windows should not have this problem.

I have run similar tests in python with txObject ATK's 
abstraction layer to native(pthreads/Windows) threads. I 
have run these python tests on Linux, Windows and Solaris. 
Only Linux has this problem.

If folks are interested, the project txObject ATK 
(txobject.sourceforge.net) has home grown threads that can 
scale to many thousand of threads (or as much memory as you 
have). txObject ATK also provides python wrappers to these 
features. However these threads are non-preemptive.

Hope this helps

Tom

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Unlikely that this is Python's fault.