hyperthreading fix try #2
Mon Feb 14 10:16:00 GMT 2005
On Mon, Feb 14, 2005 at 01:17:03AM +1000, Nick Coghlan wrote:
>Nick Coghlan wrote:
>>Christopher Faylor wrote:
>>Of course, I don't actually know if this is a related problem or not.
>>I'm hoping Chris can check it easily, since it happens with the standard
>>Cygwin Python, not just with the version I built from Python's current CVS.
>I took the obvious step of running that test script directly, playing with
>the number of threads spawned, and the number of files created by each
>thread, as well as adding some more print statements to the script to see
>where it was hanging.
>Command lines looked like (with thread and file counts filled in):
>$ python /lib/python2.4/test/test_threadedtempfile.py -t <threads> -f
>The results weren't particularly deterministic, beyond a general 'more
>threads, more files' -> 'more likely to hang'. 10 & 10 seemed to do it
>fairly effectively although even that would occasionally succeed (the
>default is 20 & 20).
>When it *did* hang, it was with a number of threads successfully opening
>their files on an iteration, with the remainder of the threads locking up
>attempting to open a new temporary file. The next time around, the
>remaining threads would hang while attempting to open the temporary file.
>The main script hangs because it is waiting for the threads to terminate.
Is this a regression? Was this also problem with 1.5.12?
Unless there are pipes involved in this test, I don't see how it could be
related to the problem.
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