On 20Dec2009 17:36, Andreas R�sdal <andre...@pvv.ntnu.no> wrote: | I have some problems with a http proxy which is implemented | in Python 2.6. A few times a day, the proxy begins using 100% CPU | and doesn't work any more. | | I have created a thread dump when the problem occurs here: | http://www.pvv.ntnu.no/~andrearo/thread-dump.html | | This is a thread dump during normal operation: | http://www.pvv.ntnu.no/~andrearo/thread-dump-normal.html
These two URLs don't work for me. [...] | Any advice on why this Python program appears to freeze? Is there anything | more I can do to find out why this problem occurs? Sounds like a livelock: http://en.wikipedia.org/wiki/Deadlock#Livelock or busy lock. Can you find out which bits of your program are busy? Are there places in your code that loop, polling for data, instead of using blocking I/O. With a network proxy, a typical place that might happen is a loop testing select() (or its poll-like friends) with a short or zero timeout on inactive file handles. Cheers, -- Cameron Simpson <c...@zip.com.au> DoD#743 http://www.cskk.ezoshosting.com/cs/ No electrons were harmed in the production of this message. - Dr. P. Gensheimer <pa...@fs1.mpifr-bonn.mpg.de> -- http://mail.python.org/mailman/listinfo/python-list
