On Tue, 9 Dec 2008 15:43:00 -0500, Phil Christensen <[EMAIL PROTECTED]> wrote:
Hello All-
I'm running into an issue with a project I'm working on that involves
coordinating a large number of external processes to encode audio into
different formats, and do other bookkeeping.
I seem to be having a problem when I use spawnProcess to call the md5sum
binary. The processes spawned seem to stick around forever, until I kill
the server. This doesn't appear to happen with any other binary.
I start with the following abstract class:
[snip MD5Checksum ProcessProtocol]
With the plan of executing it inside an inlineCallbacks-decorated function,
like this:
proto = yield process.MD5Checksum.run(filename)
checksum = proto.get_checksum()
Everything is basically working, except for the fact that the md5sum
processes never go away. It does seem that processEnded is being called,
since that's what issues the callback on the deferred returned by run(),
but the process sticks around, as a non-zombie, non-defunct process that
still appears to be using small amounts of CPU time.
processEnded shouldn't be called until the child has exited and been
reaped. This means that the md5sum process should not still exist in
any form if processEnded is being called. So either the processes you're
seeing aren't associated with the ProcessProtocol instances you think, or
there's a pretty serious bug in Twisted. :)
A self-contained example of this behavior would be pretty handy. You should
probably start by making sure processEnded is really being called for the
ProcessProtocol instances associated with the processes which aren't actually
exiting.
Also, once the checksum has been retrieved, killing the server doesn't
cause any errors, unlike when a process is legitimately terminated by
killing the server, which displays an error (since right now i'm not
actually catching ProcessTerminated scenarios):
2008-12-09 15:17:48-0500 [-] Unhandled error in Deferred:
2008-12-09 15:17:48-0500 [-] Unhandled Error
Traceback (most recent call last):
Failure: twisted.internet.error.ProcessTerminated: A process has
ended with a probable
error condition: process ended by signal 2.
Any help in this matter would be appreciated...
Jean-Paul
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