[Twisted-Python] Deadlocks when launching processes - how to investigate?
Glyph Lefkowitz
glyph at twistedmatrix.com
Tue Feb 18 19:50:49 MST 2014
On Feb 18, 2014, at 6:07 PM, exarkun at twistedmatrix.com wrote:
> On 18 Feb, 07:29 pm, glyph at twistedmatrix.com wrote:
>>
>> On Feb 15, 2014, at 5:32 PM, exarkun at twistedmatrix.com wrote:
>>> On 15 Feb, 07:58 pm, glyph at twistedmatrix.com wrote:
>>>>
>>>> The one thing that confused me was that the sample program appeared to be running the program only once a second, and waiting for it to complete before running it again.
>>>
>>> I think it's more like 81 processes once a second and *not* waiting for them to complete before starting over. Notice the lack of yields in key places. I suspect inlineCallbacks has gradually eaten out the part of your brain that recognizes that keyword. ;)
>>
>> I sort of noted this on the ticket, but I think the idea of using KQueue to address this would be great. Is there a similar thing we might be able to do on Linux to get rid of the dependence on a SIGCHLD handler?
>
> Not that I know of. As far as I know Linux is missing good child process event notification support.
Wait... what about... signalfd?!
Lots of mentions of SIGCHLD here:
<http://linux.die.net/man/2/signalfd>
-g
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