[Twisted-Python] Twisted TCP Window Full due to time-consuming fuction

Phil Mayers p.mayers at imperial.ac.uk
Wed Mar 7 04:46:54 EST 2012

On 03/07/2012 08:37 AM, Peng Xiao -X (penxiao - Digital China at Cisco) 

> Because the function of parseBuffer is a litter time consuming, so the
> receive buffer is full sometimes.

The answer is: don't do that.

If parseBuffer is expensive, you will block the reactor, which you must 
not do.

You have two options:

  1. Run the work in a thread with "deferToThread". Note: you MUST NOT 
call any reactor APIs from the thread, except reactor.callFromThread

  2. Break the work up into small pieces, and run it incrementally. See 
twisted.internet.task.coiterate for example; this allows you to run any 
iterator, such as a generator, and get the result as a deferred.

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