[IPython-dev] Coordinating the XREQ and SUB channels

Brian Granger ellisonbg at gmail.com
Fri Jul 16 12:00:25 EDT 2010

Here is the commit:


You will need to recompile pyzmq for this to go into affect.  Let me
know if this doesn't fix the problem.



On Fri, Jul 16, 2010 at 7:40 AM, Evan Patterson <epatters at enthought.com> wrote:
> On Fri, Jul 16, 2010 at 12:25 AM, Brian Granger <ellisonbg at gmail.com> wrote:
>> On Thu, Jul 15, 2010 at 1:22 PM, Fernando Perez <fperez.net at gmail.com>
>> wrote:
>> > On Thu, Jul 15, 2010 at 11:07 AM, Brian Granger <ellisonbg at gmail.com>
>> > wrote:
>> >>
>> >> Definitely hard to get right and terminal based frontends will
>> >> definitely need something like flush.  Let's see how it goes with this
>> >> approach.
>> >
>> > Though absent a real event loop with a callback model, there it will
>> > need to be implemented with a real sleep(epsilon) and a total timeout.
>> >  Terminal frontends will always simply be bound to flushing what they
>> > can and then moving on if nothing has come in a given window they wait
>> > for.  Such is life when your 'event loop' is the human hitting the
>> > RETURN key...
>> >
>> > Evan, quick question: when I open your frontend_widget, I see 100% cpu
>> > utilization all the time.  Do you see this on your end?
>> We should make sure we understand this. Min and I found that our new
>> Tornado event loop in pyzmq was using 100% CPU because of a bug in the
>>  poll timeout (units problems).  We have fixed this (so we think!), so
>> I am hopeful the current issue is coming from the flush logic.
> Unfortunately, this does not seem to be the case. I have confirmed that the
> problem is indeed with the IOLoops. They have the the CPU pegged at 100%
> even when the console is idle, i.e. when no flushing or communication of any
> sort occurring.
> Did you commit your fix to the main branch of PyZMQ? Maybe I am not using
> the right stuff.
> Evan

Brian E. Granger, Ph.D.
Assistant Professor of Physics
Cal Poly State University, San Luis Obispo
bgranger at calpoly.edu
ellisonbg at gmail.com

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