[IPython-dev] Coordinating the XREQ and SUB channels

Brian Granger ellisonbg at gmail.com
Fri Jul 16 01:25:14 EDT 2010

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.


> Cheers,
> f

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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