Re: [sage-devel] Re: Jupyter notebook by default?

(cross-posting to ipython-dev)

Jon,

At the recent San Francisco meetings, we talked about this.  What do you
think about:

1. keeping track of the size of the io messages sent from any specific
kernel execution
2. When the total size of io reaches some specific size
(user-configurable), transmitting a special "throwing away output, but
here's how to save the output to a file if you want in the future, or how
to increase the limit" message
3. keep a running buffer of the last bit of output attempted to be sent,
and send it when the execution finishes (so basically a ring buffer that
overwrites the oldest message)

This:

* allows small output through
* provides an explanatory message
* provides the last bit of output as well

One thing to figure out: a limit on size of output that is text may not be
appropriate for output that is images, etc.

Thanks,

Jason


On Tue, Jan 5, 2016 at 12:11 PM, Jason Grout <[email protected]> wrote:

>
> ---------- Forwarded message ----------
> From: Jonathan Frederic <[email protected]>
> Date: Tue, Jan 5, 2016 at 11:42 AM
> Subject: Re: [sage-devel] Re: Jupyter notebook by default?
> To: Jason Grout <[email protected]>
> Cc: sage-devel <[email protected]>
>
>
> Jason,
>
> Thanks for pulling me in on this.
>
> William,
>
> I agree, getting a bunch of people to agree on stuff can seem impossible.
> However, you mention Sage offers a couple options to mitigate output
> overflows, can you point me to those options?  The Jupyter Notebook should
> provide multiple options too - this will also make it easier for everyone
> to agree.
>
> Also, in you experience, which of these options work the best?
>
> I was thinking initially of doing something simple, like hard limiting
> data/time, then printing an error if that's exceeded.  In the Jupyter
> Notebook, we have to worry about
> - Too many messages sent on the websocket
> - The notebook json file growing too large and consequently becoming
> unopenable
> - Too much data being appended to the DOM, crashing the browser
>
>
> Thanks!
> -Jon
>
> On Tue, Jan 5, 2016 at 10:19 AM, Jason Grout <[email protected]>
> wrote:
>
>>
>>
>> On Tuesday, January 5, 2016 at 8:17:45 AM UTC-7, William wrote:
>>>
>>>
>>> One example of a subtle feature in Sage (notebook and worksheets) not
>>> in Jupyter, which I was just reminded of, is output limiting.  In Sage
>>> there are numerous rules/options to deal with people doing stuff like:
>>>
>>> while True:
>>>    print "hi!"
>>>
>>> ... which is exactly what students will tend to do by accident...
>>> Jupyter doesn't deal with this, but it might not be too hard to
>>> implement in theory.  One of the main problems is figuring out what
>>> the arbitrary rate limiting defaults "should" be; it's arbitrary, and
>>> depends a lot on whether everything is local, over the web, etc. so
>>> getting a bunch of people to agree is hard, which might mean they will
>>> never implement anything.
>>>
>>
>>
>> William,
>>
>> Jon Frederic in the Jupyter dev meeting happening right now said that he
>> will be working on output limiting as one of his next things.
>>
>> Jason
>>
>
>
>

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