[BangPypers] Help needed on reviewing my presentation for pycon.

[Senthil Kumaran]

On Mon, Jun 28, 2010 at 10:25:57AM +0530, Shiv Shankar wrote:
> Please read my presentation notes, I am not talking about Twisted, I am
> talking more about the 2 approaches, the second approach being used in
> designing twisted giving you a clear reason to use twisted.

Okay, I read it again to get a better context of your presentation.
My understanding is, you are building up the requirements for a need
for asynchronous IO and then landing up with Twisted based approach.
BIND like software could be one example which could be chosen as
example out of any generic Server.

> And,
> 0. If you just want to do Networking Software, asyncore is availiable in
> native python, why use twisted ? Where does IO comes in most networking
> software ?

I did not properly get this question. In my understanding, you can use
asycore pretty most of the places where you can use twisted. Except
that you will have to do more. Write more code. Asyncore is different
from threading concepts for sure. But it is event driven.  Twisted
gives you a framework with easy implementation of reactor pattern and
then gives you an ability to create differeds for handling blocking
requests in a non-blocking way. You could do the same using asyncore
with more work.

> 1. Threads in any programing language is problematic, unless until used
> right.* Python is different, due to its abstractions.*

- It's a pretty generic point. I am trying to understand what it is.

> 2. For developing a concurrent system the most crucial thing is
> write to read ratio, Twisted is used for network programing because
> the ratio is low in most cases, and due to the async bindings for
> read/write it aids to concurrency.

I got confused here too. Perhaps I am seeing it from a different angle
or I have not read the same literature that you have read. Are you
referring to IO operation by saying read/write. And also if you point
me to any literature on ratio of write to read (O to I? ) on
concurrency that would be helpful.

> Read about SEDA, I don't know if you have experience developing multi

I am hearing about SEDA for the first time and it says it is a 'Staged
Event Driven Approach' and gives the details of how staging can help
in the Event Driven Approach. Now, we have quickly moved to a 'staged'
event driven from event driven. Pretty new concept, at least in the
Python world.  How is twisted coming into picture here? 

But yeah, this discussion is pointing out that that a single focussed
topic, say if you take twisted and designing a server using it might
be helpful.

If focussing on Benchmarks, then it might be a topic in itself.


-- 
Senthil

BOFH excuse #402:

Secretary sent chain letter to all 5000 employees.