Re: Shared Memory, semaphores and a new "box"

On 04.03.2008, at 12:24, Alejandro Guerrieri wrote:

> Ok, "contribute it GPL'ed to the project", I was meant to make it  
> available to the project, I don't want to get into a licensing  
> nightmare, just wanted to give it back to you guys! :)
>
> The purpose of this box is to overcome latency problems that arise  
> when trying to enqueue thousands of messages, for example from PHP.

I think the problem is not Kannel or HTTP, the problem is your way of  
using it in PHP.

If you for example use something like file("http://localhost/ 
sendsms=...") in php to send an SMS, PHP will stop and wait until  
Kannel has respondet to it. After that you can continue. This wont get  
you over something like 10 sms/sec. However if you run 10 such PHP  
scripts in parallel, you will get 100 sms/sec without any problems. So  
the latency is caused by PHP waiting for the reply instead of  
continuing and preparing to requeue the next message. Parallelizing is  
the margic word here.

So instead of full throttle, you will get stop & go.

> My goal is to implement a generic interface able of abstract the  
> kannel functionality into some languages librarys. In doing it, I  
> can aim to implement generic (PHP, Perl, Python, etc.) interfaces  
> for sending messages.

If you are really concerned about performance, you would use a non  
interpreted language to send SMS. And if you are even more concerned  
about a specific delivery, you would implement SMPP right away in your  
code. This eliminiates the abstraction layer of Kannel (while tying  
you to SMPP only of course). But if thats stopping you to get to the  
performance you need (like > 10'000 sms/sec) then you should do that.  
However, up to 1'000 sms/sec, you will have absolutely no problem in  
Kannel.

So again. What speeds do you see and what speeds would you need really?






Andreas Fink

Fink Consulting GmbH
Global Networks Schweiz AG
BebbiCell AG

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