ocaml-duppy: an advanced scheduler for ocaml.

ocaml-duppy: an advanced scheduler for ocaml.

[Romain Beauxis]

	Hi all !

Along with our project (liquidsoap), we (the savonet team) have developped an 
advanced scheduler that we needed for our software. It is now available as a 
seperate module, and we hope it could be usefull for some of you.

The basics of this scheduler is to implement a wrapper around Unix.select in 
order to be able to wait for events on a socket and/or a given delay and 
execute a task when one of the waited events occured.

We also wrote an asynchronous interface as well as a simple I/O interface, in 
order to read and write to sockets, or submit an asychronous task to a 
scheduler.

Several queues can be run against the same scheduler, each one living in a 
different thread. Also, each task has a priority, which can of your favorite 
type, and each queue decides if it wants to process a task according to a 
predicate passed at its initialisation.

This scheduler can be very usefull to write simple servers, as well as to 
develop a multi-thread task processing system. Two simple telnet and http 
examples are provided in the source.

You can find more informations on the module there:
  http://www.rastageeks.org/duppy.html
In particular, the documentation is available there:
  http://www.rastageeks.org/ocaml-duppy/Duppy.html
You can also download the module there:
https://sourceforge.net/project/showfiles.php?group_id=89802&package_id=266393


Romain
-- 
The bars could not hold me;
Force could not control me now.
They try to keep me down, yeah!
But Jah put I around.
(...)
Let me tell you this -
I'm a duppy conqueror !

Re: [Caml-list] ocaml-duppy: an advanced scheduler for ocaml.

[Gerd Stolpmann]

How is that different from my equeue approach?

Gerd

Am Freitag, den 07.03.2008, 21:29 +0100 schrieb Romain Beauxis:
> 	Hi all !
> 
> Along with our project (liquidsoap), we (the savonet team) have developped an 
> advanced scheduler that we needed for our software. It is now available as a 
> seperate module, and we hope it could be usefull for some of you.
> 
> The basics of this scheduler is to implement a wrapper around Unix.select in 
> order to be able to wait for events on a socket and/or a given delay and 
> execute a task when one of the waited events occured.
> 
> We also wrote an asynchronous interface as well as a simple I/O interface, in 
> order to read and write to sockets, or submit an asychronous task to a 
> scheduler.
> 
> Several queues can be run against the same scheduler, each one living in a 
> different thread. Also, each task has a priority, which can of your favorite 
> type, and each queue decides if it wants to process a task according to a 
> predicate passed at its initialisation.
> 
> This scheduler can be very usefull to write simple servers, as well as to 
> develop a multi-thread task processing system. Two simple telnet and http 
> examples are provided in the source.
> 
> You can find more informations on the module there:
>   http://www.rastageeks.org/duppy.html
> In particular, the documentation is available there:
>   http://www.rastageeks.org/ocaml-duppy/Duppy.html
> You can also download the module there:
> https://sourceforge.net/project/showfiles.php?group_id=89802&package_id=266393
> 
> 
> Romain
-- 
------------------------------------------------------------
Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany 
gerd@gerd-stolpmann.de          http://www.gerd-stolpmann.de
Phone: +49-6151-153855                  Fax: +49-6151-997714
------------------------------------------------------------

Re: [Caml-list] ocaml-duppy: an advanced scheduler for ocaml.

[Romain Beauxis]

Le Friday 07 March 2008 21:58:26 Gerd Stolpmann, vous avez écrit :
> How is that different from my equeue approach?

Well, it is very similar, clearly. 
The difference I can see for now, is that Duppy is more simple and oriented 
toward socket events and delays. In particular, it is not clear to me wether 
equeue can accept delayed tasks.

Of course, we didn't meant to deprecate your work, but perhaps it can be 
usefull for different taks..


Romain
-- 
Seven miles of Black Star Liners coming in the harbour.
Yeah, seven miles of Black Star Liners coming in the harbour.
I can see them coming.
I can see I dreams running.
I can hear the Elders saying,
These are the days for which we've been praying.

Re: [Caml-list] ocaml-duppy: an advanced scheduler for ocaml.

[Gerd Stolpmann]

Am Freitag, den 07.03.2008, 22:08 +0100 schrieb Romain Beauxis:
> Le Friday 07 March 2008 21:58:26 Gerd Stolpmann, vous avez écrit :
> > How is that different from my equeue approach?
> 
> Well, it is very similar, clearly. 
> The difference I can see for now, is that Duppy is more simple and oriented 
> toward socket events and delays. In particular, it is not clear to me wether 
> equeue can accept delayed tasks.
> 
> Of course, we didn't meant to deprecate your work, but perhaps it can be 
> usefull for different taks..

My question was only out of curiosity. I am sometimes interested why
people reinvent wheels - and if it is only for a different color.

Equeue supports delays. It doesn't support priorities, however. Also,
multi-threading integration seems to be different.

Gerd
-- 
------------------------------------------------------------
Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany 
gerd@gerd-stolpmann.de          http://www.gerd-stolpmann.de
Phone: +49-6151-153855                  Fax: +49-6151-997714
------------------------------------------------------------