Re: alpha version of user area tools for 2.6

On Tue, Apr 18, 2006 at 10:15:30AM +0200, David Santo Orcero wrote:
>  The most of the documentation, the scripts and the know-how will stay 
> similar.

everything is *DIFFERENT*. So I don't understand why you want to do
this.

>  I do know that 2.4 clusters will stay a long time; that is why I think 
> that compatibility is important. This will allow developers, system 
> administrators and documentators not to maintain two differents code 
> lines.

That's useless to keep compatibility, for 2 different codebase that are going to
drift away. You'll end up spending time where that's not necessary.
Plus that give a great opportunity to actually break the link with mosix.

If that's really necessary afterward (once everything else is working),
if people want to spend time doing that, fine by me.
But that's actually just will be something like:

mosctl -> execve("omctl")

>  The development will continue slow (I am making this on my little free 
> time); but at a constant rithm. It is expected to have all working (with 
> node registering, cluster management and migration) for summer.

loadbalancing and node registration are the only useful bit so far.

node registration is actually pretty straightforward, receiving a
message on the socket from X, you just add it to some list of node to
monitor. 

load balancing is a bit more work, that can be split in 2:
* reading local processes information, to choose process that can be
  migrated and that have good reason to be.
* exchanging information (cpu, memory, processes) with other node
  to be able to send some process to the correct place.

The link between the two is "just" a function that look like (OCaml notation):
local_info -> remote_info -> (pid, where_to)

This doesn't have to be smart at initial implementation anyway.

As well I suggest writing the load balancer in a high level language.
that's 1 week work using something like OCaml.

-- 
Vincent Hanquez


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