Re: om2.6 What's currently showable ?

Evan Hisey wrote:
> Florain-
> Shared libs. should be fine, shared memory is a problem. There was a
> second patch built to help resolve this issue in the 2.4 series. I
> think  the plan is that after om gets working on 2.6. to make shared
> memory support part of the standard patch.

OK, I add to the todolist to get the shared memory patch from the 2.4 
work on the 2.6, as well as checking the preempt safety, I also added 
thhe fact that simple processes migration work, including processes 
using shared libraries.

http://openmosix.snarc.org/wakka.php?wiki=ToDo

Still, I have a question, let's take an example, A and B are to 
processes using the shared library L, L has a global variable (say foo), 
and both A and B call a function that increase this foo variable by one. 
Normally, when A calls this function, foo go to 1 (from 0), then B call 
this function, and foo go to 2 (from 1). Now, what if A runs on a node, 
and B on another one, but both are initiated from a unique master node. 
The same behaviour should happen, isn''t it ?

If this scenario is exact, does it work with openMosix 2.6 ?

>
> Evan H.
>
> On 7/24/06, Florian Delizy <[email protected]> wrote:
>> Mike Wharton wrote:
>> > Install 2.4.26 and show your boss that. It works brilliantly, 
>> unless there
>> > is a dire need for your demo cluster to be running a 2.6 kernel.
>> Well actually, that's the case ... If I choose to use the 2.6 kernel,
>> (which I did), we have to have something *working* in a production
>> environement, and I have to demonstrate it ... on a 2.6. As I had been
>> told already, it seems that oM2.6 is able to migrate processes, unless
>> some bad syscalls happens ... Which bad syscalls ? For instance, a
>> program using a shared library would have a mmap on it, would that fail
>> on oM2.6 ?
>>
>> This choice is quite important to me, and moreover, I can only help
>> continuing to develop oM if I can proove the feasability with oM2.6
>> >  In which
>> > case just write a dumb test program and migrate that on 2.6. I 
>> believe you
>> > can demo 2.6 but processes have to be manually migrated.
>> I am not sure that would be enough ... though ... I guess that programs
>> that we have to migrate are something like, using a shared lib, now the
>> question is how would taht be done ... (I don't know yet). A simple
>> scenario, if several programs are using a single shared lib, and all
>> programs are spread over different cluster nodes, would that work ?
>> > I believe the
>> > plan is to use a user level daemon to handle process migration in 
>> 2.6 ( a
>> > FAR better idea imho).
>> >
>> >
>> >
>> At least that was my idea too
>>
>> > Mike
>> >
>> >
>> >> quoting Vincent Hanquez :
>> >>
>> >>> we miss, a working OpenMosix  :)
>> >>>
>> >> Well, that's kind of frightening ;) I need to make a demo to my 
>> boss in
>> >> a few time, showing that openMosix can migrate processes to a 
>> node, and
>> >> execute those tasks there, is this even working ? (I hope yes).
>> >>
>> >> In the same idea than the Todo list in the wiki, can we add a feature
>> >> list, which explicitely state what's working, and what's not ?? (that
>> >> would help me for instance to show the viability of openMosix to non
>> >> developer people) ...
>> >>
>> >>
>> >> Florian Delizy
>> >>
>> >> 
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