Re: [BProc] API changes from cm3 to cm4

[Greg W. <gw...@la...>]

On 20/04/2004, at 6:37 PM, Brian W. Barrett wrote:

> On Apr 20, 2004, at 3:06 PM, Greg Watson wrote:
>
>> None that I know of. The file clients/sys/bproc.h documents all the 
>> interfaces that are available.
>>
>> In order to get the node number from the IP address, you now use:
>
> <snip>
>
>> In order to look up a node by it's name, you first convert the name 
>> to an IP address, then use the above. If you're running the latest 
>> beonss then you can look up nodes using the names "master", "self", 
>> "n0", "n1", etc. using the standard gethostbyname() routines.
>
> Ok, that makes sense and I think I could fix up the bproc support in 
> LAM to deal with these changes no problem.  Can I assume that anyone 
> running bproc 4.0 is using the beonss package?  If not, is there any 
> way to convert from name to IP address other than the functions that 
> disappeared for bproc 4.0?  I guess what I'm asking is if it is safe 
> to look for bproc_getnodebyname() and if I don't find that, assume I 
> can call gethostbyname("n0") and get a reasonable result?

I think it's a reasonable assumption. If they're not using beonss, then 
providing the mapping in /etc/hosts will be equally effective. BTW, 
does LAM need to do the lookup on the nodes or on the frontend? 
Currently, beonss only allows a node to look up it's own name or the 
name of the frontend, but not the names of other nodes.

>
> Daniel, We (the LAM team) don't have any access to BProc 4.0 clusters. 
>  Given that this looks fairly simple to hack up, I can probably fix 
> something up for LAM 7.1, but would need a volunteer to do some 
> testing (hint, hint).
>

I'm going to need LAM on a bproc cluster in the next month or so. I'll 
be able to help out if this timeframe works for you.

Regards,

Greg