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From: Nathan DeBardeleben (ndebard_at_[hidden])
Date: 2006-07-05 16:40:40


> Open MPI: 1.0.2
> Open MPI SVN revision: r9571
The rc value returned by the 'get' call is '0'.
All I'm doing is calling init with my own daemon name, it's coming up
fine, then I immediately call this to figure out how many nodes are
associated with this machine.

-- Nathan
Correspondence
---------------------------------------------------------------------
Nathan DeBardeleben, Ph.D.
Los Alamos National Laboratory
Parallel Tools Team
High Performance Computing Environments
phone: 505-667-3428
email: ndebard_at_[hidden]
---------------------------------------------------------------------

Ralph H Castain wrote:
> Hi Nathan
>
> Could you tell us which version of the code you are using, and print out the
> rc value that was returned by the "get" call? I see nothing obviously wrong
> with the code, but much depends on what happened prior to this call too.
>
> BTW: you might want to release the memory stored in the returned values - it
> could represent a substantial memory leak.
>
> Ralph
>
>
>
> On 7/5/06 9:28 AM, "Nathan DeBardeleben" <ndebard_at_[hidden]> wrote:
>
>
>> I used to use this code to get the number of nodes in a cluster /
>> machine / whatever:
>>
>>> int
>>> get_num_nodes(void)
>>> {
>>> int rc;
>>> size_t cnt;
>>> orte_gpr_value_t **values;
>>>
>>> rc = orte_gpr.get(ORTE_GPR_KEYS_OR|ORTE_GPR_TOKENS_OR,
>>> ORTE_NODE_SEGMENT, NULL, NULL, &cnt, &values);
>>>
>>> if(rc != ORTE_SUCCESS) {
>>> return 0;
>>> }
>>>
>>> return cnt;
>>> }
>>>
>> This now returns '0' on my MAC when it used to return 1. Is this not an
>> acceptable way of doing this? Is there a cleaner / better way these days?
>>
>
>
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