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Subject: Re: [OMPI devel] ORTE process name and nodeid
From: Richard Graham (rlgraham_at_[hidden])
Date: 2007-11-18 23:12:54


What is the exact purpose of the process name ?

Rich

On 11/17/07 5:27 PM, "Shipman, Galen M." <gshipman_at_[hidden]> wrote:

>
>
> I am doing some work on Cray's CNL to support shared memory. To support
> shared memory I need to know if processes are local or remote. For other
> systems we simply use the modex in ompi_proc_get_info to get the proc's
> nodeid. When using CNOS I don't need the modex to get a remote processes
> nodeid. In fact, I can obtain every processes pid and nodeid (nid/pid) via a
> single CNOS call.
>
> I have explored a couple of ways to populate the proc structures on the
> CRAY. One involves using #if's to do special things in ompi_proc_get_info. I
> don't like this. The second method involves adding a CNOS nameserver and
> modifying the orte_process_name_t to include the orte_nodeid_t so that the
> nameserver can populate all the info if it can. Prior to this change, the
> orte_nodeid_t was in ompi_proc_t, which doesn't make any sense to me, it is
> an orte level concept and it is only accessible in the ompi side. I also
> don't like adding orte_nodeid_t to orte_process_name_t as it really doesn't
> have anything to do with the a name.. I think it makes more sense to have an
> orte_proc_t.. Something like the following structure:
>
>
>
> struct orte_process_name_t {
> orte_jobid_t jobid; /**< Job number */
> orte_vpid_t vpid; /**< Process number */
> /** "nodeid" on which the proc resides */
> };
>
> Struct orte_proc_t {
> opal_list_item_t super;
> orte_process_name_t proc_name;
> orte_nodeid_t nid;
> };
>
> struct ompi_proc_t {
> orte_proc_t base;
> ..... Etc .....
>
> };
>
>
> I know there is some talk about removing the process names,,, not sure how
> that fits in here but this is what makes sense to me given the current
> architecture. Any thoughts here?
>
>
> - Galen
>
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