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Subject: Re: [OMPI users] new map-by-obj has a problem
From: tmishima_at_[hidden]
Date: 2014-02-27 23:13:23


Hi Ralph, I can't operate our cluster for a few days, sorry.

But now, I'm narrowing down the cause by browsing the source code.

My best guess is the line 529. The opal_hwloc_base_get_obj_by_type will
reset the object pointer to the first one when you move on to the next
node.

529 if (NULL == (obj = opal_hwloc_base_get_obj_by_type
(node->topology, target, cache_level, i, OPAL_HWLOC_AVAILABLE))) {
530 ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
531 return ORTE_ERR_NOT_FOUND;
532 }

if node->slots=1, then nprocs is set as nprocs=1 in the second pass:

495 nprocs = (node->slots - node->slots_inuse) /
orte_rmaps_base.cpus_per_rank;
496 if (nprocs < 1) {
497 if (second_pass) {
498 /* already checked for oversubscription permission,
so at least put
499 * one proc on it
500 */
501 nprocs = 1;

Therefore, opal_hwloc_base_get_obj_by_type is called one by one at each
node, which means
the object we get is always first one.

It's not elegant but I guess you need dummy calls of
opal_hwloc_base_get_obj_by_type to
move the object pointer to the right place or modify
opal_hwloc_base_get_obj_by_type itself.

Tetsuya

> I'm having trouble seeing why it is failing, so I added some more debug
output. Could you run the failure case again with -mca rmaps_base_verbose
10?
>
> Thanks
> Ralph
>
> On Feb 27, 2014, at 6:11 PM, tmishima_at_[hidden] wrote:
>
> >
> >
> > Just checking the difference, not so significant meaning...
> >
> > Anyway, I guess it's due to the behavior when slot counts is missing
> > (regarded as slots=1) and it's oversubscribed unintentionally.
> >
> > I'm going out now, so I can't verify it quickly. If I provide the
> > correct slot counts, it wll work, I guess. How do you think?
> >
> > Tetsuya
> >
> >> "restore" in what sense?
> >>
> >> On Feb 27, 2014, at 4:10 PM, tmishima_at_[hidden] wrote:
> >>
> >>>
> >>>
> >>> Hi Ralph, this is just for your information.
> >>>
> >>> I tried to restore previous orte_rmaps_rr_byobj. Then I gets the
result
> >>> below with this command line:
> >>>
> >>> mpirun -np 8 -host node05,node06 -report-bindings -map-by socket:pe=2
> >>> -display-map -bind-to core:overload-allowed
~/mis/openmpi/demos/myprog
> >>> Data for JOB [31184,1] offset 0
> >>>
> >>> ======================== JOB MAP ========================
> >>>
> >>> Data for node: node05 Num slots: 1 Max slots: 0 Num procs: 7
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 0
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 2
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 4
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 6
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 1
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 3
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 5
> >>>
> >>> Data for node: node06 Num slots: 1 Max slots: 0 Num procs: 1
> >>> Process OMPI jobid: [31184,1] App: 0 Process rank: 7
> >>>
> >>> =============================================================
> >>> [node06.cluster:18857] MCW rank 7 bound to socket 0[core 0[hwt 0]],
> > socket
> >>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>> [node05.cluster:21399] MCW rank 3 bound to socket 1[core 6[hwt 0]],
> > socket
> >>> 1[core 7[hwt 0]]: [./././.][././B/B]
> >>> [node05.cluster:21399] MCW rank 4 bound to socket 0[core 0[hwt 0]],
> > socket
> >>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>> [node05.cluster:21399] MCW rank 5 bound to socket 1[core 4[hwt 0]],
> > socket
> >>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>> [node05.cluster:21399] MCW rank 6 bound to socket 0[core 2[hwt 0]],
> > socket
> >>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>> [node05.cluster:21399] MCW rank 0 bound to socket 0[core 0[hwt 0]],
> > socket
> >>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>> [node05.cluster:21399] MCW rank 1 bound to socket 1[core 4[hwt 0]],
> > socket
> >>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>> [node05.cluster:21399] MCW rank 2 bound to socket 0[core 2[hwt 0]],
> > socket
> >>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>> ....
> >>>
> >>>
> >>> Then I add "-hostfile pbs_hosts" and the result is:
> >>>
> >>> [mishima_at_manage work]$cat pbs_hosts
> >>> node05 slots=8
> >>> node06 slots=8
> >>> [mishima_at_manage work]$ mpirun -np 8 -hostfile ~/work/pbs_hosts
> >>> -report-bindings -map-by socket:pe=2 -display-map
> >>> ~/mis/openmpi/demos/myprog
> >>> Data for JOB [30254,1] offset 0
> >>>
> >>> ======================== JOB MAP ========================
> >>>
> >>> Data for node: node05 Num slots: 8 Max slots: 0 Num procs: 4
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 0
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 2
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 1
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 3
> >>>
> >>> Data for node: node06 Num slots: 8 Max slots: 0 Num procs: 4
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 4
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 6
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 5
> >>> Process OMPI jobid: [30254,1] App: 0 Process rank: 7
> >>>
> >>> =============================================================
> >>> [node05.cluster:21501] MCW rank 2 bound to socket 0[core 2[hwt 0]],
> > socket
> >>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>> [node05.cluster:21501] MCW rank 3 bound to socket 1[core 6[hwt 0]],
> > socket
> >>> 1[core 7[hwt 0]]: [./././.][././B/B]
> >>> [node05.cluster:21501] MCW rank 0 bound to socket 0[core 0[hwt 0]],
> > socket
> >>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>> [node05.cluster:21501] MCW rank 1 bound to socket 1[core 4[hwt 0]],
> > socket
> >>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>> [node06.cluster:18935] MCW rank 6 bound to socket 0[core 2[hwt 0]],
> > socket
> >>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>> [node06.cluster:18935] MCW rank 7 bound to socket 1[core 6[hwt 0]],
> > socket
> >>> 1[core 7[hwt 0]]: [./././.][././B/B]
> >>> [node06.cluster:18935] MCW rank 4 bound to socket 0[core 0[hwt 0]],
> > socket
> >>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>> [node06.cluster:18935] MCW rank 5 bound to socket 1[core 4[hwt 0]],
> > socket
> >>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>> ....
> >>>
> >>>
> >>> I think previous version's behavior would be close to what I expect.
> >>>
> >>> Tetusya
> >>>
> >>>> They have 4 cores/socket and 2 sockets, totally 4 X 2 = 8 cores,
each.
> >>>>
> >>>> Here is the output of lstopo.
> >>>>
> >>>> mishima_at_manage round_robin]$ rsh node05
> >>>> Last login: Tue Feb 18 15:10:15 from manage
> >>>> [mishima_at_node05 ~]$ lstopo
> >>>> Machine (32GB)
> >>>> NUMANode L#0 (P#0 16GB) + Socket L#0 + L3 L#0 (6144KB)
> >>>> L2 L#0 (512KB) + L1d L#0 (64KB) + L1i L#0 (64KB) + Core L#0 + PU L#0
> >>>> (P#0)
> >>>> L2 L#1 (512KB) + L1d L#1 (64KB) + L1i L#1 (64KB) + Core L#1 + PU L#1
> >>>> (P#1)
> >>>> L2 L#2 (512KB) + L1d L#2 (64KB) + L1i L#2 (64KB) + Core L#2 + PU L#2
> >>>> (P#2)
> >>>> L2 L#3 (512KB) + L1d L#3 (64KB) + L1i L#3 (64KB) + Core L#3 + PU L#3
> >>>> (P#3)
> >>>> NUMANode L#1 (P#1 16GB) + Socket L#1 + L3 L#1 (6144KB)
> >>>> L2 L#4 (512KB) + L1d L#4 (64KB) + L1i L#4 (64KB) + Core L#4 + PU L#4
> >>>> (P#4)
> >>>> L2 L#5 (512KB) + L1d L#5 (64KB) + L1i L#5 (64KB) + Core L#5 + PU L#5
> >>>> (P#5)
> >>>> L2 L#6 (512KB) + L1d L#6 (64KB) + L1i L#6 (64KB) + Core L#6 + PU L#6
> >>>> (P#6)
> >>>> L2 L#7 (512KB) + L1d L#7 (64KB) + L1i L#7 (64KB) + Core L#7 + PU L#7
> >>>> (P#7)
> >>>> ....
> >>>>
> >>>> I foucused on byobj_span and bynode. I didn't notice byobj was
> > modified,
> >>>> sorry.
> >>>>
> >>>> Tetsuya
> >>>>
> >>>>> Hmmm..what does your node look like again (sockets and cores)?
> >>>>>
> >>>>> On Feb 27, 2014, at 3:19 PM, tmishima_at_[hidden] wrote:
> >>>>>
> >>>>>>
> >>>>>> Hi Ralph, I'm afraid to say your new "map-by obj" causes another
> >>>> problem.
> >>>>>>
> >>>>>> I have overload message with this command line as shown below:
> >>>>>>
> >>>>>> mpirun -np 8 -host node05,node06 -report-bindings -map-by
> > socket:pe=2
> >>>>>> -display-map ~/mis/openmpi/d
> >>>>>> emos/myprog
> >>>>>>
> >>>>
> >>>
> >
--------------------------------------------------------------------------
> >>>>>> A request was made to bind to that would result in binding more
> >>>>>> processes than cpus on a resource:
> >>>>>>
> >>>>>> Bind to: CORE
> >>>>>> Node: node05
> >>>>>> #processes: 2
> >>>>>> #cpus: 1
> >>>>>>
> >>>>>> You can override this protection by adding the "overload-allowed"
> >>>>>> option to your binding directive.
> >>>>>>
> >>>>
> >>>
> >
--------------------------------------------------------------------------
> >>>>>>
> >>>>>> Then, I add "-bind-to core:overload-allowed" to see what happenes.
> >>>>>>
> >>>>>> mpirun -np 8 -host node05,node06 -report-bindings -map-by
> > socket:pe=2
> >>>>>> -display-map -bind-to core:o
> >>>>>> verload-allowed ~/mis/openmpi/demos/myprog
> >>>>>> Data for JOB [14398,1] offset 0
> >>>>>>
> >>>>>> ======================== JOB MAP ========================
> >>>>>>
> >>>>>> Data for node: node05 Num slots: 1 Max slots: 0 Num procs:
4
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 0
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 1
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 2
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 3
> >>>>>>
> >>>>>> Data for node: node06 Num slots: 1 Max slots: 0 Num procs:
4
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 4
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 5
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 6
> >>>>>> Process OMPI jobid: [14398,1] App: 0 Process rank: 7
> >>>>>>
> >>>>>> =============================================================
> >>>>>> [node06.cluster:18443] MCW rank 6 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node05.cluster:20901] MCW rank 2 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node06.cluster:18443] MCW rank 7 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> [node05.cluster:20901] MCW rank 3 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> [node06.cluster:18443] MCW rank 4 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node05.cluster:20901] MCW rank 0 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node06.cluster:18443] MCW rank 5 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> [node05.cluster:20901] MCW rank 1 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> Hello world from process 4 of 8
> >>>>>> Hello world from process 2 of 8
> >>>>>> Hello world from process 6 of 8
> >>>>>> Hello world from process 0 of 8
> >>>>>> Hello world from process 5 of 8
> >>>>>> Hello world from process 1 of 8
> >>>>>> Hello world from process 7 of 8
> >>>>>> Hello world from process 3 of 8
> >>>>>>
> >>>>>> When I add "map-by obj:span", it works fine:
> >>>>>>
> >>>>>> mpirun -np 8 -host node05,node06 -report-bindings -map-by
> >>>> socket:pe=2,span
> >>>>>> -display-map ~/mis/ope
> >>>>>> nmpi/demos/myprog
> >>>>>> Data for JOB [14703,1] offset 0
> >>>>>>
> >>>>>> ======================== JOB MAP ========================
> >>>>>>
> >>>>>> Data for node: node05 Num slots: 1 Max slots: 0 Num procs:
4
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 0
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 2
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 1
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 3
> >>>>>>
> >>>>>> Data for node: node06 Num slots: 1 Max slots: 0 Num procs:
4
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 4
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 6
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 5
> >>>>>> Process OMPI jobid: [14703,1] App: 0 Process rank: 7
> >>>>>>
> >>>>>> =============================================================
> >>>>>> [node06.cluster:18491] MCW rank 6 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> [node05.cluster:20949] MCW rank 2 bound to socket 0[core 2[hwt
0]],
> >>>> socket
> >>>>>> 0[core 3[hwt 0]]: [././B/B][./././.]
> >>>>>> [node06.cluster:18491] MCW rank 7 bound to socket 1[core 6[hwt
0]],
> >>>> socket
> >>>>>> 1[core 7[hwt 0]]: [./././.][././B/B]
> >>>>>> [node05.cluster:20949] MCW rank 3 bound to socket 1[core 6[hwt
0]],
> >>>> socket
> >>>>>> 1[core 7[hwt 0]]: [./././.][././B/B]
> >>>>>> [node06.cluster:18491] MCW rank 4 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node05.cluster:20949] MCW rank 0 bound to socket 0[core 0[hwt
0]],
> >>>> socket
> >>>>>> 0[core 1[hwt 0]]: [B/B/./.][./././.]
> >>>>>> [node06.cluster:18491] MCW rank 5 bound to socket 1[core 4[hwt
0]],
> >>>> socket
> >>>>>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>>>>> [node05.cluster:20949] MCW rank 1 bound to socket 1[core 4[hwt
0]],
> >>>> socket
> >>>>>> 1[core 5[hwt 0]]: [./././.][B/B/./.]
> >>>>>> ....
> >>>>>>
> >>>>>> So, byobj_span would be okay. Of course, bynode and byslot should
be
> >>>> okay.
> >>>>>> Could you take a look at orte_rmaps_rr_byobj again?
> >>>>>>
> >>>>>> Regards,
> >>>>>> Tetsuya Mishima
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> users mailing list
> >>>>>> users_at_[hidden]
> >>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>>>>
> >>>>> _______________________________________________
> >>>>> users mailing list
> >>>>> users_at_[hidden]
> >>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>>>
> >>>> _______________________________________________
> >>>> users mailing list
> >>>> users_at_[hidden]
> >>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>>
> >>> _______________________________________________
> >>> users mailing list
> >>> users_at_[hidden]
> >>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>
> >> _______________________________________________
> >> users mailing list
> >> users_at_[hidden]
> >> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
> > _______________________________________________
> > users mailing list
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