Re: [OMPI devel] New binding warnings in master

[Ralph Castain]

In fixing a problem for Mellanox, I noted that we had somehow lost our default 
binding policy intentions - i.e., we were no longer automatically binding by 
default. I fixed that, and so you’d get this if the numactl and numactl-devel 
libs are missing.

I suspect we should eliminate those warnings if we bind by default?

On the other matter: that has been the agreed-upon behavior for some time now. 
If you don’t specify anything, we launch the number of procs equal to the 
number of slots, with the slots auto-detected using hwloc and equating slots to 
number of discovered cores.

However, if you use -host, then we assume you are telling us the number of 
slots=1 for every time you mention the host name. This overrides any 
auto-discovery.

HTH
Ralph


> On Mar 20, 2015, at 8:16 AM, Rolf vandeVaart  wrote:
> 
> Greetings:
>  
> I am now seeing the following message for all my calls to mpirun on ompi 
> master.  This started with last night’s MTT run.  Is this intentional?
>  
> [rvandevaart@ivy0 ~]$ mpirun -np 1 hostname
> --
> WARNING: a request was made to bind a process. While the system
> supports binding the process itself, at least one node does NOT
> support binding memory to the process location.
> 
>   Node:  ivy0
> 
> This usually is due to not having the required NUMA support installed
> on the node. In some Linux distributions, the required support is
> contained in the libnumactl and libnumactl-devel packages.
> This is a warning only; your job will continue, though performance may be 
> degraded.
> --
> ivy0.nvidia.com 
>  
> 
> On another note, I noticed on both 1.8 and master that we get different 
> number of nodes if we specify the hostname.  This is not too big a deal, but 
> surprised me.
> 
> [rvandevaart@ivy0 ~]$ /opt/openmpi/v1.8.4/bin/mpirun hostname
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> ivy0.nvidia.com 
> [rvandevaart@ivy0 ~]$ /opt/openmpi/v1.8.4/bin/mpirun -host ivy0 hostname
> ivy0.nvidia.com 
> [rvandevaart@ivy0 ~]$ 
> 
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[OMPI devel] New binding warnings in master

[Rolf vandeVaart]

Greetings:

I am now seeing the following message for all my calls to mpirun on ompi 
master.  This started with last night's MTT run.  Is this intentional?


[rvandevaart@ivy0 ~]$ mpirun -np 1 hostname
--
WARNING: a request was made to bind a process. While the system
supports binding the process itself, at least one node does NOT
support binding memory to the process location.

  Node:  ivy0

This usually is due to not having the required NUMA support installed
on the node. In some Linux distributions, the required support is
contained in the libnumactl and libnumactl-devel packages.
This is a warning only; your job will continue, though performance may be 
degraded.
--
ivy0.nvidia.com



On another note, I noticed on both 1.8 and master that we get different number 
of nodes if we specify the hostname.  This is not too big a deal, but surprised 
me.

[rvandevaart@ivy0 ~]$ /opt/openmpi/v1.8.4/bin/mpirun hostname
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
ivy0.nvidia.com
[rvandevaart@ivy0 ~]$ /opt/openmpi/v1.8.4/bin/mpirun -host ivy0 hostname
ivy0.nvidia.com
[rvandevaart@ivy0 ~]$

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