2.6.9-78.0.17.ELpapismp #1 SMP Tue Apr 7 13:14:04 CDT 2009 x86_64 x86_64 x86_64 GNU/Linux

On Thu, Mar 17, 2011 at 2:55 PM, Ralph Castain <rhc@open-mpi.org> wrote:

What OS version is it?

uname -a

will tell you, if you are on linux.

On Mar 17, 2011, at 1:31 PM, vaibhav dutt wrote:

Hi,

Thanks for your reply. I tried to execute first a process by using

mpirun -machinefile hostfile.txt  --slot-list 0:1   -np 1

but it gives the same as error as mentioned previously.

Then, I created a rankfile with contents"

rank 0=t1.tools.xxx  slot=0:0
rank 1=t1.tools.xxx  slot=1:0.

and the  used command

mpirun -machinefile hostfile.txt --rankfile my_rankfile.txt   -np 2

but ended  up getting same error. Is there any patch that I can install in my system to make it
topology aware?

Thanks

On Thu, Mar 17, 2011 at 2:05 PM, Ralph Castain <rhc@open-mpi.org> wrote:

The error is telling you that your OS doesn't support queries telling us what cores are on which sockets, so we can't perform a "bind to socket" operation. You can probably still "bind to core", so if you know what cores are in which sockets, then you could use the rank_file mapper to assign processes to groups of cores in a socket.

It's just that we can't do it automatically because the OS won't give us the required info.

See "mpirun -h" for more info on slot lists.

On Mar 17, 2011, at 11:26 AM, vaibhav dutt wrote:

> Hi,
>
> I am trying to perform an experiment in which I can spawn 2 MPI processes, one on each socket in a 4 core node
> having 2 dual cores. I used the option  "bind to socket" which mpirun for that but I am getting an error like:
>
> An attempt was made to bind a process to a specific hardware topology
> mapping (e.g., binding to a socket) but the operating system does not
> support such topology-aware actions.  Talk to your local system
> administrator to find out if your system can support topology-aware
> functionality (e.g., Linux Kernels newer than v2.6.18).
>
> Systems that do not support processor topology-aware functionality cannot
> use "bind to socket" and other related functionality.
>
>
> Can anybody please tell me what is this error about. Is there any other option than "bind to socket"
> that I can use.
>
> Thanks.

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