[mpich-discuss] how to make the hosts files

[hyunduk kim]

Dear Pavan

The hostname of My linux machine is francium.ac.kr.
And I removed my machine as your comment.

I received message as like

[root at francium machine]# mpiexec -n 11
/usr/local/mpich2-1.3.2p1/examples/cpi
Process 0 of 11 is on francium
Process 2 of 11 is on francium
Process 3 of 11 is on francium
Process 4 of 11 is on francium
Process 5 of 11 is on francium
Process 7 of 11 is on francium
Process 8 of 11 is on francium
Process 9 of 11 is on francium
Process 10 of 11 is on francium
Process 6 of 11 is on francium
Process 1 of 11 is on francium
pi is approximately 3.1415926544231247, Error is 0.0000000008333316
wall clock time = 0.000453

In above command, the option " -n 11" means that some program is going to
use the 11 machine.
Then I modified my run command as below message.

[root at francium machine]# mpiexec -n 16
/usr/local/mpich2-1.3.2p1/examples/cpi
Process 0 of 16 is on francium
Process 1 of 16 is on francium
Process 2 of 16 is on francium
Process 3 of 16 is on francium
Process 4 of 16 is on francium
Process 6 of 16 is on francium
Process 7 of 16 is on francium
Process 8 of 16 is on francium
Process 9 of 16 is on francium
Process 12 of 16 is on francium
Process 14 of 16 is on francium
Process 10 of 16 is on francium
Process 15 of 16 is on francium
Process 11 of 16 is on francium
Process 13 of 16 is on francium
Process 5 of 16 is on francium
pi is approximately 3.1415926544231274, Error is 0.0000000008333343
wall clock time = 0.000500

In this command, I expected the error message because my linux machine is
composed of 2 CPU, and each CPU has the 6 core.(Then my machine for mpich2
is just 12.)

Question is the meaning of the option "-n" in execute command.

Thank for your kindness


H.D., Kim






2011/5/12 Pavan Balaji <balaji at mcs.anl.gov>

>
> Is there an actual machine with the name "host1" or "host2" in your setup?
>
> If you are just running it on the local node, you should not give the
> -machinefile or -f option.
>
>  -- Pavan
>
>
> On 05/12/2011 03:28 AM, hyunduk kim wrote:
>
>>
>> Thanks for your response
>> However, my setup is not working.
>>
>> In my check progress.
>> 1) I installed mpich2 on intel muti-core 2 cpu machine
>> 2) check : /etc/hosts file
>>     127.0.0.1               localhost.localdomain localhost
>>     ::1                        localhost6.localdomain6 localhost6
>>
>> 3) made the machinefile for mpiexec :
>> /usr/local/mpich2/machine/machinefile
>>
>>  host1:6
>>  host2:6
>>
>> 4) run : [root at francium machine]# mpiexec -n 10 -machinefile
>> ./machinefile /usr/local/mpich2-1.3.2p1/examples/cpi
>>    ==> I received messages as below
>>          ssh: connect to host host1 port 22: Connection timed out
>>          ssh: connect to host host2 port 22: Connection timed out
>>
>>   Question is :
>> 1) why do I setup passwordless login among the two hosts?
>> 2) Mpich2 was installed on the just multi-core 2 cpu machine. Why dose
>> the mpiexec try to connect host1 and host2 using port 22 ?
>> 3) Is there other method for defining the machinefile on the multi-core
>> 2 cpu machine ?
>>
>>  I will attach my log files.
>>
>>
>>
>>
>> _______________________________________________
>> mpich-discuss mailing list
>> mpich-discuss at mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>>
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20110512/7d62e6e4/attachment-0001.htm>