[mpich-discuss] how to make the hosts files

[hyunduk kim]

Thank you for your response.

Best Regards
H.D., Kim

2011/5/12 Mandar Gurav <mandarwce at gmail.com>

> Hi hyunduk !
>
> This is not about the total number of processors.... Its about to
> create number of processes. You can create as many number of processes
> as you can. Simultaneously, only those many processes(in your case 2 X
> 6 = 12) will be executing on the actual processors. Other will be
> waiting for processor quantum (This is Operating system concept.. you
> can refer to any Operating system book...). As you can see in your
> computer many processes(programs) are running simultaneously. Only few
> of the processes are running on the processors and others are waiting
> for their chance. But, you cannot realize this phenomenon because
> within a second Operating system switches among different processes
> for tens of hundreds of times.
>
> You can run your program with 20,25,30 ... processes but only few (12
> in your case) will be executing...
>
> -- Mandar Gurav
>
> On Thu, May 12, 2011 at 6:41 PM, hyunduk kim <fororigin at gmail.com> wrote:
> > 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
> >
> >
>
>
>
> --
> Mandar Gurav
> http://www.mandargurav.org
>
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