Dear Pavan<div><br></div><div>The hostname of My linux machine is <a href="http://francium.ac.kr">francium.ac.kr</a>. </div><div>And I removed my machine as your comment. </div><div><br></div><div>I received message as like</div>
<div><br></div><div><div><font class="Apple-style-span" color="#3333ff">[root@francium machine]# mpiexec -n 11 /usr/local/mpich2-1.3.2p1/examples/cpi</font></div><div><font class="Apple-style-span" color="#3333ff">Process 0 of 11 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 2 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 3 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 4 of 11 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 5 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 7 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 8 of 11 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 9 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 10 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 6 of 11 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 1 of 11 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">pi is approximately 3.1415926544231247, Error is 0.0000000008333316</font></div>
<div><font class="Apple-style-span" color="#3333ff">wall clock time = 0.000453</font></div></div><div><br></div><div>In above command, the option " -n 11" means that some program is going to use the 11 machine.</div>
<div>Then I modified my run command as below message. </div><div><br></div><div><font class="Apple-style-span" color="#3333ff">[root@francium machine]# mpiexec -n 16 /usr/local/mpich2-1.3.2p1/examples/cpi</font></div><div>
<div><font class="Apple-style-span" color="#3333ff">Process 0 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 1 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 2 of 16 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 3 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 4 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 6 of 16 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 7 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 8 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 9 of 16 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 12 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 14 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 10 of 16 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 15 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 11 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">Process 13 of 16 is on francium</font></div>
<div><font class="Apple-style-span" color="#3333ff">Process 5 of 16 is on francium</font></div><div><font class="Apple-style-span" color="#3333ff">pi is approximately 3.1415926544231274, Error is 0.0000000008333343</font></div>
<div><font class="Apple-style-span" color="#3333ff">wall clock time = 0.000500</font></div></div><div><br></div><div>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.)</div>
<div><br></div><div>Question is the meaning of the option "-n" in execute command.</div><div><br></div><div>Thank for your kindness</div><div><br></div><div><br></div><div>H.D., Kim</div><div><br></div><div><br>
</div><div><br></div><div><br></div><div><br><br><div class="gmail_quote">2011/5/12 Pavan Balaji <span dir="ltr"><<a href="mailto:balaji@mcs.anl.gov">balaji@mcs.anl.gov</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
Is there an actual machine with the name "host1" or "host2" in your setup?<br>
<br>
If you are just running it on the local node, you should not give the -machinefile or -f option.<br><font color="#888888">
<br>
-- Pavan</font><div><div></div><div class="h5"><br>
<br>
On 05/12/2011 03:28 AM, hyunduk kim wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div class="h5">
<br>
Thanks for your response<br>
However, my setup is not working.<br>
<br>
In my check progress.<br>
1) I installed mpich2 on intel muti-core 2 cpu machine<br>
2) check : /etc/hosts file<br>
127.0.0.1 localhost.localdomain localhost<br>
::1 localhost6.localdomain6 localhost6<br>
<br>
3) made the machinefile for mpiexec : /usr/local/mpich2/machine/machinefile<br>
<br>
host1:6<br>
host2:6<br>
<br>
4) run : [root@francium machine]# mpiexec -n 10 -machinefile<br>
./machinefile /usr/local/mpich2-1.3.2p1/examples/cpi<br>
==> I received messages as below<br>
ssh: connect to host host1 port 22: Connection timed out<br>
ssh: connect to host host2 port 22: Connection timed out<br>
<br>
Question is :<br>
1) why do I setup passwordless login among the two hosts?<br>
2) Mpich2 was installed on the just multi-core 2 cpu machine. Why dose<br>
the mpiexec try to connect host1 and host2 using port 22 ?<br>
3) Is there other method for defining the machinefile on the multi-core<br>
2 cpu machine ?<br>
<br>
I will attach my log files.<br>
<br>
<br>
<br>
<br></div></div><div class="im">
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<br>
-- <br><div><div></div><div class="h5">
Pavan Balaji<br>
<a href="http://www.mcs.anl.gov/~balaji" target="_blank">http://www.mcs.anl.gov/~balaji</a><br>
</div></div></blockquote></div><br></div>