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<title>How to use mutliple interfaces in Windows?</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There are several ways to specify specific
host names or ip addresses under Windows:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Use the MPICH_NETMASK environment variable<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Assign ip addresses to your NICs so that each set of cards is in
its own ip address subnet. For example, if we have a dual NIC cluster
with 100Mb cards and 1000Mb cards we could assign ip addresses for the 100Mb
cards like this: 140.221.10.1, 140.221.10.2, … and for the 1000Mb cards
like this: 140.221.11.1, 140.221.11.2, … The 100Mb cards would be
on the 140.221.10 subnet while the 1000Mb cards would be on the 140.221.11
subnet. Then we could run jobs on either subnet like this: mpiexec -env
MPICH_NETMASK 140.221.10.0/24 -n 4 app or like this: mpiexec -env MPICH_NETMASK
140.221.11.0/24 -n 4 app.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Use the MPICH_INTERFACE_HOSTNAME environment variable<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Run jobs specifying the host name to use for each host like this:
mpiexec -env MPICH_INTERFACE_HOSTNAME 140.221.10.1 -host a -n 1 app : -env
MPICH_INTERFACE_HOSTNAME 140.221.10.2 -host b -n 1 app : -env
MPICH_INTERFACE_HOSTNAME 140.221.10.3 -host c -n 1 app …<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>3)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Use the -ifhn option to the machine file<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>a.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Create a machine file with lines like this: hostA -ifhn
140.221.10.1. Then run the job like this: mpiexec -machinefile foo -n 4
app<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Assigning host names to ip addresses is
the job of the DNS server, not the local host. You can set up your DNS
server to return 140.221.10.1 for hostA or hostA-mb and 140.221.11.1 for
hostA-gig.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-David Ashton<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
owner-mpich-discuss@mcs.anl.gov [mailto:owner-mpich-discuss@mcs.anl.gov] <b><span
style='font-weight:bold'>On Behalf Of </span></b>David Minor<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 27, 2005 6:36
AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'mpich-discuss@mcs.anl.gov'<br>
<b><span style='font-weight:bold'>Subject:</span></b> [MPICH] How to use
mutliple interfaces in Windows?</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p style='margin-left:.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Windows does not allow assigning different host names
to different interfaces, how can I tell MPI to use a specific interface?</span></font><o:p></o:p></p>
<p style='margin-left:.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>David</span></font> <o:p></o:p></p>
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