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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Are you using any queuing system like SGE, Torque, PBS, etc.? In OpenMPI, the mpirun (and mpiexec) are really just links to orterun. Orterun is smart enough to get the list of hostnames to use from the queuing system.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you're not using a queuing system, then you need to tell orterun which machines to use. There's several ways, see `man orterun`. You could do any of these:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'># cat hosts.txt<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>machine1<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>machine1<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>machine2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>machine2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'># orterun -np 4 -hostfile hosts.txt wrf.exe<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'># mpirun -np 4 -machinefile hosts.txt wrf.exe<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'># orterun -np 4 -host machine1,machine1,machine2,machine2 wrf.exe<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bart Brashers<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> wrf-users-bounces@ucar.edu [mailto:wrf-users-bounces@ucar.edu] <b>On Behalf Of </b>Ahsan Ali<br><b>Sent:</b> Friday, April 01, 2011 8:17 PM<br><b>To:</b> wrfhelp<br><b>Subject:</b> [Wrf-users] WRF running parallel in cluster<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> I want to run WRF on multiple nodes in a linux cluster using openmpi, giving the command <b>mpirun -np 4 ./wrf.exe</b> just submit it to the single node . I don't know how to run it on other nodes as well. Help needed.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Regards,<br clear=all><o:p></o:p></p></div><p class=MsoNormal><br>-- <br>Syed Ahsan Ali Bokhari <br>Electronic Engineer (EE)<o:p></o:p></p><div><p class=MsoNormal><br>Research & Development Division<br>Pakistan Meteorological Department H-8/4, Islamabad.<br>Phone # off +92518358714<o:p></o:p></p></div><div><p class=MsoNormal>Cell # +923155145014<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div>
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