<html><body bgcolor="#FFFFFF"><div>Hi,</div><div><br></div><div>Real parallel I/O requires a parallel file system underneath, you can't just bake it into the app. You can use MPI-IO on NFS (with a list of caveats as long as my arm), but you really want a PFS. Otherwise you might as well write independent files or write only from rank 0.<br><br><div>-- Rob</div></div><div><br>On Feb 16, 2011, at 1:32 PM, "Hiatt, Dave M " <<a href="mailto:dave.m.hiatt@citi.com">dave.m.hiatt@citi.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><image001.gif><!--[if gte mso 9]><xml>
<v:background id="_x0000_s1025" o:bwmode="white" o:targetscreensize="1024,768">
<v:fill src="cid:image001.gif@01CBCDEE.AA85FF50" o:title="blutextb" type="frame" />
</v:background></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman","serif";color:windowtext">Is there a default parallel file system baked into MPICH so that MPI-IO is functional without Lustre, PVFS, or GFPS being installed independently on my cluster. I’m getting a lot of pushback from my grid support group, telling me if I want parallel I/O I have to bake it into my app. We write to an NFS mount disk farm. Can I use MPI 1.2.1 out of the box and get parallel I/O through MPI IO? For whatever reason I didn’t find this answer on the web site anywhere. If I missed it, I apologize.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman","serif";color:windowtext"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman","serif";color:windowtext">Ciao<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman","serif";color:windowtext">dave<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman","serif";color:windowtext"><o:p> </o:p></span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN" style="font-size:11.0pt;font-family:"Cambria","serif";color:windowtext">"If there's anything more important than my ego around, I want it caught and shot now." -Zaphod Beeblebrox<o:p></o:p></span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0070C0">Dave M. Hiatt<o:p></o:p></span></b></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">Director, Risk Analytics<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">CitiMortgage<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">1000 Technology Drive<br>O'Fallon, MO 63368-2240<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">Telephone: 636-261-1408<o:p></o:p></span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"><span lang="EN" style="font-family:"Times New Roman","serif";color:windowtext"><o:p> </o:p></span></p><p class="MsoNormal"><o:p> </o:p></p></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>mpich-discuss mailing list</span><br><span><a href="mailto:mpich-discuss@mcs.anl.gov">mpich-discuss@mcs.anl.gov</a></span><br><span><a href="https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss">https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss</a></span><br></div></blockquote></body></html>