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<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12">Hello,<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12">My mpich2 was configured as follows<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">[eng923@cops-021026 job]$ mpich2version<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 Version: 1.2.1p1<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 Release date: Unknown, built on Mon Mar 29 14:37:13 BST 2010<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 Device: ch3:nemesis<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 configure: --prefix=/opt/mpich2<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 CC: gcc -O2<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 CXX: c++ -O2<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 F77: gfortran -O2<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">MPICH2 F90: f95 -O2<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="Courier New"><span style="font-size:10.0pt;font-family:"Courier New"">When I read the following (see below) in migrating from mpich1 to mpich2, is this possibly causding the problem in mpi_scatter?
As I am using an Intel fortran compiler on a 64 bit linux platform? Would I need to reinstall and configure MPIch2 and where and how do I include the
</span></font><font size="2" face="CMTT10"><span style="font-size:11.0pt;font-family:CMTT10">F90FLAGS "-i4" statement on a bash Shell?</span></font><font face="CMBX12"><span style="font-family:CMBX12"><o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12">D.4 Q: When I use the g95 Fortran compiler on a 64-bit<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="3" face="CMBX12"><span style="font-size:12.0pt;font-family:CMBX12">platform, some of the tests fail<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">A: The g95 compiler incorrectly defines the default Fortran integer as a 64-<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">bit integer while defining Fortran reals as 32-bit values (the Fortran standard<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">requires that INTEGER and REAL be the same size). This was apparently<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">done to allow a Fortran INTEGER to hold the value of a pointer, rather<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">than requiring the programmer to select an INTEGER of a suitable KIND.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">To force the g95 compiler to correctly implement the Fortran standard, use<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">the
</span></font><font size="2" face="CMTT10"><span style="font-size:11.0pt;font-family:CMTT10">-i4
</span></font><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">flag. For example, set the environment variable
</span></font><font size="2" face="CMTT10"><span style="font-size:11.0pt;font-family:CMTT10">F90FLAGS
</span></font><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">before<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">configuring MPICH2:<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMTT10"><span style="font-size:11.0pt;font-family:CMTT10">setenv F90FLAGS "-i4"<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">G95 users should note that there (at this writing) are two distributions of<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">g95 for 64-bit Linux platforms. One uses 32-bit integers and reals (and<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">conforms to the Fortran standard) and one uses 32-bit integers and 64-bit<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">reals. We recommend using the one that conforms to the standard (note<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">that the standard specifies the
</span></font><i><font size="2" face="CMTI10"><span style="font-size:11.0pt;font-family:CMTI10;font-style:
italic">ratio
</span></font></i><font size="2" face="CMR10"><span style="font-size:
11.0pt;font-family:CMR10">of sizes, not the absolute sizes, so a<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">Fortran 95 compiler that used 64 bits for
</span></font><i><font size="2" face="CMTI10"><span style="font-size:11.0pt;
font-family:CMTI10;font-style:italic">both
</span></font></i><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">INTEGER and REAL would<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">also conform to the Fortran standard. However, such a compiler would need<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMR10"><span style="font-size:11.0pt;font-family:CMR10">to use 128 bits for DOUBLE PRECISION quantities).</span></font><font size="2" face="CMR10"><span style="font-size:10.0pt;
font-family:CMR10"><o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMBX12"><span style="font-size:10.0pt;font-family:CMBX12"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-autospace:none"><font size="2" face="CMBX12"><span style="font-size:10.0pt;font-family:CMBX12">Thanks kate<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
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