All, <br>I currently run lam-mpi on small commodity clusters. I use lam-mpi with ifort 9.1.3 for compiling and running fortran 90 fluid dynamics codes. <br>I have been running on AMD 2500+ (32bit), P4 (32bit), and AMD 3200+ (64bit) nodes single core without any problems, but when I upgraded to running on AMD 4600+ dual core nodes and Core2Duo e6400 dual core nodes I get the error 
<span style="color: rgb(255, 0, 0);">below</span> after an arbitrary number of iterations. Has anyone had any similar problems using lam-mpi with ifort on these processors? If so have they had any luck addressing the problem? 
<br>Thanks, <br>-DR<br><br><span style="color: rgb(255, 0, 0);">forrtl: severe (174): SIGSEGV, segmentation fault occurred</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Image&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Routine&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Line&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Source
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">a.out&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 000000000042F316&nbsp; Unknown&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unknown&nbsp; Unknown</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">
a.out&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0000000000407B02&nbsp; Unknown&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unknown&nbsp; Unknown</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">a.out&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0000000000404A2A&nbsp; Unknown&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unknown&nbsp; Unknown
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">libc.so.6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 00002B23979484CA&nbsp; Unknown&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unknown&nbsp; Unknown</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">
a.out&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 000000000040496A&nbsp; Unknown&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unknown&nbsp; Unknown</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">MPI_Wait: process in local group is dead (rank 4, MPI_COMM_WORLD)</span>
<br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (4, MPI_COMM_WORLD): Call stack within LAM:</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (4, MPI_COMM_WORLD):&nbsp; - MPI_Wait()
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (4, MPI_COMM_WORLD):&nbsp; - main()</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">MPI_Wait: process in local group is dead (rank 6, MPI_COMM_WORLD)
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (6, MPI_COMM_WORLD): Call stack within LAM:</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (6, MPI_COMM_WORLD):&nbsp; - MPI_Wait()
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (6, MPI_COMM_WORLD):&nbsp; - main()</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">-----------------------------------------------------------------------------
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">One of the processes started by mpirun has exited with a nonzero exit</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">
code.&nbsp; This typically indicates that the process finished in error.</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">If your process did not finish in error, be sure to include a &quot;return</span>
<br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">0&quot; or &quot;exit(0)&quot; in your C code before exiting the application.</span><br style="color: rgb(255, 0, 0);"><br style="color: rgb(255, 0, 0);">
<span style="color: rgb(255, 0, 0);">PID 7033 failed on node n1 (<a href="http://10.6.1.1">10.6.1.1</a>) with exit status 174.</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">-----------------------------------------------------------------------------
</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">MPI_Wait: process in local group is dead (rank 7, MPI_COMM_WORLD)</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">
Rank (7, MPI_COMM_WORLD): Call stack within LAM:</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">Rank (7, MPI_COMM_WORLD):&nbsp; - MPI_Wait()</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">
Rank (7, MPI_COMM_WORLD):&nbsp; - main()</span><br style="color: rgb(255, 0, 0);"><span style="color: rgb(255, 0, 0);">forrtl: severe (174): SIGSEGV, segmentation fault occurred</span><br style="color: rgb(255, 0, 0);"><br clear="all">
<br>-- <br>Regards,<br><br>Daniel A. Reasor Jr.<br>University of Kentucky <br>Mechanical Engineering Department<br>CFD Group<br>151 Ralph G. Anderson Bldg. Rm. 210 <br>Lexington, KY 40506<br>Local: 340 Madison Place Apt #2 
<br>Lexington, KY 40508<br>email: <a href="mailto:dareas0@engr.uky.edu">dareas0@engr.uky.edu</a>, <a href="mailto:dareas0@gmail.com">dareas0@gmail.com</a><br>Office Phone: (859) 257 6336 x80678<br>Cell: (859) 229-5184