Differences

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--- howto:start [2026/02/20 09:48]
ccrosby
+++ howto:start [2026/09/09 09:13] (current)
ccrosby Replaced the "logging in for the first time" video with the Heath Robinson method dictated in 2026.
@@ Line 3: / Line 3: @@
 ===== Video tutorials for newcomers =====
 If you are a new user to the CHPC, please watch these videos:
-  * [[https://youtu.be/fCM8ZaFn4rs|Setting up a cluster password and logging in for the first time]]
+  * [[https://youtu.be/Fq6xT-KjlQ0|The revised login procedure]]
   * [[https://youtu.be/CIEVMlrKXF4|The CHPC's service nodes and using the module system]]
   * [[https://youtu.be/mQjh8J_aMYU|Test running in an interactive PBS session]]
@@ Line 67: / Line 67: @@
 export MPIF77=mpiifx
 export MPIF90=mpiifx
+export I_MPI_HYDRA_BOOTSTRAP=ssh
 </code>
-It is not necessary to use a machinefile for multi-node MPI runs.  However, the default bootstrap method using pbsdsh does not work.  It is necessary to set the bootstrap method to ssh.  This is a typical command mpi run command:
+It is not necessary to use a machinefile for multi-node MPI runs.  However, the default bootstrap method using pbsdsh does not work, hence the need to set ''I_MPI_HYDRA_BOOTSTRAP''.  This is a typical command mpi run command:
 <code>
-mpirun -np 96 -bootstrap ssh myMPIprogram.exe
+mpirun -np 96 myMPIprogram.exe
 </code>

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