Differences

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--- doku:mpi [2014/03/13 14:29] – external edit 127.0.0.1
+++ doku:mpi [2021/09/14 13:27] – [Process Pinning with MPI] goldenberg
@@ Line 1: / Line 1: @@
-===== MPI environment =====
+====== MPI environment ======
+===== VSC-2 =====
 In your job script use the following parallel environment (-pe option): <code>#$ -pe mpich <slots>
 </code>
@@ Line 6: / Line 7: @@
 Different MPI implementations can be chosen via the command "mpi-selector".\\
-** We recommend using the latest Intel MPI (currently impi-4.1.0.024) on both VSC-1 and VSC-2.**\\
+** We recommend using the latest Intel MPI (currently impi_intel-5.1.1.109) on both VSC-1 and VSC-2.**\\
 On both clusters other MPI Versions (OpenMPI and MVAPICH2) are also available.
-==== Process Pinning with MPI ====
-Most MPI implementations allow a pinning of the MPI processes to specific CPU cores if needed.
-Numbering of the cores on a VSC-1 node with 8 cores:
-<code>
-CPU0 CORE0
-CPU0 CORE1
-CPU0 CORE2
-CPU0 CORE3
-CPU1 CORE4
-CPU1 CORE5
-CPU1 CORE6
-CPU1 CORE7
-</code>
-Numbering of the cores on a VSC-2 node with 16 cores:
-<code>
-CPU0 CORE0
-CPU0 CORE1
-CPU0 CORE2
-CPU0 CORE3
-CPU0 CORE4
-CPU0 CORE5
-CPU0 CORE6
-CPU0 CORE7
-CPU1 CORE8
-CPU1 CORE9
-CPU1 CORE10
-CPU1 CORE11
-CPU1 CORE12
-CPU1 CORE13
-CPU1 CORE14
-CPU1 CORE15
-</code>
-=== Pinning to cores 0,1,2,4,6 ===
-Mvapich:
-<code>
-mpirun  -machinefile $TMPDIR/machines -np 1 -env MV2_CPU_MAPPING 0-2,4,6 ./a.out
-</code>
-Intel MPI:
-<code>
-export I_MPI_PIN_PROCESSOR_LIST=0-2,4,6
-mpirun -machinefile $TMPDIR/machines -np 1 ./a.out
-</code>