From 0130adc1c2fc9fcaa60f21f69ccefcb06c9bcee6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pavel=20Gajdu=C5=A1ek?= <gajdusek.pavel@gmail.com>
Date: Wed, 13 Sep 2017 14:50:27 +0200
Subject: [PATCH] mdlint, tabs
---
docs.it4i/anselm/software/mpi/mpi.md | 36 ++++++++++-----------
docs.it4i/salomon/software/mpi/mpi.md | 46 ++++++++++++++-------------
2 files changed, 42 insertions(+), 40 deletions(-)
diff --git a/docs.it4i/anselm/software/mpi/mpi.md b/docs.it4i/anselm/software/mpi/mpi.md
index 4313bf513..c8e9c7d6d 100644
--- a/docs.it4i/anselm/software/mpi/mpi.md
+++ b/docs.it4i/anselm/software/mpi/mpi.md
@@ -70,31 +70,31 @@ $ mpif90 -v
Example program:
```cpp
- // helloworld_mpi.c
- #include <stdio.h>
+// helloworld_mpi.c
+#include <stdio.h>
- #include<mpi.h>
+#include<mpi.h>
- int main(int argc, char **argv) {
+int main(int argc, char **argv) {
- int len;
- int rank, size;
- char node[MPI_MAX_PROCESSOR_NAME];
+int len;
+int rank, size;
+char node[MPI_MAX_PROCESSOR_NAME];
- // Initiate MPI
- MPI_Init(&argc, &argv);
- MPI_Comm_rank(MPI_COMM_WORLD,&rank);
- MPI_Comm_size(MPI_COMM_WORLD,&size);
+// Initiate MPI
+MPI_Init(&argc, &argv);
+MPI_Comm_rank(MPI_COMM_WORLD,&rank);
+MPI_Comm_size(MPI_COMM_WORLD,&size);
- // Get hostame and print
- MPI_Get_processor_name(node,&len);
- printf("Hello world! from rank %d of %d on host %sn",rank,size,node);
+// Get hostame and print
+MPI_Get_processor_name(node,&len);
+printf("Hello world! from rank %d of %d on host %sn",rank,size,node);
- // Finalize and exit
- MPI_Finalize();
+// Finalize and exit
+MPI_Finalize();
- return 0;
- }
+return 0;
+}
```
Compile the above example with
diff --git a/docs.it4i/salomon/software/mpi/mpi.md b/docs.it4i/salomon/software/mpi/mpi.md
index 99f8745ac..536335b3d 100644
--- a/docs.it4i/salomon/software/mpi/mpi.md
+++ b/docs.it4i/salomon/software/mpi/mpi.md
@@ -71,31 +71,31 @@ Wrappers mpif90, mpif77 that are provided by Intel MPI are designed for gcc and
Example program:
```cpp
- // helloworld_mpi.c
- #include <stdio.h>
+// helloworld_mpi.c
+#include <stdio.h>
- #include<mpi.h>
+#include<mpi.h>
- int main(int argc, char **argv) {
+int main(int argc, char **argv) {
- int len;
- int rank, size;
- char node[MPI_MAX_PROCESSOR_NAME];
+int len;
+int rank, size;
+char node[MPI_MAX_PROCESSOR_NAME];
- // Initiate MPI
- MPI_Init(&argc, &argv);
- MPI_Comm_rank(MPI_COMM_WORLD,&rank);
- MPI_Comm_size(MPI_COMM_WORLD,&size);
+// Initiate MPI
+MPI_Init(&argc, &argv);
+MPI_Comm_rank(MPI_COMM_WORLD,&rank);
+MPI_Comm_size(MPI_COMM_WORLD,&size);
- // Get hostame and print
- MPI_Get_processor_name(node,&len);
- printf("Hello world! from rank %d of %d on host %sn",rank,size,node);
+// Get hostame and print
+MPI_Get_processor_name(node,&len);
+printf("Hello world! from rank %d of %d on host %sn",rank,size,node);
- // Finalize and exit
- MPI_Finalize();
+// Finalize and exit
+MPI_Finalize();
- return 0;
- }
+return 0;
+}
```
Compile the above example with
@@ -117,10 +117,12 @@ The MPI program executable must be available within the same path on all nodes.
Optimal way to run an MPI program depends on its memory requirements, memory access pattern and communication pattern.
-Consider these ways to run an MPI program:
-1\. One MPI process per node, 24 threads per process
-2\. Two MPI processes per node, 12 threads per process
-3\. 24 MPI processes per node, 1 thread per process.
+!!! note
+ Consider these ways to run an MPI program:
+
+ 1. One MPI process per node, 24 threads per process
+ 2. Two MPI processes per node, 12 threads per process
+ 3. 24 MPI processes per node, 1 thread per process.
**One MPI** process per node, using 24 threads, is most useful for memory demanding applications, that make good use of processor cache memory and are not memory bound. This is also a preferred way for communication intensive applications as one process per node enjoys full bandwidth access to the network interface.
--
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