From b93d5115a40ca6e914517aaa3b3eead3a1efedee Mon Sep 17 00:00:00 2001
From: Joern Behrens <joern.behrens@uni-hamburg.de>
Date: Fri, 18 Jun 2021 12:42:36 +0200
Subject: [PATCH] initial commit of HelloMP

---
 .gitignore |  5 +++++
 Hello.c    | 33 +++++++++++++++++++++++++++++++++
 Makefile   | 33 +++++++++++++++++++++++++++++++++
 README.md  | 41 ++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 111 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore
 create mode 100644 Hello.c
 create mode 100644 Makefile

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b097b01
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# compilation residuals
+*.o
+
+# main file
+Hello
diff --git a/Hello.c b/Hello.c
new file mode 100644
index 0000000..a65bff3
--- /dev/null
+++ b/Hello.c
@@ -0,0 +1,33 @@
+/*****************************************************************
+
+ NAME:
+	Hello
+
+ Description:
+	this is about the simplest program thinkable to demonstrate 
+	parallel execution with OpenMP
+
+ VERSION(S):
+	1. original version		j. behrens	6/2021
+
+*****************************************************************/
+
+#include <stdio.h>
+#include <omp.h>
+
+int main(int argc, char** argv)
+{
+
+/* local declarations */
+	int thrd_id;
+
+/* this is the main print statement parallelized! */
+
+#pragma omp parallel private(thrd_id)
+    {
+        thrd_id = omp_get_thread_num();
+        printf("Hello from process Number %d\n", thrd_id);
+    }
+
+    return 0;
+} /* end of main */
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..baa4198
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,33 @@
+# sample makefile for the C PPTemplate
+# j. behrens 06/2021
+
+CC = gcc
+#
+# THIS OPTION IS FOR THE DATA PARALLEL VERSION (-mp)
+CCFLAGS = -fopenmp -I/opt/local/include
+
+DATLIBS= -lgomp -lm
+
+OBJECTS = \
+Hello.o 
+
+
+# default make
+
+all::
+	@make Hello
+	@make clear
+
+# make object files
+
+.c.o:
+	${CC} ${CCFLAGS} -c $<
+
+# make target (executable)
+
+Hello: ${OBJECTS}
+	${CC} ${CCFLAGS} -o $@ ${OBJECTS} ${LIBS}
+
+clear::
+	@rm *.o
+
diff --git a/README.md b/README.md
index 217ab61..2b884c9 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,40 @@
-# HelloMP
\ No newline at end of file
+# HelloMP
+
+Yet another Hello World Program
+
+## Description and Purpose
+
+This O(1)-line code demonstrates parallelization with OpenMP
+
+## Contents of this Project
+
+```
+README    - this file
+Makefile  - Makefile tested for macOS
+Hello.c   - parallelized "Hello World" C-program
+```
+
+## What do do here
+
+**First**, build the executable by typing
+
+```
+%> make
+```
+
+If this fails, you have to adjust your path and settings, however,
+I don't know how...
+
+**Second**, set up the number of threads (e.g. to four)
+
+```
+%> export OMP_NUM_THREADS=4
+```
+
+**Third**, run the program
+
+```
+%> Hello
+```
+
+(c) 2021, Jörn Behrens (joern.behrens@uni-hamburg.de)
-- 
GitLab