From: W. Trevor King <wking@drexel.edu>
Date: Thu, 16 Sep 2010 02:52:36 +0000 (-0400)
Subject: Cleaned up src/sorting/.
X-Git-Url: http://git.tremily.us/?p=parallel_computing.git;a=commitdiff_plain;h=91f2bd5dd05e5e0ce3730274934dea52d795a661

Cleaned up src/sorting/.
---

diff --git a/content/sorting_algorithms/index.shtml b/content/sorting_algorithms/index.shtml
index f3b8a9d..e639763 100644
--- a/content/sorting_algorithms/index.shtml
+++ b/content/sorting_algorithms/index.shtml
@@ -41,9 +41,9 @@ data points.</p>
 use bubble sorting in production code.</p>
 
 <p>Nevertheless, here is a simple implementation of the bubble sort
-algorithm. The code <a href="src/bubble.c">bubble.c</a> generates a
-list of random numbers which are then ordered. The bubble sort
-algorithm is certainly the easiest to implement and therefore the
+algorithm. The code <a href="../../src/sorting/bubble.c">bubble.c</a>
+generates a list of random numbers which are then ordered. The bubble
+sort algorithm is certainly the easiest to implement and therefore the
 easiest to parallelize.</p>
 
 <h3 id="par-bubble">Parallel Bubble Sort</h3>
@@ -82,11 +82,12 @@ random to totally ordered.</p>
     sorted.</li>
 </ul>
 
-<p><a href="src/quicksort.c">quicksort.c</a> implements this
-algorithm.</p>
+<p><a href="../../src/sorting/quicksort.c">quicksort.c</a> implements
+this algorithm.</p>
 
 <p>The merge component of this parallel implementation is the hardest
-to code. The data set <a href="src/multi_lists">multi_lists</a>, which
+to code. The data
+set <a href="../../src/sorting/multi_lists">multi_lists</a>, which
 contains three short lists, can be used to practice with.</p>
 
 <h3 id="par-quick">Parallel Quicksort Algorithm</h3>
@@ -102,6 +103,9 @@ worker nodes.</p>
 
 <h2 id="references">References</h2>
 
+The examples from this section are bundled in
+<a href="../../src/sorting/sorting.tar.gz">sorting.tar.gz</a>.
+
 <ul>
   <li><a href="http://www.nr.com/">Numerical Recipes</a> describes many
     of the most common algorithms.</li>
diff --git a/src/average/Makefile b/src/average/Makefile
index 8e41ced..e74021f 100644
--- a/src/average/Makefile
+++ b/src/average/Makefile
@@ -25,7 +25,7 @@ MPI_EXECS     = average_parallel
 all: $(EXECS) $(MPI_EXECS) $(DATA)
 
 clean:
-	$(RM) -f *.o $(EXECS) $(DATA)
+	$(RM) -f *.o $(EXECS) $(MPI_EXECS) $(DATA)
 
 # Non-MPI rules
 
diff --git a/src/average/average.c b/src/average/average.c
index 5140889..906e718 100644
--- a/src/average/average.c
+++ b/src/average/average.c
@@ -88,6 +88,6 @@ int read_data(const char *file_name, int *pN, double **pData) {
     }
 
   // close the file
-  fclose (fp);                                
+  fclose(fp);
   return EXIT_SUCCESS;
 }
diff --git a/src/sorting/Makefile b/src/sorting/Makefile
new file mode 100644
index 0000000..ec89dfe
--- /dev/null
+++ b/src/sorting/Makefile
@@ -0,0 +1,35 @@
+# General Environment
+
+RM            = /bin/rm
+DATA_SIZE     = 8191  # the 5th Mersenne prime
+DATA          = data
+
+# Non-MPI Environment
+
+CC            = /usr/bin/gcc
+CFLAGS        =
+LD            = $(CC)
+LDFLAGS       = -lm
+EXECS         = bubble quicksort
+
+# Top level targets
+
+all: $(EXECS) $(DATA)
+
+clean:
+	$(RM) -f *.o $(EXECS) $(DATA)
+
+# Lower level rules
+
+data : data.py
+	./$< $(DATA_SIZE) > $@
+
+$(EXECS:%=%.o) main.o : %.o : %.c main.h
+	$(CC) -c $(CFLAGS) -o $@ $<
+
+$(EXECS) : % : main.o %.o
+	$(LD) $(LDFLAGS) -o $@ $^
+
+# Interesting Makefile sections
+#   4.12.1 Syntax of Static Pattern Rules
+#   6.3.1  Substitution References
diff --git a/src/sorting/README b/src/sorting/README
new file mode 100644
index 0000000..9506a9d
--- /dev/null
+++ b/src/sorting/README
@@ -0,0 +1,41 @@
+sorting
+=======
+
+Various sorting algorithms.
+
+Manifest
+--------
+
+===========  ===============================================
+README       This file.
+Makefile     Automate building and cleanup.
+data.py      Generate random data for the 'data' file.
+main.c/.h    Command line framework for a sorting algorithm.
+bubble.c     Bubble sort algorithm for main.c/.h.
+quicksort.c  Quicksort algorithm for main.c/.h.
+===========  ===============================================
+
+Build
+-----
+
+Just run
+
+    $ make
+
+which also builds a random data file 'data'.
+
+Usage
+-----
+
+    $ ./qicksort data
+    $ ./bubble data
+
+Timing
+------
+
+Timing 8191 data points on my 571 MHz netbook with
+
+    $ time ./quicksort data > /dev/null
+    $ time ./quicksort data > /dev/null
+
+quicksort takes 0.075 s and bubble takes 3.994s.
diff --git a/src/sorting/bubble.c b/src/sorting/bubble.c
index 6568313..d747d63 100644
--- a/src/sorting/bubble.c
+++ b/src/sorting/bubble.c
@@ -1,41 +1,11 @@
+/* Bubble sort algorithm */
 
-//
-//               Bubble sort algorithm
-//
-//                                        Michel Vallieres, 2009
-//
+/* Michel Vallieres, 2009 */
 
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include "main.h"
 
 
-void init( double * list, int list_size )
-{
-  int i;
-
-  for( i=0; i<list_size ; i++ )
-    {
-      list[i] = (double)rand()/(double)RAND_MAX;
-    }
-}
-
-
-void printlist(double * list, int n, int list_size )
-{
-   int i;
-   for(i=0;i<n;i++)
-      printf("%f\t",list[i]);
-   printf("\n");
-   for(i=n;i>0;i--)
-      printf("%f\t",list[list_size-i]);
-   printf("\n");
-}
-
-
-
-void sort( double * list, int list_size )
+void sort(int list_size, double *list)
 {
   double temp;
   int i, exchange;
@@ -56,45 +26,3 @@ void sort( double * list, int list_size )
 	}
     }
 }
-
-
-double checklist(double list[], int list_size )
-{
-  int i;
-  double sum;
-
-  sum = 0.0;
-  for(i = 0; i < list_size; i++ )
-    sum = sum + list[i];
-  return sum;
-}
-
-
-int main ( int argc, char *argv[] )
-{
-  const int MAX_ELEMENTS = 1000000;
-  double list[MAX_ELEMENTS];
-  int list_size;
-
-                         /* size of lit */
-  list_size = 1000;
-
-                         /* initial a list of random numbers */
-  init( list, list_size );
-
-                         /* print initial list */ 
-  printf("The list before sorting is:\n");
-  printlist( list, 3, list_size );
-  printf( "Check: sum of %d elements = %f\n",
-          list_size, checklist( list, list_size ) );
-
-                         /* sort out the list */
-                         /* via bubble sort algorithm */
-  sort( list, list_size );
-
-                         /* print final list */ 
-  printf("The list after sorting is:\n");
-  printlist( list, 3, list_size );
-  printf( "Check: sum of %d elements = %f\n",
-          list_size, checklist( list, list_size ) );
-}
diff --git a/src/sorting/data.py b/src/sorting/data.py
new file mode 100755
index 0000000..1d948ff
--- /dev/null
+++ b/src/sorting/data.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+
+import random
+import sys
+
+N = int(sys.argv[1])
+data = range(N)
+random.shuffle(data)
+
+print '# %d' % N
+print '\n'.join([str(x) for x in data])
diff --git a/src/sorting/main.c b/src/sorting/main.c
new file mode 100644
index 0000000..65d00d9
--- /dev/null
+++ b/src/sorting/main.c
@@ -0,0 +1,104 @@
+/* Sorting utility */
+
+/* Michel Vallieres, 2009 */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "main.h"
+
+
+void printlist(FILE *stream, int list_size, double *list, int num_shown)
+{
+  int i;
+  for(i=0; i < num_shown; i++)
+    fprintf(stream, "%f\t", list[i]);
+  fprintf(stream, "\n");
+  for(i=num_shown; i > 0 ; i--)
+    fprintf(stream, "%f\t", list[list_size-i]);
+  fprintf(stream, "\n");
+}
+
+double checklist(int list_size, double *list)
+{
+  int i;
+  double sum;
+
+  sum = 0.0;
+  for(i = 0; i < list_size; i++ )
+    sum = sum + list[i];
+  return sum;
+}
+
+int read_data(const char *file_name, int *pList_size, double **pList) {
+  FILE   *fp;
+  int    i;
+  double x;
+
+  // open the file
+  if ((fp = fopen(file_name, "r")) == NULL)
+    {
+      fprintf(stderr, "error in opening data file %s\n", file_name);
+      return EXIT_FAILURE;
+    }
+
+  // read the size of the data file
+  fscanf(fp, "# %d", pList_size);
+
+  // allocate memory for the data
+  *pList = (double *)malloc(sizeof(double)* *pList_size);
+  if (*pList == NULL)
+    {
+      fprintf(stderr, "could not allocate %d bytes\n",
+	      sizeof(double)* *pList_size);
+      return EXIT_FAILURE;
+    }
+
+  // read in the data
+  fprintf(stderr, "reading %d points\n", *pList_size);
+  for (i=0; i < *pList_size ; i++)
+    {
+      fscanf(fp, "%lf", &x);
+      (*pList)[i] = x;
+    }
+
+  // close the file
+  fclose(fp);
+  return EXIT_SUCCESS;
+}
+
+
+int main ( int argc, char *argv[] )
+{
+  int    list_size, i;
+  double *list;
+  char   *file_name = "data";
+
+  // parse arguments
+  if (argc > 1)
+    file_name = argv[1];
+
+  // setup
+  if (read_data(file_name, &list_size, &list) != EXIT_SUCCESS)
+    return EXIT_FAILURE;
+
+  /* print initial list */
+  fprintf(stderr, "The list before sorting is:\n");
+  printlist(stderr, list_size, list, 3);
+  fprintf(stderr, "Check: sum of %d elements = %f\n",
+	  list_size, checklist(list_size, list));
+
+  /* sort the list */
+  sort(list_size, list);
+
+  /* print final list */
+  fprintf(stderr, "The list after sorting is:\n");
+  printlist(stderr, list_size, list, 3);
+  fprintf(stderr, "Check: sum of %d elements = %f\n",
+	  list_size, checklist(list_size, list));
+  for (i=0; i < list_size; i++)
+    printf("%f\n", list[i]);
+
+  return EXIT_SUCCESS;
+}
diff --git a/src/sorting/main.h b/src/sorting/main.h
new file mode 100644
index 0000000..0b43b5e
--- /dev/null
+++ b/src/sorting/main.h
@@ -0,0 +1,2 @@
+/* sort a list `list` of `list_size` elements in place. */
+void sort(int list_size, double *list);
diff --git a/src/sorting/multi_lists b/src/sorting/multi_lists
deleted file mode 100644
index 7452d1b..0000000
--- a/src/sorting/multi_lists
+++ /dev/null
@@ -1,4867 +0,0 @@
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diff --git a/src/sorting/quicksort.c b/src/sorting/quicksort.c
index 1a5943f..927c43a 100644
--- a/src/sorting/quicksort.c
+++ b/src/sorting/quicksort.c
@@ -1,50 +1,31 @@
+/* Quicksort algorithm */
 
-//
-//               quicksort algorithm
-//
-//                                    Michel Vallieres, 2009
-//                                   
-//  ref: http://cprogramminglanguage.net/quicksort-algorithm-c-source-code.aspx
-//       Numerical Recipes
-// 
-
-#include <stdio.h>
-#include <stdlib.h> 
-
-
-void init( double * list, int list_size )
-{
-  int i;
-
-  for( i=0; i<list_size ; i++ )
-    {
-      list[i] = (double)rand()/(double)RAND_MAX;
-    }
-}
-
+/* Michel Vallieres, 2009
+ *                                   
+ *  ref: http://cprogramminglanguage.net/quicksort-algorithm-c-source-code.aspx
+ *       Numerical Recipes
+ */ 
 
 void swap(double *x, double *y)
 {
-   double temp;
-   temp = *x;
-   *x = *y;
-   *y = temp;
+  double temp;
+  temp = *x;
+  *x = *y;
+  *y = temp;
 }
 
-
 int choose_pivot(int i,int j )
 {
-   return((i+j) /2);
+  return((i+j) /2);
 }
 
-
 void quicksort( double list[], int m, int n )
 {
-   int i,j,k;
-   double key;
+  int i,j,k;
+  double key;
 
-   if( m < n)
-   {
+  if( m < n)
+    {
       k = choose_pivot(m,n);
       swap(&list[m],&list[k]);
       key = list[m];
@@ -52,75 +33,24 @@ void quicksort( double list[], int m, int n )
 
       j = n;
       while(i <= j)
-      {
-         while((i <= n) && (list[i] <= key))
-                i++;
-         while((j >= m) && (list[j] > key))
-                j--;
-         if( i < j)
-                swap(&list[i],&list[j]);
-      }
-	  // swap two elements
+	{
+	  while((i <= n) && (list[i] <= key))
+	    i++;
+	  while((j >= m) && (list[j] > key))
+	    j--;
+	  if( i < j)
+	    swap(&list[i],&list[j]);
+	}
+      // swap two elements
       swap(&list[m],&list[j]);
 
-	  // recursively sort the lesser list
+      // recursively sort the lesser list
       quicksort(list,m,j-1);
       quicksort(list,j+1,n);
-   }
-}
-
-
-void printlist(double list[],int n, int list_size)
-{
-   int i;
-   for(i=0;i<n;i++)
-      printf("%f\t",list[i]);
-   printf("\n");
-   for(i=n;i>0;i--)
-      printf("%f\t",list[list_size-i]);
-   printf("\n");
-}
-
-
-double checklist(double list[], int list_size )
-{
-  int i;
-  double sum;
-
-  sum = 0.0;
-  for(i = 0; i < list_size; i++ )
-    sum = sum + list[i];
-  return sum;
+    }
 }
 
-
-int main()
+void sort(int list_size, double *list)
 {
-   const int MAX_ELEMENTS = 1000000;
-   double list[MAX_ELEMENTS];
-   int i, list_size;
-
-   // size of lit 
-   list_size = 1000;
-
-   i = 0;
-   
-   // generate a list of random numbers
-   init( list, list_size );
-
-   // print initial list
-   printf("The list before sorting is:\n");
-   printlist(list,3,list_size);
-   printf( "Check: sum of %d elements = %f\n",
-	   list_size, checklist( list, list_size ) );
-   
-   // sort the list using quicksort
-   quicksort(list,0,list_size-1);
-
-   // print the result
-   printf("The list after sorting using quicksort algorithm:\n");
-   printlist(list,3,list_size);
-   printf( "Check: sum of %d elements = %f\n",
-	   list_size, checklist( list, list_size ) );
-
+  quicksort(list, 0, list_size-1);
 }