Original files from Nvidia for the OpenACC course:

OpenACC - 2X in 4 Steps in C/C++

lab1/C/task1/task1.c

@@ -0,0 +1,69 @@
+#include <math.h>
+#include <string.h>
+#include <openacc.h>
+#include "timer.h"
+#include <stdio.h>
+
+#define NN 1024
+#define NM 1024
+
+float A[NN][NM];
+float Anew[NN][NM];
+
+int main(int argc, char** argv)
+{
+    int i,j;
+    const int n = NN;
+    const int m = NM;
+    const int iter_max = 1000;
+    
+    const double tol = 1.0e-6;
+    double error     = 1.0;
+    
+    memset(A, 0, n * m * sizeof(float));
+    memset(Anew, 0, n * m * sizeof(float));
+        
+    for (j = 0; j < n; j++)
+    {
+        A[j][0]    = 1.0;
+        Anew[j][0] = 1.0;
+    }
+    
+    printf("Jacobi relaxation Calculation: %d x %d mesh\n", n, m);
+    
+    StartTimer();
+    int iter = 0;
+    
+    while ( error > tol && iter < iter_max )
+    {
+        error = 0.0;
+
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                Anew[j][i] = 0.25 * ( A[j][i+1] + A[j][i-1]
+                                    + A[j-1][i] + A[j+1][i]);
+                error = fmax( error, fabs(Anew[j][i] - A[j][i]));
+            }
+        }
+        
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                A[j][i] = Anew[j][i];    
+            }
+        }
+
+        if(iter % 100 == 0) printf("%5d, %0.6f\n", iter, error);
+        
+        iter++;
+    }
+
+    double runtime = GetTimer();
+ 
+    printf(" total: %f s\n", runtime / 1000);
+
+    return 0;
+}

lab1/C/task1/task1_omp.c

@@ -0,0 +1,70 @@
+#include <math.h>
+#include <string.h>
+#include "timer.h"
+#include <stdio.h>
+
+#define NN 1024
+#define NM 1024
+
+float A[NN][NM];
+float Anew[NN][NM];
+
+int main(int argc, char** argv)
+{
+    int i,j;
+    const int n = NN;
+    const int m = NM;
+    const int iter_max = 1000;
+    
+    const double tol = 1.0e-6;
+    double error     = 1.0;
+    
+    memset(A, 0, n * m * sizeof(float));
+    memset(Anew, 0, n * m * sizeof(float));
+        
+    for (j = 0; j < n; j++)
+    {
+        A[j][0]    = 1.0;
+        Anew[j][0] = 1.0;
+    }
+    
+    printf("Jacobi relaxation Calculation: %d x %d mesh\n", n, m);
+    
+    StartTimer();
+    int iter = 0;
+    
+    while ( error > tol && iter < iter_max )
+    {
+        error = 0.0;
+
+        #pragma omp parallel for shared(m, n, Anew, A)
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                Anew[j][i] = 0.25 * ( A[j][i+1] + A[j][i-1]
+                                    + A[j-1][i] + A[j+1][i]);
+                error = fmax( error, fabs(Anew[j][i] - A[j][i]));
+            }
+        }
+        
+        #pragma omp parallel for shared(m, n, Anew, A)
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                A[j][i] = Anew[j][i];    
+            }
+        }
+
+        if(iter % 100 == 0) printf("%5d, %0.6f\n", iter, error);
+        
+        iter++;
+    }
+
+    double runtime = GetTimer();
+ 
+    printf(" total: %f s\n", runtime / 1000);
+
+    return 0;
+}

lab1/C/task1/task1_simple.c

@@ -0,0 +1,68 @@
+#include <math.h>
+#include <string.h>
+#include "timer.h"
+#include <stdio.h>
+
+#define NN 1024
+#define NM 1024
+
+float A[NN][NM];
+float Anew[NN][NM];
+
+int main(int argc, char** argv)
+{
+    int i,j;
+    const int n = NN;
+    const int m = NM;
+    const int iter_max = 1000;
+    
+    const double tol = 1.0e-6;
+    double error     = 1.0;
+    
+    memset(A, 0, n * m * sizeof(float));
+    memset(Anew, 0, n * m * sizeof(float));
+        
+    for (j = 0; j < n; j++)
+    {
+        A[j][0]    = 1.0;
+        Anew[j][0] = 1.0;
+    }
+    
+    printf("Jacobi relaxation Calculation: %d x %d mesh\n", n, m);
+    
+    StartTimer();
+    int iter = 0;
+    
+    while ( error > tol && iter < iter_max )
+    {
+        error = 0.0;
+
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                Anew[j][i] = 0.25 * ( A[j][i+1] + A[j][i-1]
+                                    + A[j-1][i] + A[j+1][i]);
+                error = fmax( error, fabs(Anew[j][i] - A[j][i]));
+            }
+        }
+        
+        for( j = 1; j < n-1; j++)
+        {
+            for( i = 1; i < m-1; i++ )
+            {
+                A[j][i] = Anew[j][i];    
+            }
+        }
+
+        if(iter % 100 == 0) printf("%5d, %0.6f\n", iter, error);
+        
+        iter++;
+    }
+
+    double runtime = GetTimer();
+ 
+    printf(" total: %f s\n", runtime / 1000);
+
+    return 0;
+}

lab1/C/task1/timer.h

@@ -0,0 +1,67 @@
+/*
+ *  Copyright 2012 NVIDIA Corporation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include <stdlib.h>
+
+#ifdef WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#else
+#include <sys/time.h>
+#endif
+
+#ifdef WIN32
+double PCFreq = 0.0;
+__int64 timerStart = 0;
+#else
+struct timeval timerStart;
+#endif
+
+void StartTimer()
+{
+#ifdef WIN32
+    LARGE_INTEGER li;
+    if(!QueryPerformanceFrequency(&li))
+        printf("QueryPerformanceFrequency failed!\n");
+
+    PCFreq = (double)li.QuadPart/1000.0;
+
+    QueryPerformanceCounter(&li);
+    timerStart = li.QuadPart;
+#else
+    gettimeofday(&timerStart, NULL);
+#endif
+}
+
+// time elapsed in ms
+double GetTimer()
+{
+#ifdef WIN32
+    LARGE_INTEGER li;
+    QueryPerformanceCounter(&li);
+    return (double)(li.QuadPart-timerStart)/PCFreq;
+#else
+    struct timeval timerStop, timerElapsed;
+    gettimeofday(&timerStop, NULL);
+    timersub(&timerStop, &timerStart, &timerElapsed);
+    return timerElapsed.tv_sec*1000.0+timerElapsed.tv_usec/1000.0;
+#endif
+}
+
+#endif // TIMER_H