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/* | ||
* Copyright 2013 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. | ||
*/ | ||
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#include <math.h> | ||
#include <string.h> | ||
#include <openacc.h> | ||
#include <stdio.h> | ||
#include "timer.h" | ||
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#define NN 1024 | ||
#define NM 1024 | ||
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double A[NN][NM]; | ||
double Anew[NN][NM]; | ||
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int main(int argc, char** argv) | ||
{ | ||
const int n = NN; | ||
const int m = NM; | ||
const int iter_max = 1000; | ||
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const double tol = 1.0e-6; | ||
double error = 1.0; | ||
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memset(A, 0, n * m * sizeof(double)); | ||
memset(Anew, 0, n * m * sizeof(double)); | ||
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for (int j = 0; j < n; j++) | ||
{ | ||
A[j][0] = 1.0; | ||
Anew[j][0] = 1.0; | ||
} | ||
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printf("Jacobi relaxation Calculation: %d x %d mesh\n", n, m); | ||
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StartTimer(); | ||
int iter = 0; | ||
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#pragma acc data copyin(Anew), copy(A) | ||
while ( error > tol && iter < iter_max ) | ||
{ | ||
error = 0.0; | ||
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#pragma acc kernels | ||
for( int j = 1; j < n-1; j++) | ||
{ | ||
for( int 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])); | ||
} | ||
} | ||
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#pragma acc kernels | ||
for( int j = 1; j < n-1; j++) | ||
{ | ||
for( int i = 1; i < m-1; i++ ) | ||
{ | ||
A[j][i] = Anew[j][i]; | ||
} | ||
} | ||
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if(iter % 100 == 0) printf("%5d, %0.6f\n", iter, error); | ||
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iter++; | ||
} | ||
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double runtime = GetTimer(); | ||
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printf(" total: %f s\n", runtime / 1000); | ||
} |
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/* | ||
* 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. | ||
*/ | ||
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#ifndef TIMER_H | ||
#define TIMER_H | ||
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#include <stdlib.h> | ||
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#ifdef WIN32 | ||
#define WIN32_LEAN_AND_MEAN | ||
#include <windows.h> | ||
#else | ||
#include <sys/time.h> | ||
#endif | ||
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#ifdef WIN32 | ||
double PCFreq = 0.0; | ||
__int64 timerStart = 0; | ||
#else | ||
struct timeval timerStart; | ||
#endif | ||
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void StartTimer() | ||
{ | ||
#ifdef WIN32 | ||
LARGE_INTEGER li; | ||
if(!QueryPerformanceFrequency(&li)) | ||
printf("QueryPerformanceFrequency failed!\n"); | ||
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PCFreq = (double)li.QuadPart/1000.0; | ||
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QueryPerformanceCounter(&li); | ||
timerStart = li.QuadPart; | ||
#else | ||
gettimeofday(&timerStart, NULL); | ||
#endif | ||
} | ||
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// 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 | ||
} | ||
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#endif // TIMER_H |
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