56 lines
1.6 KiB
Plaintext
56 lines
1.6 KiB
Plaintext
#include <cstdio>
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#include "integral.h"
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#define CHECK_CUDA(call) \
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do { \
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cudaError_t status_ = call; \
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if (status_ != cudaSuccess) { \
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fprintf(stderr, "CUDA error (%s:%d): %s:%s\n", __FILE__, __LINE__, \
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cudaGetErrorName(status_), cudaGetErrorString(status_)); \
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exit(EXIT_FAILURE); \
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} \
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} while (0)
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// Device(GPU) pointers
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static double *pi_gpu;
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static double f(double x) { return 4.0 / (1 + x * x); }
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double integral_naive(size_t num_intervals) {
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double dx, sum;
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dx = (1.0 / (double) num_intervals);
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sum = 0.0f;
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for (size_t i = 0; i < num_intervals; i++) { sum += f(i * dx) * dx; }
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return sum;
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}
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double integral(size_t num_intervals) {
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double pi_value = 0.0;
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// Remove this line after you complete the matmul on GPU
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pi_value = integral_naive(num_intervals);
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// (TODO) Launch kernel on a GPU
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// (TODO) Download pi_value from GPU
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// DO NOT REMOVE; NEED FOR TIME MEASURE
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CHECK_CUDA(cudaDeviceSynchronize());
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return pi_value;
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}
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void integral_init() {
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// (TODO) Allocate device memory
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// DO NOT REMOVE; NEED FOR TIME MEASURE
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CHECK_CUDA(cudaDeviceSynchronize());
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}
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void integral_finalize() {
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// (TODO) Free device memory
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// DO NOT REMOVE; NEED FOR TIME MEASURE
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CHECK_CUDA(cudaDeviceSynchronize());
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}
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