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90 lines
2.2 KiB
Python
90 lines
2.2 KiB
Python
4 years ago
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from time import time
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import pycuda.autoinit
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import pycuda.driver as drv
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import numpy as np
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from pycuda import gpuarray
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from pycuda.compiler import SourceModule
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ker = SourceModule("""
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__global__ void
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check_prime(unsigned long long *input, bool *output)
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{
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int i = threadIdx.x + blockDim.x * blockIdx.x;
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unsigned long long num = input[i];
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if (num == 2) {
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output[i] = true;
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return;
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} else if (num < 3 || num % 2 == 0) {
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return;
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}
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unsigned long long limit = (long) sqrt((double) num) + 1;
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for (unsigned long long i = 3; i <= limit; i += 2) {
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if (num % i == 0) {
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return;
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}
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}
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output[i] = true;
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}
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""")
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ker2 = SourceModule("""
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__global__ void check_prime2(const unsigned long *IN, bool *OUT) {
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int id = threadIdx.x + blockDim.x * blockIdx.x;
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unsigned long num = IN[id];
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unsigned long limit = (unsigned long) sqrt((double) num) + 1;
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if (num == 2 || num == 3) {
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OUT[id] = true;
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return;
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} else if (num == 1 || num % 2 == 0) {
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return;
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}
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if (limit < 9) {
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for (unsigned long i = 3; i <= limit; i++) {
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if (num % i == 0) {
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return;
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}
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}
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} else {
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if (num > 3 && num % 3 == 0) {
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return;
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}
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for (unsigned long i = 9; i <= (limit + 6); i += 6) {
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if (num % (i - 2) == 0 || num % (i - 4) == 0) {
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return;
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}
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}
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}
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OUT[id] = true;
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}
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""")
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block_size = 1024
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grid_size = 50000
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check_prime = ker2.get_function("check_prime2")
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testvec = np.arange(1, block_size * grid_size * 2, step=2).astype(np.uint)
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testvec_gpu = gpuarray.to_gpu(testvec)
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outvec_gpu = gpuarray.to_gpu(np.full(block_size * grid_size, False, dtype=bool))
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t1 = time()
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check_prime(testvec_gpu, outvec_gpu, block=(block_size, 1, 1), grid=(grid_size, 1, 1))
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result = outvec_gpu.get()
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t2 = time()
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primes = []
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for idx, val in enumerate(result):
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if val:
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primes.append(idx)
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#print(primes)
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print(len(primes))
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print('checked the first ' + str(block_size * grid_size) + ' numbers')
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print('last prime: ' + str(primes[-1]))
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print('The GPU needed ' + str(t2 - t1) + ' seconds')
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