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December 11, 2015 10:17
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PyOpenCL example
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| import numpy as np | |
| import pyopencl as cl | |
| N = 1000000 | |
| a_np = np.random.rand(N).astype(np.float32) | |
| b_np = np.random.rand(N).astype(np.float32) | |
| ctx = cl.create_some_context(answers=['0']) | |
| queue = cl.CommandQueue(ctx) | |
| mf = cl.mem_flags | |
| a_g = cl.Buffer(ctx, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=a_np) | |
| b_g = cl.Buffer(ctx, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=b_np) | |
| prg = cl.Program(ctx, """ | |
| __kernel void sum(__global const float *a_g, __global const float *b_g, __global float *res_g) { | |
| int gid = get_global_id(0); | |
| res_g[gid] = a_g[gid] + b_g[gid]; | |
| } | |
| """).build() | |
| res_g = cl.Buffer(ctx, mf.WRITE_ONLY, a_np.nbytes) | |
| prg.sum(queue, a_np.shape, None, a_g, b_g, res_g) | |
| res_np = np.empty_like(a_np) | |
| cl.enqueue_copy(queue, res_np, res_g) | |
| print(res_np - (a_np + b_np)) | |
| print(np.linalg.norm(res_np - (a_np + b_np))) |
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