PyCUDA help explains how to create an empty or zeroed array但不是如何將(?)現有的numpy數組移動到頁鎖定的內存中。我是否需要獲取numpy數組的指針並將其傳遞給pycuda.driver.PagelockedHostAllocation
?我該怎麼做?如何在PyCUDA中從現有的numpy數組創建頁面鎖定的內存?
UPDATE
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更新2
感謝talonmies您的幫助。現在內存transfare是頁面鎖定,但該方案具有以下錯誤結束:
PyCUDA WARNING: a clean-up operation failed (dead context maybe?)
cuMemFreeHost failed: invalid context
這是更新的代碼:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import numpy as np
import ctypes
from pycuda import driver, compiler, gpuarray
from pycuda.tools import PageLockedMemoryPool
import pycuda.autoinit
memorypool = PageLockedMemoryPool()
indata = np.random.randn(5).astype(np.float32)
outdata = gpuarray.zeros(5, dtype=np.float32)
pinnedinput = memorypool.allocate(indata.shape,np.float32)
source = indata.ctypes.data_as(ctypes.POINTER(ctypes.c_float))
dest = pinnedinput.ctypes.data_as(ctypes.POINTER(ctypes.c_float))
sz = indata.size * ctypes.sizeof(ctypes.c_float)
ctypes.memmove(dest,source,sz)
kernel_code = """
__global__ void kernel(float *indata, float *outdata) {
int globalid = blockIdx.x * blockDim.x + threadIdx.x ;
outdata[globalid] = indata[globalid]+1.0f;
}
"""
mod = compiler.SourceModule(kernel_code)
kernel = mod.get_function("kernel")
kernel(
driver.In(pinnedinput), outdata,
grid = (5,1),
block = (1, 1, 1),
)
print indata
print outdata.get()
memorypool.free_held()