我正在尝试通过此链接https://docs.python.org/3/library/multiprocessing.shared_memory.html
使用python 3.8中的新共享内存示例# In the first Python interactive shell
import numpy as np
a = np.array([1,1,2,3,5,8]) # Start with an existing NumPy array
from multiprocessing import shared_memory
shm = shared_memory.SharedMemory(create=True,size=a.nbytes)
# Now create a NumPy array backed by shared memory
b = np.ndarray(a.shape,dtype=a.dtype,buffer=shm.buf)
b[:] = a[:] # Copy the original data into shared memory
shname = shm.name # We did not specify a name so one was chosen for us
print(shname)
print(a)
print(b)
# In either the same shell or a new Python shell on the same machine
import numpy as np
from multiprocessing import shared_memory
# Attach to the existing shared memory block
existing_shm = shared_memory.SharedMemory(name=shname)
# Note that a.shape is (6,) and a.dtype is np.int64 in this example
c = np.ndarray((6,),dtype=np.int64,buffer=existing_shm.buf)
print(c)
c[-1] = 888
print(c)
# Back in the first Python interactive shell,b reflects this change
# Clean up from within the second Python shell
del c # Unnecessary; merely emphasizing the array is no longer used
existing_shm.close()
# Clean up from within the first Python shell
del b # Unnecessary; merely emphasizing the array is no longer used
shm.close()
shm.unlink() # Free and release the shared memory block at the very end
在示例中,c
的输出应为array([1,8])
,但是运行此命令时,我得到:
wnsm_26020d1b
[1 1 2 3 5 8]
[1 1 2 3 5 8]
[ 4294967297 12884901890 34359738373 0 0 0]
[ 4294967297 12884901890 34359738373 0 0 888]
我完全错过了什么吗?其他人有这个结果吗?