10.10.21 19:05, Patrick Reader пише:
> This still isn't a completely direct write - you're still creating an array
> in between which is then copied into shm, whereas struct.pack_into writes
> directly into the shared memory with no intermediate buffer.
>
> And unfortunately you can't do
>
> shm.buf[l_offset:r_offset].cast('Q')[:] = nums
>
> where nums is a plain Python iterable; it has to already be an array, so it
> still requires a copy.
Yes, I tried this too. Maybe we will add a support of arbitrary
iterables. There may be problems with this because we don't know the
length of the iterable and can't guarantee that all items are
convertible without converting them and saving results in a temporary array.
If you do not want to spend additional memory, iterate nums and set
items one by one. Or iterate and set them by chunks
target = shm.buf[l_offset:r_offset].cast('Q')
for i in range(0, len(nums), chunksize):
j = min(i + chunksize, len(nums))
target[i:j] = array.array('Q', nums[i:j])
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