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On 06/30/2014 04:13 PM, [email protected] wrote:
> I am 100% in favor of switching to asynchronous read instead of
> read_start. However I think you want to stick with alloc_cb unless
> you can think of something better.
>
> Imagine you have 10k open tcp connections that all *may* receive
> data. Then you are pre-allocating 64k * 10k = 640mb of buffers
> alone, which are almost never used. With alloc_cb, libuv can ask
> the embedder to allocate memory as late as possible. For TCP
> handles buffers can be allocated very much "last minute", while for
> operations that happen in the thread pool the buffer can be
> allocated upfront.
>
Ah, you are so right! I proposed this update on another email:
UV_EXTERN int uv_read(uv_read_t* req,
uv_stream_t* handle,
uv_alloc_cb alloc_cb,
uv_read_cb read_cb);
This would actually make it more flexible, I think: those who want to
allocate it upfront can embed the req in another structure and attach
their preallocated buffers there and then use them in alloc_cb.
PS: I need to give this 2nd version a bit more thought, I wrote it
while multitasking so I might be missing something.
- --
Saúl Ibarra Corretgé
bettercallsaghul.com
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