The problem of libuv is that it does not call the completion callback right after write succeeds. Instead, it is only until all I/Os are performed that the callbacks are called. This means that if you have 1,000 connections sending 64KB of data, your code first allocates 64KB of memory 1000 times (64MB in total) and then call freefor all of those memory chunks, even when the network operation does not block. IMO, libuv should better call the completion callback immediately after the application returns the control back to the library after calling uv_write, so that the memory allocation pattern could be a repetition of malloc-and-then-free for 1000 times. (from http://blog.kazuhooku.com/2014/09/the-reasons-why-i-stopped-using-libuv.html )
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