Re: [naviserver-devel] Writer Thread proposal

[Gustaf N. <ne...@wu...>]

Vlad Seryakov wrote:
>
> Hi,
>
> I have another idea for you to check:
>
> Will it be usefull to have special writer thread that will send 
> multiple files in async mode to multiple clients. For example if i 
> serve big ISO or movie files and have many connections, currently they 
> all use conn thread for along time until the whole file is sent.
> Instead we can mark the conn to be used in writer thread and release 
> conn thread for other requests and in the meantime the writer thread 
> will send multiple FDs to clients in one big loop.
this is exactly what we are doing in our production system, and what the 
code posted in

   http://sourceforge.net/mailarchive/message.php?msg_id=14351395

does. With the recent change in naviserver, that zoran put in, this code 
runs without a patch in
naviserver (provided you have the tclthread library and the 
xotcl-support from aocs/packages/xotcl-core
installed).

the recent discussion was however, to generalize this further and use 
such thread for
sending and receiving, thus the proposed name "spooling-thread".

-gustaf
>
> Currently it is possible to simply change ConnSend in connio.c to 
> submit open descriptor to the writer queue and return marking the 
> connection so  usual NsClose will not close actual connection socket. 
> Then write thread will be simple loop reading small chunks from every 
> file and sending to corresponding socket.
>
> Does it make sense?
>