Re: [libmicrohttpd] Problem with Keep-Alive and MHD_OPTION_CONNECTION_TIMEOUT in MHD_USE_THREAD_PER_CONNECTION mode

[silvioprog]

On Mon, Dec 7, 2015 at 5:27 PM, Christian Grothoff <address@hidden> wrote:

[...]
Well, on Linux C10k is easy these days. We had people using MHD that in
practice had what you might call the C100k problem, and that was doable ;-).

Very good! Currently I'm using it only as embedded server providing invoices from some supermarket checkouts, but I have plan to use MHD on Linux as webserver instead of NodeJS. :-)

Well, thread-per-connection was never the most scalable option,
especially if used like this...

Yes, you are right, it was just a test hehe.

If you really need to hit MHD with thousands of parallel requests, you
may want to consider using the thread *pool* (set the thread pool size).

I want to use the more stable and fast Win32 option of MHD. The time of my requests are very short, because it handles only some strings as JSON or XML (about 500B ~ 2KB), so I belieave that I can to use select() instead of thread-pool. But these errors scares me a little, because my app can't fail in production (the Brazilian laws is terrible, a non sent invoice can result in a catastrophic penalty :-( ).

 

Not necessarily.  Using thread-per-connection will use way more RAM, but
fewer expensive system calls.  So until you hit your memory limit or run
into scheduler problems, thread-per-connection can be more scalable,
especially on W32 where the current 'select()'-mechanism is rather
awkward AFAIK.

But even on GNU/Linux thread-per-connection can be faster as long as
your system can handle all the threads (and doesn't encounter trouble
with cache misses for all the stacks).

NodeJS is very fast and stable on Windows (I believe that `libuv` -- the NodeJS heart -- uses IOCP), but I prefer to use MHD, because I can use it as embedded server in my own application. I need to confirm if libuv uses IOCP, if so, that's the secret, if not, IMHO MHD should take a look at the NodeJS (or nginx, libevent etc) logic to undestand why it is so fast and stable on Windows.

--

Silvio Clécio