DZ-Jay wrote:
> On Nov 29, 2007, at 06:10, Wilfried Mestdagh wrote:
>
>> Hello DZ-Jay,
>>
>> So conclusion is that increasing the backlog does:
>> - decrease the performance for accepting connections
>> - decrease the overall performance of the application
>
> This seems to be the conclusion of mine and Huby's tests.
Strange, I never noticed something like that.
>
>> You can exchange data between threads the most easy is by posting a
>> message where a pointer to the data is in WParam argument. The
>> pointer can be freed in the custom message handler.
That's indeed the fastest way since the thread must not wait.
> Perhaps I should run the TWSocketServer on its own thread, and post
> messages from the clients to the queue manager thread to do the work?
> Although this seems too complex and expensive. It almost looks like
> each client should run on its own thread... :(
I'm that sure:
1 - Stressing a server with 100 connection attempts per second is most
likely not a real world scenario, except upon DoS attacks.
2 - Run your stress tester against IIS or other servers, I found that
they were not able to accept more clients per second than my server.
3 - I played with different designs.
a) Listening sockets in one thread, client sockets in another thread(s).
This introduces a new problem, clients are accepted very fast,
however the listening thread must synchronize with the client
thread(s) which may take longer than with current TWSocketServer,
I worked around by posting just the socket handle to the thread
which was fast, however also rather complicated to handle all
the client stuff/pool in the threads.
b) Listening sockets in one thread, one thread per client.
AFAIR without a thread pool accepting clients was slower than
with TWSocketServer.
c) I even hacked together a server that used M$ overlapped sockets,
this was a rather disapointing discourse since performance was
the same as with (a).
The goal is to accept clients as fast as possible, once they are
connected it won't hurt to let them wait some milliseconds.
Before you rewrite your application I suggest you code some test
apps. with different designs and compare their performance.
--
Arno Garrels
>
> dZ.
>
> --
> DZ-Jay [TeamICS]
> http://www.overbyte.be/eng/overbyte/teamics.html
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