timeout

nsns

Hi,

could I ask to clarify how timeouts work.
I wrote a small test in which the client calls a server method (Linux, gcc 3.2.3).
On the client side (implemented via Ice::Application) I set up the timeout of 2 sec.
The server method contains 'sleep(20)' to sleep 20 sec.
When I run the client I do get the Ice::TimeoutException in 2 sec but
after this the program hangs up and doesn't respond even on Ctrl-C during
remaining 18 sec. Is it intended behaviour ?
How can I force the client to exit ?

Thanks, Nikolai

marc

Try increasing the number of threads in the server side thread pool (e.g., Ice.Server.ThreadPool.Size=2). By default, it's just one thread, and in your case, this thread hangs in the 20-seconds sleep, so no other thread is available to react to the close connection message from the client.

You can also forcefully kill the client with ctrl-c, but then you cannot use the Application helper class. The Application helper class does a graceful shutdown upon ctrl-c, meaning that it will wait until the server reacts to the connection closure request.

nsns

Hi Marc,

thanks, your advice to increase the server side thread pool helped.
Although not exactly as you recommended.
My server is implemented as Ice::Service and when I set 'Ice.ThreadPool.Server.Size=2'
('Ice.Server.ThreadPool.Size' was a mistyping)
I got the flollowing message:

warning: thread pool 'Ice.ThreadPool.Server' is running low on threads
Size=2, SizeMax=2, SizeWarn=1

So, I decided that Ice::Service already runs more than one thread and increased
Ice.ThreadPool.Server.Size significantly. It helped.

Two more questions:
1. What is the default number of threads for Ice::Service ?
2. What's the meaning of the parameters returned in the above warning message ?
In particular, how 'SizeWarn' is calculated ?
This parameter is important for me because I can estimate the load of my server and want to set
a reasonable value to SizeWarn, but I can do it for 'SizeMax' only.

Cheers, Nikolai

marc

Please have a look at the Ice manual, chapter "C.6 Ice Thread Pool Properties". This should answer all your questions about thread pool properties.

nsns

Sorry, Marc, just before getting the reply from you I found the answer on my second question
in the Manual.
Thanks, Nikolai