Looking for performance

FROM : kubernan
DATE : Thu Oct 31 21:58:46 2002

Hello,

I'm in tests with my client/server application.
I have a big problem of low performance with the GUI that sends
requests to the server using DO.

The design is :

1- Client GUI --> sends request using DO to the server. There is a
sync. response if the request contains errors.
2- While the server is working on the client request (in a thread) it
sends real time information to the client.

The performance problem is :
3- If the client sends a wrong request WHILE the first request is
always in work in the server (in a thread), the sync. response returns
after a long time.

In detailed :

The GUI sends a request to the server. The server runs this request
in detached thread.
If a client request is wrong, the server returns synchronously a
NSMutableArray that
describes the error of the client request. If all is ok, then the
server thread is launched.
Exemple of client request :

NSMutableDictionary *errors = [NSMutableDictionary
dictionaryWithDictionary:[serverProxy doThat:aDict]];
if ([errors count] > 0) // if the call returns errors
{
    NSEnumerator *enumerator;
    id key;
    enumerator = [errors keyEnumerator];
    while (key = [enumerator nextObject]) // read all errors in the
returned dictionary
    {
        int return_code;
        return_code = NSRunAlertPanel(@"GUI Stress Test", [errors
objectForKey:key], @"Ok",nil,nil);
      }
}
else
    [informationText setStringValue:@"The server is working on your
request"];


While the server thread is working it sends informations to the client
that
updates its GUI with these informations. Using (in the server) :
[(NSDistantObject *)clientProxy setProtocolForProxy:
@protocol(clientProtocol)];
// blabla
[tempProxy serverToClientInformation:aMutableDictOfInformation];

The big performance problem is coming when i try to launch
a new request (simulating a wrong request) to the server even if the
first one is always
up. The GUI is waiting for the synchronous server response, and it comes
after a long time; about one minute !
Following the server and client code in the debugger i can't see where
there is a lock.
The response seems disappear somewhere between the server and the
client.

I tried to add some locks in my code, i tried to avoid the synchronous
reply from the server
but there is always the same problem.

Can you help me ?
Thx.
K.
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