Dear steve,

I had a query regarding using multiple socket connections to IQConnect. We have a requirement of getting realtime data (level 1) for around 100 symbols at the same time. The application is developed in Java. I have a confusion regarding this. Should i use a single Socket connection and give commands for all the 100 symbols, OR should i used different Socket connections at the same time for each symbols. Secondly, we have to use threads to read data from socket, but here also should I use a single thread with a single socket connection for all 100 symbols, OR should i create individual threads (and individual socket connection) for each symbol. Please could u help me in this. How would it affect the performance if we use multiple threads (or socket connections).

Eagery awaiting for some good reply...


Vishwanath

A lot of threads will decrease your performance because there would be some CPU time to switch between them. The good practice is to have one thread per one CPU.

I have desktop application which has 2 threads: main (GUI - request data and watch results) and background one which listens the socket and sends data to the UI. It updates ~700 symbols using single socket and works fine for me.

With IQFeed, you can create up to 20 local level 1 socket connections at any given time. However, there should be no need to do this unless you have a need to keep certain data compeltely separate in your app. IQFeed makes a single socket conenction to the server for level 1 data.

Concerning threads, as dis said, this depends upon the number of CPU's and/or the number of simultaneous threads your computer can execute at one time (usually equal to the number of CPU's that windows reports). You will see that exceding this number by more than a few threads will actually significantly decrease the performance of your app.
Edited by DTN_Steve_S on Jun 27, 2007 at 08:32 AM