[jacorb-developer] Delay in serial communication

[Kujtim Hyseni]

On date 29 March 2012 I posted the following message at JacORB mailing list:

"Hello,

for my project I heave developed a class (implementation class) which forwards requests (operations) from client to serial port, waits for response, receives the response and sends it back to client but it takes a long time to perform it. It delays in receiving the response from serial port. For communication with serial port I have developed a dedicated class which implements Runnable and SerialPortEventListener classes. My class communicates serially with 8051 microcontroller. Again, it seems that class delays in receiving the byte stream from microcontroller. Microcontroller has a built in serial port while my PC uses USB-to-Serial cable. When I communicate microcontroller with the class from usual Java program (from main() routine) it works fine and it takes less than a second to receive the response back.

I did some measurements (100 requests) in two ways. In the first, communication class is external and is instantiated from implementation class. In the second, communication class is merged with implementation class. The results are: for first way average response time 9.33266 seconds, minimal response time 4.984 seconds while maximal response time 18.015 seconds; for second way average response time 8.62625 seconds, minimal response time 4.969 seconds while maximal response time 16.015 seconds. These values are unacceptable for real time applications and raise the question for using JacORB further.


What do you think and suggest about?"

Then I got various suggestions (from Nick Cross) such: to install JacORB 3.0 and provide the code samples.

I now installed JacORB 3.0 and made the same tests, but, received the same delays - just to illustrate for 5 requests times are (in seconds): 6.735, 12, 8, 7 and 13. When I invoke the requests from usual java program it takes less than a second per request - this is normal since routines at this phase are void , they just return values.

Again, these delays are unacceptable for out application and if not resolved we will abandon JacORB and move to another ORB or perhaps Web service technology.

Can someone from JacORB developers or mailing list contributors pay some attention and help resolving this issue, in order to continue with my project and use JacORB.

Kujtim Hyseni