Use loop - unpredictable queue rate

Hi all

I develop the structure of producer-consumer on RT, and I have a strange problem. I get data from the FPGA producer loop and send queue loop of consumer. Then they must cross flow network host. Due to the fact that consumers stay at the producer (queue overflowed), I started to slow down producer (the cost of this action sends more data). It did not help, so I added the structure of the case to the producer to send data to just half of the queue (those to TRUE in the shift register).

This is the moment where I realized that sometimes closing LabVIEW environment and opening it again the effects to accelerate the transmission of the queue. Then I can even speed loop producer and my queue is not overflowing! And I can stop and run my program and it still works well.

I finish by closing and opening of LabVIEW and run my entire program again wait that it 'click', because when he finally arrived, I have no problem until the next session of LabVIEW.

Someone has an idea of what I could do wrong? Or how could I solve this problem?

Dear Owca

I see no problem in the code that you sent, and the speed with which you work are relatively low, too. This brings me to assume that the other parts of the code can be causig the problem you are experiencing. Let me make some suggestions:

  • Check the CPU usage when the VI is running. Because the consumer is runing at normal priority (as it should), other priority tasks could starve it.
  • Is the amount of data about in a table? Another good test is to monitor the memory usage to see if fragmentation is causing a disorder.
  • Using a queue of fix size? If this isn't the case, I recommend to avoid dynamic memory allocations.

Disabling debugging features allows a little. Please get back to me if you have results.

Kind regards:

Andrew Valko

NOR Hungary

Tags: NI Software

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