Consumer/producer fast AI and AO.

I made a routine for fast DAQmx (PXIe-6124) acquisition in two while loop (consumer and producer).
Currently it can be run by pushing run-button.
But, I would like to one more while loop (totally 3) for user-friendly interface and integrating sub-program using event structure.
Among troubles I thought, these three loops can affect the acquisition speed of DAQmx.
For example, if I send a "Acquire" signal to producer and consumer of DAQmx from event loop,
this mean I also have to send "Stop" command.
This requires more functions in every real-time acquisition iteration.
-conditional state loop and cluster bundle of 2D(500*500 DBL array) and variant of command enum or data to control consumer loop in producer of DAQmx.
-conditional state loop for next step and cluster unbundle of data in consumer loop.
My question is...
Are there some special or rule-of-thumb techniques for continuous, fast and large data DAQmx acquisition in producer and consumer using three while loops?
Instead of this, do I had better use call-by-reference under other main program?
labmaster.
*)I am sorry I can't post my code because of modifying and hidden subVIs.

You will need some logic in your producer loop to execute the stop command sent by the first while loop but won't need one for the consumer loop since it can stop on error when the producer loop is stopped and the queue you are reading from is destroyed.
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

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Hi,
I have to acquire 32 signals and record each signals. I would like to acquire my signals at a sample rate of 100kHz. But I tried with a different sample read and I have always an error of overwritten.
In my producer loop I read and display all signals and in my consumer loop I record and resample my signal.
But I thought It was maybe I haven t a timing loop in my producer and consumer loop and it slow my read in the buffer.
So do you think my error due to I haven t timing loop? And if it s yes, where do I put my timing ? in the consumer or in the producer loop.
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Is it a proper way to use queue for consumer/producer model?

Hi all,
I am following the example of consumer/producer model to use the queue to synchronize the following process: The producer is a loop to produce N numbers, I will put every generated number into an array and after every 5 numbers generated, I put the array into the queue and pass it to the consumer. I have to wait the consumer use up the data and it will then remove the element from queue so the producer will get a chance to produce another 5 numbers. Since I set the maximum size of the queue to be ONE, I expect the producer and consumer take turns to produce / consume all five numbers and pass the chance to the other. Here is my code
when the case box is false, the code will be
For the first 5 numbers, the produce will generate every thing right and put that into the array, and it will pass the array to the quere so the consumer will get a chance to loop over the array. I except the procude's loop will continue only when the queue is available (i.e. all elements are removed), but it seems that once the consumer start the loop the produce 's loop will continue (so the indicator x+1 and x+2 will show numbers changed). But it is not what I want, I know there must be something wrong but I can't tell what is it.
Solved!
Go to Solution.

dragondriver wrote:
As you said in 1, the sequency structure enforcing the execution order, that's why I put it there, in this example, to put the issue simple, I replace the complete code with number increase, in the real case, the first +1 and +2 must be executed in that order.
Mikeporter mentioned:
1. Get rid of all the sequence structures. None of them are doing anything but enforcing an execution order that would be the same without them.
So even if you remove the sequence structure, there will be a fixed & defined execution order and that is because LabVIEW follows DATA FLOW MODEL.
Data Flow Model (specifically in context of LabVIEW): A block diagram node executes when it receives all required inputs. When a node executes, it produces output data and passes the data to the next node in the dataflow path. The movement of data through the nodes determines the execution order of the VIs and functions on the block diagram (Click here for reference).
Now in your code, just removing the sequence structure will not make sure that the execution order will gonna remain same but you need to do few very small modifications (like pass the error wire through For loop, before it goes to 'Dequeue Element' node).
Coming to the main topic: is it a proper way to use queue for consumer/producer model?
The model you're using (and calling it as consumer/producer model) is way too deviated from the original consumer/producer model model.
dragondriver wrote:
For the second one, yes, it is my fault to remove that while. I actually start from the example of Producer/Consumer design pattern template, but I didn't pay attention to the while loop in the consumer part.
While loops (both Producer & Consumer) are the essential part of this architecture and can't be removed. You may want to start your code again using standard template.
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