Best way to troubleshoot slow VI.

[Orion HE]

I have a VI that is displaying data from a PLC.  I am using an OPC server, set to update every 50ms.  My VI updates the indicators on the screen every 11-15 seconds.  I have event structures, but they are all timing out at 50ms, and there are no wait functions in my loop (I had decided to let the timouts of the event structures be my minimum).  I was wondering what the best way to see where my bottleneck in the VI is.

[MattBradley]

Any chance you could post your code?  How many event structures do you have? (That could be the problem)  You probably only need one.

[Orion HE]

I have around twenty.  What is the best way to post code?  It's quite large and pretty messy, I doubt you want to see it.

[Orion HE]

Ok, it appears to be my opc server that is actually refreshing that slow.  I guess I need to post this in the dsc area.

[Orion HE]

I guess there isn't a specific DSC area, and when I search for slow OPC server, my thread is top post.  Uh oh.

[MattBradley]

Even if you have a slow OPC server, I don't see why you would need 20 Event structures.  An Event structure can handle more than one event.  As for posting your code, there is an "Add Attachments" link when you post a message (near the bottom, under the Tags box).

[Cory_K]

I dont think there will every be a point in time when you will need 20 event structures!

You can just right click on one, and keep adding events, so you arent using up all the computers resources polling for events.

[Orion HE]

Here is my multi event VI, if the upload works.  I have created an HMI that needs to read and write from a PLC so as not to interfere with the existing HMI.  The event structures first read the data in the PLC and write a new value only when it has been changed by a control object in LabVIEW.  I could have twenty events within a structure, but it would have so many wires coming out of it (the addresses to my shared variables) it would be just as ugly.

[Orion HE]

Oh no!! all of my computer's resources are used up polling for events!!!

[Cory_K]

Thanks for the sarcasm, but before you make comments, try running the code with only 1 event structure.

Some programmers try to make code efficient as well as functional

Message Edited by Cory K on 08-11-2009 05:54 PM