display lag

[Mannkind]

Has anyone had display problems i.e. lag time, with running Labview applications on the Dell inspiron 910 or Asus Eee PC 900?

[tinnitus]

hello mannking,

could you be more explicite :

do you mean in dev mode , runtime mode, do you have a vi wich highlight problem you encountered ?

best regards

Tinnitus

[Anna_K.]

Hello Mannkind,

We haven't had reports of anyone having issues running LabVIEW on the machines you mentioned. Could you tell us a little more about the circumstances of this behavior?

- What is being displayed? Are you updating values on the Front Panel?

- Are you running a LabVIEW application on the same machine it was developed on?

- Could you give a description of what the code does?

Thanks,

Anna K.

[Con]

Hi,

I thought i start up this post again because it sounds very similar to the problem we are having at the moment.

We are using Labview 2009 SP1 as development system.

Equipment being used is the PXI 8108 inside a PXI 1042 chassis with at PXI 6521 and 8433/4. A hp desktop computer has Labview 2009 Runtime to accomdate user interface software.

The 8108 is running Labview 2009 RT.

Software is running on the 8108 is publishing data via labview shared variables for the user interface which runs on the hp desktop. The HP computer and 8108 are linked up on the network via netgear network switch. They have also been connected directly to eachother via crossover cable where the problem is still evident.

We have noticed that there is a "time lag" issue where network shared variable data that is being displayed on the user interface does not reflect the data which can be seen via distributed system manager. That is, the data being displayed on the user interface is not up to date to what the main software on the 8108 is publishing. When the user interface software is first started, there is no evidence of time lag. But as time progresses the user interface will fall behind and the time lag will increase. It has been seen after half an hour there could be a time lag of up to 5 minutes. Then if you close the user interface software and then open it again it will be up to date but then slowly fall behind again.

The user interface software is a build and not running in development mode.

Has anybody seen similar symptoms and if so, have any ideas to what could be causing the problem? If more information is required please ask.

Thanks

Conrad

[Patricia B]

Hello,

What kind of data and how much data are you storing in shared variables? There are a number of methods to pass data from PC to RT target. Depending upon the type and amount of data within your application, you may want to consider a different method such as network streams. You may see better performance using network streams as shared variables are convenient but least efficient.Below are two articles that may help you compare the two options for your application.

Lossless Communication with Network Streams: Components, Architecture, and Performance

Using the LabVIEW Shared Variable

Hope this helps. Best,