Re : Significant Decrease in Performance using NI-488.2 for Windows and LabVIEW Real-Time

[Manooch_H]

Users can experience significant loss of GPIB performance after installing or updating NI software on systems using the following GPIB interface types:

• PCI
• PCI Express
• PMC
• PXI
• Built-in interfaces on PXI and VXI controllers 

All other GPIB interfaces are not affected.

This may result in a performance decrease in the execution of TestStand test systems that use the above mentioned GPIB interface types. Please visit the KnowledgeBase Article linked below for more information and updates regarding this issue.

Significant Decrease in Performance using NI-488.2 for Windows and LabVIEW Real-Time

[lordsathish]

Is it possible to use TestStand with Real Time systems ?

[Manooch_H]

Yes it is. For more information please see Chapter 8 of the Using LabVIEW and LabWindows/CVI with TestStand manual. If you have further questions please create a new forum thread and keep responses to this thread directed to the NI-488.2 Performance Issue.

Thank you.

[Thez]

Hi,

I encounter a significant loss of Gpib performance, for one year now !

I have written a Gpib application (in C++) which works fine since we use

Visual C++ 2005 Express Edition and its compiler.

Now, each client that uses my Gpib application consumes a lot of CPU

something in the range 5% up to 15% (if polled).

I took a look here :

http://digital.ni.com/public.nsf/allkb/DD67839852DCF8FA8625768D007A8474

and tried to update the ni4882 driver found here :

http://joule.ni.com/nidu/cds/view/p/id/1529/lang/en

But, I have no success. I do not know where is the problem and why

that consume a lot of CPU.

My configuration :

- Windows 2000 SP4 on a CompactPCICrate

- Ni-488.2 v2.2.73

- Gpib board for CompactPCICrate

- Visual C++ 2005 Express Edition

Any help should be appreciate.

Best Regards

Xavier 

PS : I also tried a simple main which call first ibdev and

then enter an infinite loop which call ibwrt (sending "*IDN?") and ibrd.

This consumes 10% of the CPU !! 

[Manooch_H]

Xavier -

I can imagine this being rather frustrating for you. Might I advise that you post this issue to the Instrument Control (GPIB, Serial, VISA, IVI) forums to receive assistance there? As your issue doesn't seem to involve TestStand at all, I think you would receive better assistance there.

Hope this helps.

[Thez]

Manooch,

Sorry, I have seen Performance and Windows but not TestStand !!

Thank you for your answer and have a nice evening.

Xavier