Performance issues interfacing dlls with Labvies

[markstewart]

Hi

I'm attempting to interface some custom dlls with a LabView program written by a coworker and I am experiencing some fairly dramatic performance penalties. The performance hits is intermitant, but very annoying.

I've had several programmers look over the C++ code used to generate the dll, so I'm confident that the problem is not in the dll. Any hints on where to start tracking down this problem, and how to fix it.

Thanks

Mark

[tst]

I don't think I will be able to help with your specific problem, but I suggest you provide more details about what it is you're trying to do and what you mean exactly by intermittent performance penalties.
Posting your code and the DLL is probably also a good idea.

[Wiebe@CARYA]

Hi,


You can try to change the execution mode of the external code. Right click>Configure "Run in UI thread" or "Reentrant". It doesn't work with all external code, but if it works, it will run faster. If the dll stores values in it's own memory it will not work.


Regards,


Wiebe.



"markstewart" <x@no.email> wrote in message news:211293@exchange.ni.com...
Hi<br><br>I'm attempting to interface some custom dlls with a LabView program written by a coworker and I am experiencing some fairly dramatic performance penalties. The performance hits is intermitant, but very annoying.<br><br>I've had several programmers look over the C++ code used to generate the dll, so I'm confident that the problem is not in the dll. Any hints on where to start tracking down this problem, and how to fix it.<br><br>Thanks<br><br>Mark

[markstewart]

We finally got to the bottom of this one and it turns out to have nothing to do with Labview.

There was a very subtle error buried deep within one of our libraries, caused by conditional compilation.

Thanks for those who have responded.

Mark