Why Loop execution of ActiveX method cause memory usage increase dramatically?

hi,all
I have tried a simple structure as follow:
ActiveX Control is TeeChart Control which is widely used in Delphi
env.
ActiveX Control Ref |------------------------
| |
| ActiveX method |
| |
| |
| |
| i stop->@ |
As the loop execut
ing, memory used by labview increase 4k/second
and several
minute later, it has used up 100M!!
I can confirm that ActiveX Control is Valid cause no problem occure
in VB or Delphi.
I google the web and found that many people have been puzzled by
such problems. Is it a bug in Labview?
Software :
LabView7.0
TeeChart ActiveX Control V5
WinXP
Hardware:
AMD Athlon
256M SDRAM
Any reply be appreciated!

> ActiveX Control is TeeChart Control which is widely used in Delphi
> env.
I like the picture, but couldn't tell if your ActiveX method was
returning other refnum values which it allocated and expected LV to
Close. This is the most likely cause. So, I'd inspect each of the
return values, and if any of them are refnums or are being cast to a
refnum and used as one, be sure it gets Closed. Other things like
arrays should either be converted into LV arrays and released, or if
unwired, they should be released. If you have excluded the problem with
refnums, you might look at the unwired inputs and wire them temporarily
to the edge of a sequence or something just to see if the problem gets
better or worse. Please report anything that you find that
doesn't look
correct.
Greg McKaskle

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Hi, thanks for responding
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Why does this extra REG EVENTS cause memory leak?

LabVIEW 8.6.1f1, Win XP/Vista
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Culverson.com
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Last edited by slate (2010-01-03 22:59:18)

Ultraman wrote:
insanemal wrote:
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[email protected]

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Regards,
Slava Imeshev
"Mathieu Girard" <[email protected]> wrote in message
news:[email protected]..
Hi...
Could anyone tell me what should be the normal memory usage of the server
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thanks!
Mathieu Girard
[email protected]

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Certified LabVIEW Architect
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"... after all, He's not a tame lion..."
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I have a serious time problem that I don't know how to solve because I don't know exactly where it comes from.
I command two RF switches via a DAQ card (NI USB-6008). Only one position at the same time can be selected on each switch. Basically, the VI created for this functionnality (by a co-worker) resets all the DAQ outputs, and then activates the desired ones. It has three inputs, two simp0le string controls, and an array of cluster, which contains the list of all the outputs and some informations to know what is connected (specific to my application).
I use this VI in a complex application, and I get some problems with the execution time, which increased each time I callled the VI, so I made a test VI (TimeTesting.vi) to figure out where the problem came from. In this special VI I record the execution time in a csv file to analyse then with excel.
After several tests, I found that if I run this test VI with the while loop, the execution time increases at each cycle, but if I remove the while loop and use the "Run continuously" funtionnality, the execution time remains the same. In my top level application I have while loops and events, and so the execution time increases too.
Could someone explain me why the execution time increases, and how can I avoid that? I attached my test VI and the necessary subVIs, as well as a picture of a graph which shows the execution time with a while loop and with the "run continuously".
Thanks a lot for your help!
Solved!
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Attachments:
TimeTesting.zip ‏70 KB
Graph.PNG ‏20 KB

jul7290 wrote:
Thank you very much for your help! I added the "Clear task" vi and now it works properly.
If you are still using the RUn Continuously you should stop. That is meant strictly for debugging. In fact, I can't even tell you the last time I ever used it. If you want your code to repeat you should use loops and control the behavior of the code.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

Why Loop execution of ActiveX method cause memory usage increase dramatically?

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