Memory leak with fieldpoint and labview

I have an application which is showing an issue of a memory leak. The application does several things, but the part that seems to be causing the trouble is related to use of Fieldpoint VIs. The application reads individual AI channels on a Fieldpoint AI-110 (10 channels, where the set of channels is measured once per second) I have attached the code related to this. The memory leak is quite large (~1.5GB in 24 hours of operation).
I am using LabView 7.1, and Fieldpoint 4.1. The parent application which uses the attached code is a stand-alone application. The operating system is Windows 2000. Fieldpoint communication occurs over a RS-232 link.
Thanks in advance,
Andy
Attachments:
FPAI100_meas_voltage.vi ‏62 KB

Hi Andy,
I did not see anything fundamentally wrong with what you wrote, but there were
a few things that I think could be used to be changed. However, there
were a few things that I did modify that might make a bit of a
difference. In your application you were using sequences and a bunch of
local variables. Since LabVIEW is based upon data flow, you can control
the sequence of execution by making data dependencies and simply wiring one
thing to the next. By simply using LabVIEW the way it is meant to run I
was able to completely remove the sequence structure and also eliminate the use
of all of the local variables, all while having the exact same execution order.
It could be that the local variables were causing the memory leak that you
noticed, but I really doubt they could be the cause of such a large leak.
I really think there is probably something else going on in the application
because from what I saw from this bit of code there really is no way that it
would have such large problems. Users use the FP commands daily without
any problems, so most likely these are not the root of the problem.
Go ahead and try the modified code and see if you can implement similar local
and global variable reducing techniques throughout your application.
Hopefully that will help reduce some of the memory leaks you are seeing.
Typically the largest cause of an apparent memory leak really occurs from
building an array within a loop, so make sure you don't have any situations
where that occurs in your code either.
Regards,
Otis
Training and Certification
Product Support Engineer
National Instruments
Attachments:
724727-FPAI100_meas_voltage.vi ‏56 KB

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There is no other simple way to find out about who is loosing memory references than by doing debugging by exclusion until the problem disappears. The only way to speed this up, which quite often works for me is doing an educated guess, about what components are most likely to do this misbehaviour.
Not knowing anything about your application and if you are talking about memory hogs (fairly easily identifiable by the mentioned Performance and Memory monitor) or actual memory leaks, it is hard to tell how to go about it. Memory hogs are usually the first thing I suspect escpecially with software I inherit somehow from people from whom I'm not sure they know all the ins and outs of LabVIEW programming.
If a leak seems likely the first culprit usually are custom DLLs (yes even DLLs I have written myself), then NI DLLs such as DAQmx, etc. and last there come leaks in LabVIEW itself. This last category is very seldom but it has happened to me. However before going to scream about LabVIEW having a memory leak you really, really should make sure you have very intensivly researched all the other possibilities. The chance that you run into a memory leak in LabVIEW, while not impossible, is so small compared to the other ways of causing either a memory hog or running into a leak in an external component to LabVIEW, that in 99.9% of the cases where someone screams about a LabVIEW memory leak, he is simply wrong.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

I am using fieldpoint and labview to log and monitor the temperatures of my system. but i am not using Labview 6i with DSC, how can i do it??

i am using fieldpoint 2.0 and labview 6i to monitor my system, but i think i don't have labview DSC.

I have written a relatively large Fieldpoint application "just" using LV5.1 FDS, so it can be done.
Fieldpoint can be seen as an external instrument, so you need to use the driver/vi's that comes with FP.
I believe using DSC would only make the job easier for you.

Memory leak with large files and this code?

Okay, so the following code will not complete.
Basically what I am doing is opening 5 files and generating a PDF document from the already opened Report file, which is renewed prior to the PDF export operation. I left out the general stuff at the start. I am also writing out the location of the PDF to a HTML file, which acts as an index of the exported PDF documents.
I believe it is due to some sort of memory leak issue, but it could be something else or just my code. I have not stepped through this code, but for small file sizes of say less than 40 megs per file, it works fine. For file sizes along these lines:
File 1 = 230 megs
File 2,3 = 26 megs
File 4,5 = 8 megs
it will belch erors at the end of about the 5th iteration through the For loop. It will complete the 5th iteration however. Here are the errors generated:
84   10/26/2006 9:35:15 AM Error:
85   File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p1.TDM" file is invalid.
     (Error no. 6)
86   10/26/2006 9:40:19 AM Error:
87   File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p2.TDM" file is invalid.
     (Error no. 6)
88   10/26/2006 9:45:17 AM Error:
89   File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p3.TDM" file is invalid.
     (Error no. 6)
90   10/26/2006 9:53:07 AM Error:
91   File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p8.TDM" file is invalid.
     (Error no. 6)
92   10/26/2006 10:00:39 AM Error:
93   File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p9.TDM" file is invalid.
     (Error no. 6)
94   10/26/2006 10:01:01 AM Error:Error occured during file creation.
95   10/26/2006 10:01:01 AM Error:
     Error in <GM315 Pa...sing.VBS> (Line: 185, Column: 5):
     File handle for "W:\TR-2051-2100\TR-2060 - BAS Arctic PTC\Vnom\00-99\VnomCombined00-99\p1.TDM" file is invalid.
     (Error no. 6)
For files of a larger size, like:
File 1 = 7500 megs
File 2,3 = 80 megs
File 4,5 = 25 megs
This occurs after about 2-3 iterations through the loop.
see attachment for code.
Attachments:
ForLoopCode.txt ‏11 KB

i am having a similar error randomly inserted in the log
25   10/1/2009 1:58:36 PM Error:
26   File handle for "C:\Program Files\Summitek\Spartan\data\tdm\S Parameter Test $SSN$ 49.TDMS" file is invalid.
     (Error no. 6)
and
31   10/1/2009 1:58:37 PM Error:
32   File handle for "C:\Program Files\Summitek\Spartan\www\temp\Test_$SSN$ 49_602313172.pdf" file is invalid.
     (Error no. 6)
it doesn't seem to be causing an immediate problem, but i have had several unexplained Diadem lockups.
they occur in log after i use CALL DATAFILELOADSEL and CALL PICpdfexport
help? what does this mean
jim

Memory leak with fieldpoint and labview

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