How can i detect "Memory leak" with large LabVIEW projects.

Hi,
I have a huge LabVIEW application that runs out of memory after running continuously for some time. I am not able to find out the VI that is hogging up memory. Is there any tool that dynamically detects the VI that is leaking memory.
Or, is there a tool or a way to identify the critical areas which can be potential culprits that is leaking memory.
Regards
Bharath

Bdev wrote:
Thanks Dennis.
I think Desktop Execution toolkit should solve the problem.
Wayne Wrote
Have you tried Tools»Profile»Performance and Memory ? http://zone.ni.com/reference/en-XX/help/371361F-01/lvdialog/profile/
But this will just give me the amount of memory used by the VIs and not the amount of memory that is not getting released.
And where is the problem about that? Just try to find what VIs keep increasing in memory size. That are the culprits. If you have real memory leaks, meaning there is memory that is not managed by LabVIEW directly but for instance by a DLL somewhere and that DLL looses references to memory, so it goes really lost, then the only way to find that is by successively exclude functionality in your application until you can find the culprit.
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

Similar Messages

How can I avoid memory leak problem ?

I use Jdev 10.1.2 . I have a memory leak problem with ADF .
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and I have to support a lot of concurrent users .
as I know ADF stored data of view object in http session .
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I am new for ADF.
I try to use clearCache() on view object when I don't use it any more .
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ADF does not store data in the HTTP session.
See Chapter 28 "Application Module State Management" in the ADF Developer's Guide for Forms/4GL Developers on the ADF Learning Center at http://download-uk.oracle.com/docs/html/B25947_01/toc.htm for more information.
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[Bug?] X-Control Memory Leak with Large Data Array

[LV2009]
[Cross-posted to LAVA]
I have found that if I pass a large data array (~4MB in this example) into an X-Control, it causes massive memory allocations (1 GB+).
Is this a known issue?
The X-Control in the video was created, then the Data.ctl was changed to 2D Array - it has not been edited in any other way.
I also compare the allocations to that of a native 2D Array (which is only ~4MB).
Note: I jiggled the Windows Task Manager about so that JING would update correctly, its a bit slow, but it essentially just keeps rolling up and doesn't stop.
Demo code attached.
Cheers
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Unable to display content. Adobe Flash is required.
Certified LabVIEW Architect * LabVIEW Champion
Attachments:
X Control Bug [LV2009].zip ‏42 KB

Hi Jon (cool name)
Thank you very much for your reply. We came to this conclusion in the cross post and it is good to have it confirmed by LabVIEW R&D. Your response is also similar to that of my AE which I got this morning as well - see below:
Note: Your reference number is included in the Subject field of this
message. It is very important that you do not remove or modify this
reference number, or your message may be returned to you.
Hi Jon,
You probably found some information from the forum. The US engineer has gotten back and he said that unfortunately that's expected behaviour after they have conducted some tests and this is what he replied:
"X Controls in the background use events structures. In particular the Data Change Event is called when the value of the XControl changes (writing to the terminal, local variable, or value change property). What is happening in this case is the XControl is getting called to fast with a large set of data that the event structure is queuing the events and data that a memory leak is produced. It is, unfortunately, expect behavior. The main work around for the customer in this case is not call the XControl as often. Another possibility is to use the Synchronous Display Property to defer updates to the Xcontrol, this might slow down a leak."
He would also like to know if you can provide with more details how you are using the Xcontrol, perhaps there is a better way. Please refer to the link below for synchronous display. Thank you.
http://zone.ni.com/reference/en-XX/help/371361G-01/lvprop/control_synchronous_display/
In my application I updated the X-Control @ 1Hz and it allocated at MBs/s up to 1+GB before it crashed, all within a few hours. That is why I called it a leak. I am really worried that if this CAR gets killed, there will still be an issue lingering that makes using X-Controls a major problem under the above conditions. I have had to pull two sets of libraries from my code because of this - when they got replaced with native LabVIEW controls the leak when away (but I lost reuse and encapsulation etc...).
Anyways, I really want to use X-Control tho (now and in the future) as I like all other aspect of them. If you do not consider this a leak, can a different #CAR be raised that may modify the existing behavior? I offer the suggestion (in the cross-post) that the data be ignored rather than queued? Similar to Christian's idea, but for X-Controls. Maybe as an option?
I look forward to discussing this with you further.
Regards
-Jon
Certified LabVIEW Architect * LabVIEW Champion

How to root out memory leak with Java JNI & Native BDB 11g ?

We are testing a web application using the 32-bit compiled native 11g version of BDB (with replication) under 32-bit IBM 1.5 JVM via JNI under 64-bit RedHat Linux. We are experiencing what appears to be a memory leak without a commensurate increase in Java heap size. Basically the process size continues to grow until the max 32-process size is reached (4Gb) and eventually stops running (no core). Java heap is set to 2Gb min/max. GCs are nominal, so the leak appears to be native and outside Java bytecode.
We need to determine whether there is a memory leak in BDB, or the IBM JVM or simply a mis-use of BDB in the Java code. What tools/instrumentation/db statistic should be used to help get to root cause? Do you recommend using System Tap (with some particular text command script)? What DB stats should we capture to get to the bottom of this memory leak? What troubleshooting steps can you recommend?
Thanks ahead of time.
JE.
Edited by: 787930 on Aug 12, 2010 5:42 PM

That's troublesome... DB itself doesn't have stats that track VM in any useful way. I am not familiar with SystemTap but a quick look at it seems to imply that it's better for kernel monitoring than user space. It's pretty hard to get DB to leak significant amounts of memory. The reason is that it mostly uses shared memory carved from the environment. Also if you are neglecting to close or delete some object DB generally complains about it somewhere.
I don't see how pmap would help if it's a heap leak but maybe I'm missing something.
One way to rule DB out is to replace its internal memory allocation functions with your own that are instrumented to track how much VM has been allocated (and freed). This is very easy to do using the interfaces:
db_env_set_func_malloc()
db_env_set_func_free()
These are global to your process and your functions will be used where DB would otherwise call malloc() and free(). How you get usage information out of the system is an exercise left to the reader :-) If it turns out DB is the culprit then there is more thinking to do to isolate the problem.
Other ideas that can provide information if not actual smoking guns:
-- accelerate reproduction of the problem by allocating nearly all of the VM to the JVM and the DB cache (or otherwise limit the allowable VM in your process)
-- change the VM allocated to the JVM in various ways
Regards,
George

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.
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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.
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and
31   10/1/2009 1:58:37 PM Error:
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it doesn't seem to be causing an immediate problem, but i have had several unexplained Diadem lockups.
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jim

How to optimize the memory for a large labview array?

I am running LabView on Windows XP with 4 Gb of RAM. The array is 51X256X256 complex numbers, but I want 300x256x256. The program runs out of memory when I use more than 51-53 arrays of 256X256. I do not know how to use the in place element structure to modify the vi below. The unbundled/ bundle structures do not present symmetry. Anyone can help me with this? Thanks!
Mariana
Attachments:
array3Dc.JPG ‏22 KB
array3Dc_front.JPG ‏58 KB

Norbert,
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Thanks,
Mariana
Attachments:
data3Dc comp.vi ‏19 KB

I have a large number of photos imported into iPhoto with the dates wrong. How can I adjust multiple photos (with varying dates) to the same, correct, date?

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Remove the following to the trash and restart the computer and try again:
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How to define the memory leak in stability test

Hi
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kevin wrote:
Thank you for the input and all the info.
isn't java heap the same as memory allocated to the java process in my weblogic
starup script ?The heap is sized by the -Xmx and -Xms parameters you pass on the java
command-line. The permanent generation is separate.
>
let me also download jprobe and try to run it and see what it gives me.
I'd start by running with -verbose:gc. I'd want to know whether you're
running out of heap or permgen space.
-- Rob
kevin
Rob Woollen <[email protected]> wrote:
Unfortunately memory leaks are not fun to track down even with tools.
I'd first suggest determining whether you're running out of space in
the
permanent area (where classes are loaded), or you've exhausted the java
help space.
I'd start by adding -verbose:gc. Look at the gc messages right before
you hit the OutOfMemoryError. If there's plenty of space left, I'd
suspect you're running out of perm space. Search these newsgroups and
the web for MaxPermSize, and you should see plenty of info.
If you're running out of java heap, tools like jprobe and OptimizeIt
are
helpful. If you can tell me a little more about your application and
how you're testing it, I can offer some more tips.
-- Rob
kevin wrote:
Iam new to JAVA and weblogic. I have an application that runs out ofmemory time
and again.
please let me know how to pin point this problem and moreover, howto interpret
or understand that there is a problem. I have downloaded JPROFILE tool,but it
is very confusing to understand what is goin on in this tool.
If somebody can let me know how to interpret and understand the memoryleak, that
will be great !!!
thank you.

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Hi
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CREATE TABLE TEST
(ID NUMBER VDATE DATE );
BEGIN
FOR i IN 1 .. 100000 LOOP
    INSERT INTO TEST
    VALUES
      (i, TO_DATE(TRUNC(DBMS_RANDOM.VALUE(2452641, 2452641 + 364)), 'J'));
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END LOOP;
END;
CREATE TABLE RTEST1 ( ID NUMBER, VMONTH NUMBER );
INSERT INTO RTEST1
SELECT ID, TO_NUMBER(TO_CHAR(VDATE,'MM'))
FROM TEST ;
CREATE TABLE RTEST2 ( ID NUMBER, VMONTH NUMBER );
INSERT INTO RTEST2
SELECT ID, TO_NUMBER(TO_CHAR(VDATE,'MM'))
FROM TEST;
CREATE INDEX RTEST1_IDX2 ON RTEST1(VMONTH)
CREATE INDEX RTEST2_IDX1 ON RTEST2(VMONTH)
ALTER TABLE RTEST1 ADD CONSTRAINT RTEST1_PK PRIMARY KEY (ID)
ALTER TABLE RTEST2 ADD CONSTRAINT RTEST2_PK PRIMARY KEY (ID)
SELECT A.ID, B.VMONTH
FROM RTEST1 A , RTEST2 B
WHERE A.ID = B.ID
AND ( (A.ID = B.VMONTH) OR ( B.ID = A.VMONTH ) )
BEGIN
DBMS_STATS.gather_table_stats(ownname => 'PHASE30DEV',tabname => 'RTEST1');
DBMS_STATS.gather_table_stats(ownname => 'PHASE30DEV',tabname => 'RTEST2');
DBMS_STATS.gather_index_stats(ownname => 'PHASE30DEV',indname => 'RTEST1_IDX1');
DBMS_STATS.gather_index_stats(ownname => 'PHASE30DEV',indname => 'RTEST2_IDX2');
DBMS_STATS.gather_index_stats(ownname => 'PHASE30DEV',indname => 'RTEST1_IDX2');
DBMS_STATS.gather_index_stats(ownname => 'PHASE30DEV',indname => 'RTEST2_IDX1');
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Regards
RJ

I don't like it, but you could use a hint:
SQL>r
1 SELECT A.ID, B.VMONTH
2 FROM RTEST1 A , RTEST2 B
3 WHERE A.ID = B.ID
4* AND ( (A.ID = B.VMONTH) OR ( B.ID = A.VMONTH ) )
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=94 Card=2 Bytes=28)
   1    0   TABLE ACCESS (BY INDEX ROWID) OF 'RTEST2' (Cost=94 Card=1 Bytes=7)
   2    1     NESTED LOOPS (Cost=94 Card=2 Bytes=28)
   3    2       TABLE ACCESS (FULL) OF 'RTEST1' (Cost=20 Card=100000 Bytes=700000)
   4    2       BITMAP CONVERSION (TO ROWIDS)
   5    4         BITMAP AND
   6    5           BITMAP CONVERSION (FROM ROWIDS)
   7    6             INDEX (RANGE SCAN) OF 'RTEST2_PK' (UNIQUE)
   8    5           BITMAP OR
   9    8             BITMAP CONVERSION (FROM ROWIDS)
10    9               INDEX (RANGE SCAN) OF 'RTEST2_IDX1' (NON-UNIQUE)
11    8             BITMAP CONVERSION (FROM ROWIDS)
12   11               INDEX (RANGE SCAN) OF 'RTEST2_PK' (UNIQUE)
Statistics
          0 recursive calls
          0 db block gets
     300332 consistent gets
          0 physical reads
          0 redo size
        252 bytes sent via SQL*Net to client
        235 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          2 rows processed
SQL>SELECT /*+ ordered use_hash(b) */ A.ID, B.VMONTH
2    FROM RTEST1 A, RTEST2 B
3   WHERE A.ID = B.ID AND(A.ID = B.VMONTH OR B.ID = A.VMONTH)
4 ;
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=175 Card=2 Bytes=28)
   1    0   HASH JOIN (Cost=175 Card=2 Bytes=28)
   2    1     TABLE ACCESS (FULL) OF 'RTEST1' (Cost=20 Card=100000 Bytes=700000)
   3    1     TABLE ACCESS (FULL) OF 'RTEST2' (Cost=20 Card=100000 Bytes=700000)
Statistics
          9 recursive calls
          0 db block gets
        256 consistent gets
        156 physical reads
          0 redo size
        252 bytes sent via SQL*Net to client
        235 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
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I'm having trouble doing something that's probably not that hard. I'm trying to "Print to PDF" a bunch of old AppleWorks documents. When you open a document created in AppleWorks v6 it opens right up, but when you open a document created in AppleWorks 5 you get a dialog box that says, "This document was created by a previous version of AppleWorks. A copy will be opened and "[v6.0]" will be added to the filename."
Right now I open the file and then:
tell application "AppleWorks 6"
        activate
        repeat while not (exists front document)
                delay .2
        end repeat
end tell
When the dialog box pops up, there's no front document so the whole thing freezes until you hit OK. How can I detect this dialog box and dismiss it?
Thanks
PS
When the box is open I ran this and got this result:
/usr/bin/osascript -e 'tell application "System Events" to get properties of windows of application process "AppleWorks 6"'
minimum value:missing value, orientation:missing value, position:436, 153, class:window, role description:dialog, accessibility description:missing value, focused:missing value, title:missing value, size:412, 123, value:missing value, help:missing value, enabled:missing value, maximum value:missing value, role:AXWindow, entire contents:, subrole:AXDialog, selected:missing value, name:missing value, description:dialog, minimum value:missing value, orientation:missing value, position:8, 76, class:window, role description:floating window, accessibility description:missing value, focused:missing value, title:Starting Points, size:631, 189, value:missing value, help:missing value, enabled:missing value, maximum value:missing value, role:AXWindow, entire contents:, subrole:AXFloatingWindow, selected:missing value, name:Starting Points, description:floating window, minimum value:missing value, orientation:missing value, position:4, 22, class:window, role description:floating window, accessibility description:missing value, focused:missing value, title:Button Bar, size:612, 51, value:missing value, help:missing value, enabled:missing value, maximum value:missing value, role:AXWindow, entire contents:, subrole:AXFloatingWindow, selected:missing value, name:Button Bar, description:floating window

Hi,
The simplest would be to set the application preferences in the script.
Like this :
-- *** set prefs ****
tell application "AppleWorks 6"
      activate
      set oldPrefs to its preferences
      copy oldPrefs to tPrefs
      tell tPrefs
            set old version warning to false --doesn't show the old version warning alert
            set converted file suffix to true -- append “[v6.0]” to documents converted from older formats
            set locked file warning to false
            set paint reduction warning to false
      end tell
      set preferences to tPrefs
end tell
-- *** end set prefs ****
--**** your script, example ***
set tfiles to choose file with multiple selections allowed
tell application "AppleWorks 6"
      repeat with i in tfiles
            open i
            tell front document
                  -- do something
            end tell
      end repeat
end tell
--**** end your script ***
-- *** reset prefs ****
tell application "AppleWorks 6" to set preferences to oldPrefs

How can I detect a certain text within a field within CASE using IF

Dear all,
for a transformation / generation of values receiving from R/3 into BW I try to
manupulate three fields. I have a problem detecting a string in a field.
I am using a CASE with several WHEN clauses on one field. Depending on the
value, an IF is integrated. There I look into another field evaluating, if it contains
a certain string. E.g. IF STRING CP 'xyz' OR 'abc'.
System gives error for the locigal expression. I also tried CS, but same error.
How can I detect a certain text within a field and which is the right logical
expression.
Many thanks in advance!!!
Claudia

Hi,
Folow the blow example...
May be it helps....
DATA: hex1 TYPE string,
hex2 TYPE string.
hex1 = 'FFFF'.
hex2 = '123FF'.
IF hex1 CP hex2.
ENDIF.
Cheers,
SImha.

How can I transfer video taken with my iPhone to my iPad WITHOUT using a computer or iTunes? I'm going to Europe for a month and want to use my iPhone to take pics and video, then come back to the hotel room and use my iPad to edit/store each evening.

How can I transfer video taken with my iPhone to my iPad WITHOUT using a computer or iTunes? I'm going to Europe for a month and want to use my iPhone to take pics and video, then come back to the hotel room and use my iPad to edit/store each evening. I don't want to use my iPad to take the video...too large/bulky. And I WON'T have a computer with me...I purchased the iPad to take with me so I could use the RDC to my home computer and avoid taking my computer at all. Is this possible?

here is a cheaper solution than camera kit and a lot easier if you have WIFI available.
I use the PhotoSync APP (I think its a $1.99) will transfer videos and photos over WIFI to any other IOS device or even PC/MAC. Great app since I like doing video and photos on my IPHONE and transfer to IPAD2 without synching through computer or doing cloud based storage.
You can even send photos/videos from your MAC/PC to your IOS devices that way too. Makes it so much easier.
Here is the link;
http://www.photosync-app.com/

Memory Leak with ObjectInputStream - Any takers....

Hi,
Anyone see how to remove the memory leak problem in my objectInputstream ? Increases during the while loop...
private static String message = " ";
while(true) {
                    try {
                        message = (String) sharedRef.iStream.readObject();
                        System.out.println("Length of Message: " + message.length() );
                        message = null;
                        System.gc();
                        sharedRef.memchk();
                    } catch ( Exception e ) {
                        //sharedRef.screen.setText(buf.toString());
                        //sharedRef.screen.append("Connection closed...");
                        //sharedRef.closeConnections();
                        //this.stop();
                    }Output.... (example):
2006-04-10 16:11:51 +++ Free: 66067688
Length of Message: 92
2006-04-10 16:11:52 +++ Free: 66067448
Length of Message: 92
2006-04-10 16:11:52 +++ Free: 66067272
Length of Message: 92
2006-04-10 16:11:53 +++ Free: 66067032
Length of Message: 92
2006-04-10 16:11:53 +++ Free: 66066792
Length of Message: 92
2006-04-10 16:11:54 +++ Free: 66066552
Length of Message: 92
2006-04-10 16:11:54 +++ Free: 66066376
Length of Message: 92
2006-04-10 16:11:56 +++ Free: 66066136
Length of Message: 92
2006-04-10 16:11:57 +++ Free: 66065896
Length of Message: 92
2006-04-10 16:11:57 +++ Free: 66065656
Thanks

Object streams cache objects they've read and written. This is so that you don't have to write the same object multiple times if it's referred to multiple times. Let's say that both obj1 and obj2 have references to obj3. When you write obj1, it will also write obj3, and the OOStream will cache both obj1 and obj3. Later, when you go to write obj2, it will notice that it has already written obj2, and not write it again--it will just write a reference of sorts to indicate which already-written object obj2 points to as a member.
I would imagine OIStream must do the same thing. It would have to cache objects it's reading, so that when a "reference" (in the general sense) to a previous object appears, it can behandled properly.
On the OOS side, you can flush the cache by calling reset(). I doubt you can do anything about it in the OIS side. Input's behavior here must be driven by what was output.

How can i detect "Memory leak" with large LabVIEW projects.

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