Detecting memory leaks in Managed C++

In my managed C++ application creating multiple variables dynamically using 'gcnew' and also some of the pointers being used.
Is there is any tool/mechanism to detect and avoid the memory leaks in Managed C++.
saikalyan

Hi saikalyan,
Is there is any tool/mechanism to detect and avoid the memory leaks in Managed C++.
You can use WinDbg tool to detect and avoid the memory leaks in Managed C++.
Please check this article:
http://www.codeproject.com/Articles/19490/Memory-Leak-Detection-in-NET
Best regards,
Shu Hu
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

Similar Messages

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

How to detect Memory Leaking Problem in Java

I have a Java multithreading program & I suspect that there is a memory leaking issue in the program. Can someone tell me how can I know how to detect where is the memory leakage in the program?
I have download a few tools like hat, jprobe, optimizeit but not sure how to use it. I am using jdk1.3.0 in HP-UX
Thks

Not so true, you could have a memory leak if you accidental hold on to a resource, or maybe you have threads running that you have no reference to, and those threads hold some resources.
Optimizeit is pretty easy to use. You start you application with Optimize it, so Optimizeit is you JVM so to speak. In optimizeit you can get a list of active objects. If this list grows and grows, you probably have a problem. Let it run for a while, and see which objects are the most present, dubble-click it, and it lets you step down into you methods. This way you can maybe find you leak.
Good luck :)

Can't find the memory leak in Managed Object

Hey guys...I am trying to find the memory leak that Instruments says I have in this section of code setting up a managed object:
oCurrentSection = (Section*) [NSEntityDescription insertNewObjectForEntityForName:@"Section" inManagedObjectContext:[[CoreDataManager sharedData] oManagedObjectContext]];
oCurrentSection.nsSectionName = [attributeDict objectForKey:@"name"];
oCurrentSection.nsImgUrl = [attributeDict objectForKey:@"imgURL"];
oCurrentSection.nsDesc = [attributeDict objectForKey:@"desc"];
oCurrentSection.iOrder = [NSNumber numberWithInt: [[attributeDict objectForKey:@"order"] intValue]];
Can anyone help me out?

Thanks everyone! That makes a lot more sense. Yes, kjon, I do come from windows. But please don't reference my troubled past. Actually, I typically use "ps aux | sort -n +3 | tail -1" rather than simply "ps aux" - I just wanted to make sure I wasn't missing something by looking at only the top memory-user. Glad to know there's no massive memory leak in my system
Procyon, what's wrong with a huge swap? Wouldn't you do it too if you were given a system with 200GB hdd more than necessary and told to make a webserver?
[root@norpass ~]# df -H
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 7.9G 1.1G 6.8G 14% /
none 1.1G 0 1.1G 0% /dev/shm
/dev/sda1 40M 9.9M 28M 27% /boot
/dev/sda4 238G 4.5G 234G 2% /home

Detect memory leak in JNI so files for linux and Solaris

I have to find the memory leaks in the JNI for solaris and linux but the issue is
i need to find the leaks in the so files.I have solved the issues of leaks using Purify
on windows but not getting appropriate support for linux. Any pointers to tools will help.I tried Valgrind on linux but it is not giving me the exact location of leak as in purify and also the support for purify is for 32 bit only.Valgrind is not showing any functions in .so files.JNI is not supported in Purify for Solaris? Please Help.

amol28 wrote:
I have to find the memory leaks in the JNI for solaris and linux but the issue is
i need to find the leaks in the so files.I have solved the issues of leaks using Purify
on windows but not getting appropriate support for linux. Any pointers to tools will help.I tried Valgrind on linux but it is not giving me the exact location of leak as in purify and also the support for purify is for 32 bit only.Valgrind is not showing any functions in .so files.JNI is not supported in Purify for Solaris? Please Help.If you have written the JNI, the JNI itself (java calls, methods, etc) to be OS agnostic then it shouldn't matter. In that case you check the windows code (not jni), the linux code (not jni) and the jni code itself independent of each other.
If you haven't made the JNI OS agnostic the question would be why not?

How to detect memory leak ????

I have an app that runs monitors system.
I tested it on the Win 2000 Pro, no prob it takes 8MB top
Once I moved it to Win 2000 Server the ram usage grows constantly, it is over 30 mb now
WHY?
Are there any issues with 2000 server?
HOw to debug it?
I try JProbe , ran app for 2 hours with Profiler and it does not go over 8 MB heap???
Thank you.

JVMs are the same.
How do you limit the heap???
JProbe did not fina anything but after a few hours I
got out of vertual memory error. Java took 300MB I
asumed it was because of JProbe.
Thnks Yarik.To limit the Java heap, you specify these paramaters
java -Xmx8m YourClassNameHere
However, given that you ran out of virtual memory, it sounds to me that something else is going on outside the Java heap. The heap limit, by default, is only 64MB, so that can't be it.
What version of Java are you using (use "java -version" to find out for sure).
Chuck

Allocated memory pool was not deleted! 1 GB memory leak is too much for me!

Dear Sirs. I found that DB environment, that was configured to use 1 GB cache size, won't free it when closed! Why? First I tried to open and close environment and got the following:
Detected memory leaks!
Dumping objects ->
{596} normal block at 0x01970040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{578} normal block at 0x00397978, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
Object dump complete.
I have and idea that BDB will reuse the memory, rite? OK, let's try to create the same environment and open it. After environment was opened, closed, opened again and again closed, I got the following:
Detected memory leaks!
Dumping objects ->
{3663} normal block at 0x01B80040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{3645} normal block at 0x00396E60, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
{596} normal block at 0x01970040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{578} normal block at 0x00397978, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
Object dump complete.
So memory was not reused, nor deallocated.
By the way, you may be interested in other leak I found, but fixed, see
Replication manager memory leak when setting local site information.
This leak is more serious, I am not sure I will fix it quickly. Maybe I'm doing something wrong? Could you please suggest something?
Thanks in advance!
With regards,
Vladislav.

OK, the problem solved by fixing code in file 'log.c', method '__log_dbenv_refresh'.
Just added the code that deallocates memory of bulk buffer.
if (IS_ENV_REPLICATED(dbenv))
if (lp->bulk_buf != INVALID_ROFF)
__db_shalloc_free(&dblp->reginfo, lp->bulk_buf);
lp->bulk_buf = INVALID_ROFF;
lp->bulk_len = 0;
lp->bulk_off = 0;
It was allocated in the '__log_open' function, by the following code:
          lp->ready_lsn = lp->lsn;
          if (IS_ENV_REPLICATED(dbenv)) {
               if ((ret = __db_shalloc(&dblp->reginfo, MEGABYTE, 0,
               &bulk)) != 0)
                    goto err;
               lp->bulk_buf = R_OFFSET(&dblp->reginfo, bulk);
               lp->bulk_len = MEGABYTE;
               lp->bulk_off = 0;
          } else {
               lp->bulk_buf = INVALID_ROFF;
               lp->bulk_len = 0;
               lp->bulk_off = 0;
Sorry for time taken to read my posts, I was really needy in quick help, but solved problems myself.

Memory leak when transferring pdf...help needed

Dear All,
I'm a newbie in developing java app. I'm making a web based application in reporting using JSP. java 1.6.02, jasper report 204, i-report 2.0.0
Client : OS : Win xp, memory 512MB
Server : Tomcat 6.0
DB Server : SQL Server 2005
OS Server : Windows Server 2003, memory 1GB
Report spec : .pdf based, with up to 1million record
Here's the code :
String query;
        try {
        String filereport = request.getRealPath("division/accounting/template/POReport.jrxml");
        InputStream input = new FileInputStream(filereport);
        Class.forName(odbcDriver);
        Connection conn = DriverManager.getConnection(odbcURL,username,passwd);
        ResultSet rset = null;
        CallableStatement cs = null;
        query = "{ call sp_tpo_list }";
          cs = conn.prepareCall(query);
          rset = cs.executeQuery();
        JRDataSource dataSource = new JRResultSetDataSource(rset);
        JasperDesign design = JRXmlLoader.load(input);
        JasperReport report = JasperCompileManager.compileReport(design);
        JasperPrint print = JasperFillManager.fillReport(report, null, dataSource);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JasperExportManager.exportReportToPdfStream(print, baos);
        response.setContentType("application/pdf");
        response.setContentLength(baos.size());
        ServletOutputStream sos;
        sos = response.getOutputStream();
        baos.writeTo(sos);
        sos.flush();
        rset.close();
        cs.close();
        conn.close();
        sos.close();
        baos.close();
        input.close();
        catch (FileNotFoundException fe) {}
        catch (JRException jre) {}
        catch (ClassNotFoundException cnfe) {}
        catch (SQLException sqle) {}
        catch (IOException ioe) {}I've already increase heap memory in Tomcat Manager -Xms 64Mb -Xmx 512Mb.
But when i test with 1million record, out of heap memory error is coming out.
When i test with 500.000 record, it work out, but only when 1 client access. More than 1 client, out of heap memory error generated by the system.
How can this happen? How can i detect memory leaks occured in the program?
And pls let me know if you see something is missing in the code above.
Thank you

I dont think you have a memory leak. I think the problem is the xml file is 1000000 records long and takes up too much memory. Even if you find a way to increase memory size, you are loading down the server too much for other people's applications to run. I suggest instead reading up on xml and learning how to read in only a few records at a time, processing it, and getting the next set of records to process. There are two methods to parse an xml file using an xml parser, one is to parse it all and put it in memory, the other is to process one record at a time (an xml book explains it better).
However, I question why you have reports that are 1000000 records long. end-users cannot effectively use such records (you cant scroll through 1000000 records). I suggest finding a way to greatly decrease the number of records in each file such as by providing just the records a particular user needs to do his job and not all records. For instance, put a textfield on his screen to let him only fetch records within a certain date range.
Lastly, I suggest putting your code in a try/catch/finally block where the finally block actually closes the objects. Example:
finally{
if(conn!=null)
conn.close();
}

Memory leak using GWT 1.4 and JDK 1.5

We are running the following:
OS : Solaris 5.10
WebLogic version: 10.0
JDK : Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
Java HotSpot(TM) Server VM (build 1.5.0_14-b03, mixed mode)
GWT : 1.4
Oracle : 10g
We have found memory leak with the above configuration.
After running 1 session we are facing memory leak. The used Java heap is 4% higher than the one used after we conduct
our memory tests for 1 user.
Similarly, after running 5 concurrent sessions we are also facing memory leak where Java heap memory is utilised more
by about 4%.
I have used JRockit JDK 1.5 for figuring out memory leak. I have not found a memory leak in any of the modules
developed by us.
The memory leak issue is we think concerned with the version of JDK, Weblogic, Sun OS.
Can somebody please suggest whether we can use the version as mentioned above?
Any help on this front will be appreciated.

gc log:
#log information
JAVA_OPTS="$JAVA_OPTS -verbose:gc "
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails "
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps "
JAVA_OPTS="$JAVA_OPTS -XX:+DisableExplicitGC "
JAVA_OPTS="$JAVA_OPTS -Xloggc:/path/to/gclog`date +%Y.%m.%d-%H:%M:%S`.log "Check sun papers for garbage collecting tips.
>
Is there any other way we can detect memory leak?
>
You have to profile your Application Server like you did with your own code.
regards
slowfly

Memory leak when I use function with bstr_t type

Hello,
I use Visual C++ 6 and TestStand 3.1.
I use the tool: Purify from Rational Instruments to detect memory leak in my code.
When I use in my code, functions from the TestStand API using bstr_t types: GetValString, GetType... memory leaks appear.
Do you have an idea to solve this problem?
Thanks

Breizh,
Etes vous sur que le problèmes soit lié au type bstr_r ?
Pouvez vous me faire parvenir un exemple de code mettant en oeuvre la fuite mémoire?
Raphaël T.
NI FRANCE
Cordialement,
Raphael T

Memory Leak in Swing.

Hi!
I have Real time application(JDK1.3). After each 30 sec it brings data from backend &puts into JTable.
But it works only for 6 to 8 hours. After that it gives error
in JVM.dll.
I'm using 3 threads. Main code is something like this.
public class Main extends Thread{
public void run(){
while(true)
try{
Testtable.Update();
Thread.sleep(30000);
}catch(InterruptedException e)
{ System.out.println("error occured");}
TestTable is a public class which extends AbstractTableModel. This is a inner class of Main class.
I have checked memory usage of java.exe. It increases
usage after sometime.
How to detect memory leak? Do have to do changes in my code? "vector" usage is more in this program.
Thanks,
Sujata.

Hi,
For cellrendering I have following code.
public class MultiLineHeaderRenderer extends JList implements TableCellRenderer{
public MultiLineHeaderRenderer() {
try{
setOpaque(true);
setForeground(UIManager.getColor("TableHeader.foreground"));
setBackground(UIManager.getColor("TableHeader.background"));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
ListCellRenderer renderer = getCellRenderer();
((JLabel)renderer).setHorizontalAlignment(JLabel.CENTER);
setCellRenderer(renderer);
}catch ( Exception err){
TeCILog.logTrace( this, "Failed to construct MultiLineHeaderRenderer." );
TeCILog.logError( this, err );
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected, boolean hasFocus, int row, int column)
setFont(table.getFont());
String str = (value == null) ? "" : value.toString();
BufferedReader br = new BufferedReader(new StringReader(str));
String line;
Vector v = new Vector();
try {
while ((line = br.readLine()) != null)
v.addElement(line);
br.close();
}catch (IOException ex) {
ex.printStackTrace();
} catch(Exception err){
System.out.println("error" + err );
setListData(v);
return this;
private ListCellRenderer renderer = null;
Does this is causing leakage?
Sujata

Tool to check memory leak

One of tmy applications has memory leak sometimes, not always. I find most tools to check the memory leak needs to reproduce the leak, but now I can not reproduce this issue, is there any tool to analyze the source code to find the memory leak?

Don't know about source code analyzer, but dbx, the Sun Studio debugger, is capable of detecting memory leaks at run time. You can use bcheck script on your application or start dbx, issue "check -leaks" and then run your app under dbx.

CVI dll to read XML file causes memory leak

Hello,
I am facing a memory leak issue when I execute a dll created using CVI to read a XML file.
Each iteration of the step is taking around 200k of memory.
Short description of the code:
Basically I am using a function created in CVI to read from an XML file by tag which 2 attributes: command and the response;
int GetCmdAndRsp(char XML_File[MAX_STR_SIZE], char tag[MAX_STR_SIZE], char Command[MAX_STR_SIZE], char Response[MAX_STR_SIZE], char ErrorDescription[MAX_STR_SIZE])
inputs:
- XML_File_path;
- tagToFind;
ouputs:
- Command;
- Response;
- Error;
Example:
XMLFile:
<WriteParameter Command="0x9 %i %i %i %i %i" Response = "0x8 V %i %i %i %i"/>
Execution:
error = GetCmdAndRsp("c:\\temp\\ACS_Messages.xml" ,"WriteParameter", cmd, rsp, errStr)
output:
error = 0
cmd = "0x9 %i %i %i %i %i"
rsp = "0x8 V %i %i %i %i"
errStr = "Unkown Error"
Everything is working correctly but I have this memory leak issue. Why am I having such memory consumption?? Is it a TestStand or CVI issue??
Each iteration I am loading the file, reading the file and discarding the file.
Attached you can find the CVI project, a TestStand sequence to test (ReadXML_test2.seq) and an example of a XML file I am using.
Please help me here.
Thaks in advance.
Regards,
Pedro Moreira
Attachments:
ReadXML_Prj.zip ‏1826 KB

Pedro,
When a TestStand step executes, its result will be stored by TestStand which will be later used for generating reports or logging data into database.
You are looking at the memory (private bytes) when the sequence file has not finished execution. So, the memory you are looking at, includes the memory used by TestStand to store result of the step. The memory used for storing results will be de-allocated after finishing the sequence file execution.
Hence, we dont know if there is actual memory leak or not. You should look at the memory, before and after executing sequence file instead of looking in between execution.
Also, here are some pointers that will be helpful for checking memory leak in an application:
1. TestStand is based on COM and uses BSTR in many function. BSTR caches the memory and because of the behavior, sometime you might get false notion of having memory leak. Hence, you need to use SetOaNoCache function OR set the OANOCACHE=1 environment variable to disable caching.
2. Execute the sequence file atleast once before doing the actual memory leak test. The dry run will make sure all static variables are initialized before doing memory leak test.
3. Make sure that the state of system or application is same when considering the Private bytes. Ex: Lets say ReportViewControl is not visible before you start executing sequence file. Then you note down the private bytes and then execute the sequence file. After finishing execution, make sure you close the ReportViewControl and then note down the private bytes once again to check if memory is leaked or not.
4. If there exists memory leak as you specified, it is possible that the leak is either in TestStand, or in your code. Make sure that your code doesn't leak by creating a small standalone application (probably a console application) which calls your code.
Detecting memory leaks in CVI is better explained in
http://www.ni.com/white-paper/10785/en/
http://www.ni.com/white-paper/7959/en/
- Shashidhar

Finding Memory leaks in C using Visual Studio 2013

I am using Visual Studio 2013, and taking a course in C programming and we started
talking about memory bugs detaction, in particular memory leaks, and how to detect them using Valgrind on Linux.
I want to know if there is a way to detect such memory leaks using VS 2013. I tried searching online but it just leads to lots of articles and blogs and msdn posts and blogs with lots of words like dump files, and analyzing them, etc which is weird
because:
1) It sounds so complex, convoluted and unintuitive it is actually hard to comprehend it.
2) The main reason this is weird is due to the fact that VS is the most advanced IDE around and Microsoft spends so much money on in, yet from what I have read it seems that there is no simple way to use VS to detect memory leaks
- certainly no way that's as simple as Valgrind where I only have to compile the program and run the command valgrind -leaks-check=yes ProgramName
and it simply prints to me all location it thinks there is a memory leak and describes the error (like not freeing memory after allocating it with malloc hence having "dead" memory after the program finishes, or accessing memory that's out of
the array bounds)
So my question is how to use VS 2013 in order to achieve the same results and to find out First in high level if there are memory leaks in the program, and Second - to detect in a simple manner where those leaks are- preferably without involving dump files
(not that I know how to use them anyway in VS).

Hi MicrosoftLaw,
Thanks for your post.
Based on your issue, if you want to check if there are memory leaks in the C program from this VS2013. I suggest you could try to find Memory Leaks Using the CRT Library, for more information:
https://msdn.microsoft.com/en-us/library/x98tx3cf.aspx?f=255&MSPPError=-2147217396
In addition, I find a similar thread about this issue, please you refer the Dusty's suggestion to check this issue.
http://stackoverflow.com/questions/45627/how-do-you-detect-avoid-memory-leaks-in-your-unmanaged-code
I did some research about this issue, I found that the Visual Leak Detector extension tool is a free, robust, open-source memory leak detection system for Visual C++. So if possible, I suggest you could try to use the Visual Leak Detector extension
tool to find the memory leak for Visual C/ C++ program.
https://visualstudiogallery.msdn.microsoft.com/7c40a5d8-dd35-4019-a2af-cb1403f5939c
However, if you have any issue about how to use this Visual Leak Detector extension tool to find the memory leak for C program. I suggest you could directly to write a review to this REVIEW tab in Visual Leak Detector site.
Best Regards,
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

When firefox crashes from a memory leak why can't you display the offending tab? Enhancement: a task manager like tab manager showing usage per tab / extension.

I typically keep many windows with several tabs open. It is possible that this causes more crashes since the number of pages multiplies any effect most users with less pages/tabs would experience. I have been having problems with Firefox crashing Using the windows task manager I have looked into this issue monitoring lots of variables. Bottom line the crash is caused by increasing memory usage possibly caused by the flash add on which is doing many IO reads on at least one offending page/tab. Could some sites be using flash to read from my disk without permission and there is a memory leak in either flash of the code the sites uses? I have searched the web for a task manager like add-on for Firefox tabs that would allow me to determine the offending page/tab/add-on/extension. It seems like a great idea which has not been implemented. Since I am a developer I would be happy to implement, but would like some guidance since my knowledge of your product is only at the user level.

There is currently about:memory page which is being actively developed. A "task manager"of sorts is also in the works AFAIK. If you want to help out, your best bet is to find the applicable bug in Bugzilla. If you have the coding skills I can help get you in touch with a mentor - just let me know.

Detecting memory leaks in Managed C++

Similar Messages

Maybe you are looking for