Memory leak with Power Spectrum function

Hi
I have a memory leak on my application. By observing with the "Desktop Execution Trace Toolkit", the Power Spectrum function (from NI_AALPro.lvlib) seems to have two "Reference leak".
The first one refers to the function "Open VI reference"; I got around this problem by replacing the "Open VI reference" by an "Initialize" input boolean, but I don't understand the second memory leak.
Any idea ?
Thanks...
(See attachments : Desktop Execution Trace + code)
LV8.6.1 + Desktop Execution Trace Toolkit 2009
Same problem with LV2012 + Desktop Execution Trace Toolkit 2012
Attachments:
DesktopExecutionTraceToolkit.png ‏82 KB
MemoryLeakPowerSpectrum.zip ‏7 KB

Hi Mathilde,
Thank you for using NI Discussion Forums!
I reproduce this problem with LV2012 + Desktop Execution Trace Toolkit 2012. I will look further into this.
Are there many calls of this function in your code? Could it be a problem for you?
Thank you.
Regards,
Audrey_P
National Instruments France
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Journées techniques : des fondamentaux aux dernières technologies pour la mesure et le contrôle/comm...

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There is a memory leak in Flash Player that leads to Flash crashing, predictably and repeatedly, when used.
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When will this problem be fixed?
Evidence:
Observe the progression in the following single-take video of me playing my favorite Flash game, posted to Youtube. Skip to the times indicated in the "About" description for the video to observe the increase in use of physical memory, as observed in Windows Task Manager, until there isn't anything left.
http://www.youtube.com/watch?v=gNIJvTuUitU
My computer gets bogged down, the game stalls out, and Flash needs to be closed to enable my computer to function once more. It makes it impossible to play this specific game for very long, and is an insidious problem lurking in the background every time I watch a video, play a game, or use Flash Player for any purpose. My computer always slows down, with the problem worsening as time passes until I need to close everything and start again.
Details:
Flash Player Version: 11.7.700.224
Operating System: Windows Vista (32-bit)
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Conclusion:
If you need further information about my specific computer, please feel free to ask.
If this problem is specific to my computer, I would appreciate knowing this and determining a way to solve the problem. My suspicion is that the problem originates in Flash Player itself and is experienced by many people in a variety of circumstances. It is my hope that an articulate response indicating how long it will take to correct this bug in Flash Player can be provided.
Thanks in advance for your help.

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if (pSecurityDescriptor->Group != NULL) FreeSid(pSecurityDescriptor->Group);
if (pSecurityDescriptor->Sacl != NULL) LocalFree(pSecurityDescriptor->Sacl);
if (pSecurityDescriptor->Dacl != NULL) LocalFree(pSecurityDescriptor->Dacl);
LocalFree(pbSD);
Sleep(100);
return 0;
HCRYPTPROV GetContext()
HCRYPTPROV hProv = NULL;
HCRYPTKEY hKey = NULL;
CHAR szPPName[100];
DWORD dwPPNameLen = 100;
CHAR szPPContainer[100];
DWORD dwPPContainerLen = 100;
// Attempt to acquire a handle to the default key container.
if (CryptAcquireContext(
&hProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET))
printf("Opened default key container for crypto usage");
else
// Some sort of error occured...
printf("(Allowable) Error acquiring default key container for crypto usage - ");
// .. try to create default key container.
if(CryptAcquireContext(
&hProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
printf("Created key container for crypto usage");
else
printf("Error Creating key container for crypto usage - ");
return (NULL);
// Get CSP name.
if(CryptGetProvParam(
hProv,
PP_NAME,
(BYTE *)szPPName,
&dwPPNameLen,
0))
printf("Key CSP name is '%s'",szPPName);
else
// Error getting key container name.
printf("Failed to retrieve CSP name - ");
// Get name of key container.
if(CryptGetProvParam(
hProv,
PP_CONTAINER,
(BYTE *)szPPContainer,
&dwPPContainerLen,
0))
printf("Key container provider name is '%s'",szPPContainer);
else
// Error getting key container name.
printf("Failed to retrieve key container name - \n");
return hProv;

"BYTE* pbSD = (BYTE*)LocalAlloc(LHND,dwSDLen);"
LHND? It's surprising that this doesn't crash the program. Use LPTR.
More generally, stay away from LocalAlloc/LocalFree, use malloc/new/HeapAlloc. Use LocalAlloc only if the API you're working with specifically requires LocalAlloc, that's rare.

Memory Leak with RDC (11.5.11.1732) using SetDataSource

I believe I have identified a 20 byte memory leak each time a VB6 application calls Report.Database.SetDataSource and passes an ADO recordset (in craxdrt.dll version 11.5.11.1732 and earlier).
I've created a simple VB application which demonstrates the problem. The program repeatedly loads a report and optionally calls SetDataSource.
When running the program and monitoring for leaks with DebugDiag I observe the same 20 byte leak that I see in my live application if I enable calls to SetDataSource. Without the calls there is no leak.
I have uploaded the VB source code for the test application, RPT file used for the test and the reports from DebugDiag for both the leaky and non-leaky runs to [http://www.turambar.co.uk/download/crystal/CrystalTest.zip]
The two DebugDiag reports are as follows:
Memory_Report__Project1.exe__10212009140853486.mht - run with no calls to SetDataSource
Memory_Report__Project1.exe__10212009140007780.mht - run with calls to SetDataSource
Looking at the second of these reports it can be seen that the leak originates at "Project1!Form1::SDS+ec C:\CrystalTest\Form1.frm @ 89". That function contains a single line of code which calls SetDataSource.
Our live application is using CRXI R1 RTM (which has other leaks too but those disappear when upgrading to SP4).
For this test application I have used CRXI R2 with FixPack 5.6 and the error still manifests.
Option Explicit
Dim objApp As CRAXDRT.Application
Private Sub Form_Load()
    Set objApp = New CRAXDRT.Application
End Sub
Private Sub Form_Unload(Cancel As Integer)
    Set objApp = Nothing
End Sub
Private Sub Command1_Click()
    Dim i As Long
    Command1.Enabled = False
    DoEvents
    For i = 1 To CLng(Text1.Text)
        Call Stress
    Next
    Command1.Enabled = True
End Sub
Sub Stress()
    Dim objRep As CRAXDRT.Report
    Dim objRec As ADODB.Recordset
    Set objRec = New ADODB.Recordset
    Set objRep = objApp.OpenReport("test.rpt")
    If Check1.Value = vbChecked Then
         Call SDS(objRep, objRec)
    End If
    Set objRep = Nothing
End Sub
Sub SDS(objRep As CRAXDRT.Report, objRec As ADODB.Recordset)
    Call objRep.Database.SetDataSource(objRec)
End Sub

I've retested using VB.NET 2005. Still using ADO recordsets to pass the data through to Crystal.
        Dim objRep As ReportDocument
        Dim objRec As ADODB.Recordset
        Dim objConn As ADODB.Connection
        objConn = New ADODB.Connection
        objConn.Open("Provider=SQLOLEDB.1;Data Source=DB-HOST;Initial Catalog=TestDB", "simon", "mypass")
        objRec = New ADODB.Recordset
        objRec.CursorLocation = ADODB.CursorLocationEnum.adUseClient
        objRec.CursorType = ADODB.CursorTypeEnum.adOpenStatic
        objRec.LockType = ADODB.LockTypeEnum.adLockBatchOptimistic
        objRec.Open("SELECT TOP 1 * FROM simon.mytable", objConn)
        objRep = New ReportDocument
        objRep.Load("test.rpt")
        If Check1.CheckState = System.Windows.Forms.CheckState.Checked Then
            objRep.SetDataSource(objRec)
        End If
        objRep.Close()
        objRep.Dispose()
        objRep = Nothing
        objRec.ActiveConnection = Nothing
        objRec.Close()
        objRec = Nothing
        objConn.Close()
        objConn = Nothing
With the calls to SetDataSource in place DebugDiag is again reporting various leaks which do not happen when that call is not made. I'm not too hot on .NET code so I hope I'm doing all the right things to clear down before I do the leak analysis. My main calling form forces GC cleanup before I start the dump:
        GC.Collect()
        GC.WaitForPendingFinalizers()
I'm running this on Windows Server 2003 R2 SP2 with hotfix 939527 installed. For Crystal I installed CrystalReports11_5_NET_2005.msi from the 5.6 fixpack.
Simon

Memory Leak with the new PatchMix App Beta?

E6300/ASUS P5B-D/2GB RAM/EMU 0404/Vista Ultimate 32bit
The problem happens after I upgrade to the PatchMix driver set dated 9/11.
The physical memory usage bumps from ~24M to 150M after running 24 hours, and I didnt load any FX.
The commit size(real memory usage) is over 500M!
This doesnt happen with the old beta driver.
Anyone has the same problem?

Emon wrote:
jreid wrote:
Dare I suggest the problem might be Vista?
Yes? How exactly would Vista cause a memory leak within PatchMix DSP's GUI?
Well, just a thought. The OS is ultimately responsible for all memory management, and also the low-level graphics functions that would be called by e.g. the GUI code. I just noticed that people on XP didn't seem to be having the same problems with this beta.

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

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

Memory leak with Power Spectrum function

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