The symbol quality is not very good, it can only see exported functions, be sure to setup the symbol server with the _NT_SYMBOL_PATH environment variable.TppWorkerThread is the entrypoint for a threadpool thread, not your code, watch out for Windows 10.
Using UMDH to Find a User-Mode Memory Leak. 5 minutes to read. Contributors. In this article The user-mode dump heap (UMDH) utility works with the operating system to analyze Windows heap allocations for a specific process.
UMDH locates which routine in a specific process is leaking memory. UMDH is included in Debugging Tools for Windows.
For full details, see. Preparing to Use UMDH If you have not already determined which process is leaking memory, do that first. For details, see. The most important data in the UMDH logs are the stack traces of the heap allocations. To determine whether a process is leaking heap memory, analyze these stack traces. Before using UMDH to display the stack trace data, you must use to configure your system properly.
GFlags is included in Debugging Tools for Windows. The following GFlags settings enable UMDH stack traces:. In the GFlags graphical interface, choose the Image File tab, type the process name (including the file name extension), press the TAB key, select Create user mode stack trace database, and then click Apply. Or, equivalently, use the following GFlags command line, where ImageName is the process name (including the file name extension): gflags /i ImageName +ust Use this command to clear the GFlag settings once you are done. For more information, see. Gflags /i ImageName -ust.
By default, the amount of stack trace data that Windows gathers is limited to 32 MB on an x86 processor, and 64 MB on an x64 processor. If you must increase the size of this database, choose the Image File tab in the GFlags graphical interface, type the process name, press the TAB key, check the Stack Backtrace (Megs) check box, type a value (in MB) in the associated text box, and then click Apply. Increase this database only when necessary, because it may deplete limited Windows resources. When you no longer need the larger size, return this setting to its original value. If you changed any flags on the System Registry tab, you must restart Windows to make these changes effective. If you changed any flags on the Image File tab, you must restart the process to make the changes effective. Changes to the Kernel Flags tab are effective immediately, but they are lost the next time Windows restarts.
Before using UMDH, you must have access to the proper symbols for your application. UMDH uses the symbol path specified by the environment variable NTSYMBOLPATH. Set this variable equal to a path containing the symbols for your application. If you also include a path to Windows symbols, the analysis may be more complete. The syntax for this symbol path is the same as that used by the debugger; for details, see. For example, if the symbols for your application are located at C: MySymbols, and you want to use the public Microsoft symbol store for your Windows symbols, using C: MyCache as your downstream store, you would use the following command to set your symbol path: set NTSYMBOLPATH=c: mysymbols;srv.c: mycache.In addition, to assure accurate results, you must disable BSTR caching. To do this, set the OANOCACHE environment variable equal to one (1).
Make this setting before you launch the application whose allocations are to be traced. If you need to trace the allocations made by a service, you must set OANOCACHE as a system environment variable and then restart Windows for this setting to take effect. On Windows 2000, in addition to setting OANOCACHE equal to 1, you must also install the hotfix available with. This hotfix is not needed on Windows XP and later versions of Windows. Detecting Increases in Heap Allocations with UMDH After making these preparations, you can use UMDH to capture information about the heap allocations of a process.
To do so, follow this procedure:. Determine the for the process you want to investigate.
Use UMDH to analyze the heap memory allocations for this process, and save it to a log file. Use the -p switch with the PID, and the -f switch with the name of the log file. For example, if the PID is 124, and you want to name the log file Log1.txt, use the following command: umdh -p:124 -f:log1.txt ```dbgcmd. Use Notepad or another program to open the log file. This file contains the call stack for each heap allocation, the number of allocations made through that call stack, and the number of bytes consumed through that call stack.
Because you are looking for a memory leak, the contents of a single log file are not sufficient. You must compare log files recorded at different times to determine which allocations are growing.
UMDH can compare two different log files and display the change in their respective allocation sizes. You can use the greater-than symbol ( ) to redirect the results into a third text file.
You may also want to include the -d option, which converts the byte and allocation counts from hexadecimal to decimal. For example, to compare Log1.txt and Log2.txt, saving the results of the comparison to the file LogCompare.txt, use the following command: umdh log1.txt log2.txt logcompare.txt. Open the LogCompare.txt file. Its contents resemble the following: + 5320 ( f110 - 9df0) 3a allocs BackTrace00B53 Total increase 5320 For each call stack (labeled 'BackTrace') in the UMDH log files, there is a comparison made between the two log files. In this example, the first log file (Log1.txt) recorded 0x9DF0 bytes allocated for BackTrace00B53, while the second log file recorded 0xF110 bytes, which means that there were 0x5320 additional bytes allocated between the time the two logs were captured. The bytes came from the call stack identified by BackTrace00B53.
To determine what is in that backtrace, open one of the original log files (for example, Log2.txt) and search for 'BackTrace00B53.'
Recommended: Possible umdh.exe Error Messages. 'umdh.exe cannot be found.' . 'This program can't start because umdh.exe is missing from your computer.' . 'umdh.exe is missing.' .
'There was a problem starting path umdh.exe. The specified module could not be found.' . 'Runtime Error.
Umdh.exe pure virtual function call.' . 'Access Violation File path umdh.exe'. 'Unable to launch the software located at path: path umdh.exe'. 'This application requires the file umdh.exe, which was not found on this system.' Recommended: If you're not good at computers, it's recommended that you use this Automatic Error Fix Tool to fix this kind of problem. Possible Causes of umdh.exe Error You may get umdh.exe error message when you are trying to run or install some applications.
This kind of error can happen when Windows or software starts or shuts down, or maybe when you are using the computer or software. When and how this umdh.exe error happens is very important and helpful to figure out the cause and work out the effective solution. Umdh.exe error may be caused by the following situations:. umdh.exe file may be mistakenly deleted by someone, computer antivirus or system cleaning tools. umdh.exe file is corrupted or damaged by virus infections.
Some applications were installed or uninstalled improperly. The configuration entries of umdh.exe file is still active in the systemregistry. There may be something wrong with your computer hardware. How to Fix umdh.exe Error Manually? Warm Tips: It's not recommended to download umdh.exe file from those so-called DLL download websites, because those DLL files provided on those DLL download websites may be out-dated, incompatible with your system or software, or even infected with malicious malware. So if you need a copy of umdh.exe file, it's best for you to get it from its original and legitimate source. If you are not able to use your computer normally due to kind of umdh.exe error message, you can start your computer into Safe Mode to fix your problem with any of the following methods.
Video of How to start computer into Safe Mode For Windows 7/Vista For Windows 8 Fix methods: 1.Use System Restore to roll back to the previous system status. If you have created a system restore point before getting umdh.exe error, you can do a system restore to the previous restore point to fix the error. By doing a system restore, you will lose your software, data and some settings. 2.Use Registry Cleaner to repair umdh.exe error. Umdh.exe error may be caused by related problems in the system registry. A registry cleaner could be very helpful to help you remove those invalid registry entries or fix other registry issues related to umdh.exe file and it could save your time and risk to find and delete them by yourself. Repairing the registry can fix most of this kind of computer errors, click and download this Automatic Fix Tool.
Note: The registry is the most important part of the Windows Operating System and stores all information and configuration about how the Windows runs. So if you do not have sufficient computer know-how, it's not recommended that you edit the registry by yourself. 3.Reinstall the associated software that uses umdh.exe file.
If you receive umdh.exe error when you want to use certain software, then you can try to reinstall this software to obtain this umdh.exe file.This will be very helpful to obtain umdh.exe file that is not provided by Microsoft. Some program needs you to completely uninstall it before you re-install it.
So if you want to re-install the associated software, it's advisable for you to uninstall it from Control Panel completely. 4.Update the drivers for your hardware devices.
If you receive umdh.exe error message when you run your games, watch movies or play your music, you may try to update the drivers for your video card or graphic card. Please know that updating the drivers is a way to fix some computer problems, but you have to update the associated drivers according to the error message. 5.Scan your whole computer for virus infections. When a virus infection infects umdh.exe file, it will add some malicious code and modify your umdh.exe file. So you could see umdh.exe error message popping up when running a software or turning on your machine, as this infected umdh.exe file cannot work properly.
It's also possible that this umdh.exe error message is created by some virus that deliberately generates such fake error messages to scare you and mislead you buying its useless products.Click and download to check your system. 6.Execute the sfc /scannow command The sfc /scannow feature will check all of essential Windows files and replace it if the System File Checker (sfc) finds it's corrupted, damaged or missing. To run sfc /scannow command, please follow the steps: For Windows 8 Users 1).Press 'Windows+X' to bring up the menu below and then select 'Command Prompt (Admin)' option. 2).Click 'Yes' to run the command. 3).Type in sfc /scannow(There's a space between sfc and /scannow) into the dialog and hit Enter key. 4).Wait until the System File Checker finishes the check.
For Windows 7 and Vista Users: 1).Press 'Windows+R', type in cmd and then right click 'Run as administrator' 2).Type in sfc /scannow (There's a space between sfc and /scannow) into the dialog and hit Enter key. 3).Wait until the System File Checker finishes the check. 7.Install or Roll back to the old versions of device drivers If umdh.exe error happens after you update your software or hardware devices, you could find and re-install the old version of the driver.
You can also use the 'Roll Back' feature in Windows system. 8.Install the latest Windows updates. Microsoft often releases new service packs and system patches to replace or update some DLL files of Windows system. So you could try to install the latest Windows updates to fix umdh.exe error if umdh.exe file is included in one of those updates. 9.Re-install your Windows system. A new installation will format your hard drive and install a fresh copy of Windows system. But you should know that all of your personal data, programs and system patches will be completely removed if you re-install your Windows system.
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It's advisable for you to try the above advice before you re-install your computer. It's recommended to use Automatic Error Fix Tool to fix your umdh.exe error. Testimonials. Great! My computer runs much faster now. I never thought there were so many problems with my computer until I read your guide and use your tool.
My computer seems to start up very fast now and the error message does not pop up any more.Zoe C, US. I always got an error message telling me that a DLL file cannot be found. My mind got blank, as I didn't know what a DLL file is, let alone fix it.I did a search and found your website. I felt helpless and decided to give a try of your advice. It fixed the error! You're really my life saver!
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