memory - w3toppers.com

Opening XPS document in .Net causes a memory leak

Well, I found it. It IS a bug in the framework and to work around it you add a call to UpdateLayout. Using statement can be changed to the following to provide a fix; Using XPSItem As New Windows.Xps.Packaging.XpsDocument(PathToTestXps, System.IO.FileAccess.Read) Dim FixedDocSequence As Windows.Documents.FixedDocumentSequence Dim DocPager As Windows.Documents.DocumentPaginator FixedDocSequence = XPSItem.GetFixedDocumentSequence DocPager = FixedDocSequence.DocumentPaginator DocPager.ComputePageCount() … Read more

BSXFUN on memory efficiency with relational operations

Introduction & Test Setup To perform memory tests to inquire about the points raised in the question, let’s define the inputs A and B: A = rand(M,N) B = rand(1,N) Here, M and N are the size parameters and are kept as really large numbers. I would be using repmat for comparisons as that seems … Read more

intrinsic memcmp

Note that the repz cmpsb routine might not be faster than glibc’s memcmp. In my tests, in fact, it’s never faster, even when comparing just a few bytes. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052

Binding to list causes memory leak

Ahhh got you. Now I understand what you mean. You set the Content to null and so you kill the compelte ListBox but still the ItemsSource binds to List and so ListBox memory is not completely released. That is unfortunately a well known issue and also well documented on MSDN. If you are not binding … Read more

Memory randomization as application security enhancement?

It increases security by making it hard to predict where something will be in memory. Quite a few buffer overflow exploits work by putting (for example) the address of a known routine on the stack, and then returning to it. It’s much harder to do that without knowing the address of the relevant routine. As … Read more

How to get the starting/base address of a process in C++?

Here’s another way, written in Visual Studio 2015 but should be backwards compatible. void GetBaseAddressByName(DWORD processId, const _TCHAR *processName) { _TCHAR szProcessName[MAX_PATH] = _TEXT(“<unknown>”); HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processId); if (NULL != hProcess) { HMODULE hMod; DWORD cbNeeded; if (EnumProcessModulesEx(hProcess, &hMod, sizeof(hMod), &cbNeeded, LIST_MODULES_32BIT | LIST_MODULES_64BIT)) { GetModuleBaseName(hProcess, hMod, szProcessName, sizeof(szProcessName) / … Read more

How can I store a value at a specific location in the memory?

You can do it like this: *(int *)0x16 = 10; // store int value 10 at address 0x16 Note that this assumes that address 0x16 is writeable – in most cases this will generate an exception. Typically you will only ever do this kind of thing for embedded code etc where there is no OS … Read more

phpexcel Allowed memory size of 134217728 bytes exhausted [duplicate]

There’s a lot been written about PHPExcel and memory use, and I’m not going to repeat it all here. Try reading some of the threads on the PHPExcel discussion board discussing the issue, such as this one; or previous answers here on SO such as this one or this one

What happens to memory after free()?

Your analogy is correct. The data in memory doesn’t disappear or anything like that; the values may indeed still be there after a free(), though attempting to read from freed memory is undefined behaviour.

Pass large amount of binary data from u-boot to linux kernel

You could use a custom ATAG to either pass the data block or to pass the address & length of the data. Note that the “A” in ATAG stands for ARM, so this solution is not portable to other architectures. An ATAG is preferable to a command-line bootarg IMO because you do not want the … Read more