Sorry if the question isn't clear; I found it pretty hard to explain in one sentence. Say I have a struct with a member which is a struct, e.g. the following: struct A { struct B b; }; Lets say I intend instances of this structure to be heap-allocated always. Is there anything to be gained by changing it to this? (i.e. keeping a ...
I am working on a group senior project for my university and I have run into a major hurdle in trying to get my code to work. The compiler that we have for our 8 bit Atmel microcontroller does not support the new or delete operators, and it does not support the C++ STL. I could program it in C, but I have to implement an A* algorithm w...
I've been staring at this same issue for a long time now, and would really appreciate any help or suggestions. I'm sure its something simple, but I can't seem to find it. In my app delegate I'm loading up a bunch of accessory objects (an object I created, which supports NSCopying) with the following code: NSString *path = [[NSBundl...
Hello, I am working on a trace tool for multithread applications, more especially about memory allocation. I would like a per thread memory allocation. I know that when a thread do a malloc, the memory used is the global heap. I would like to trace which thread allocated how much memory. I did a wrapper upon malloc, incrementing value...
I am continuing my saga to understand memory consumption by VB6 application. The option that seems to work best so far is to monitor various memory metrics at key points at run-time and understand where big memory hogs are. The measure driver to study this, is to understand how the application scalability in multi-user environment in Ter...
I'd like to attach to another process from a .Net console app and explore the data area. Specifically I would like to attach to the 'Spider Solitaire' app in Windows Vista as I am interested in seeing if the cards it deals out are solveable in all situations. Is this possible and if so which APIs should I be looking at? This is a 'just...
Please don't close this saying a duplicate question. I made an important change so not to confuse people, I resubmitted this much clearer codes. Please help me to solve this memory allocation problem. I'm working on a HashTable and this is what I've (partial codes only) main.c HashTablePtr hash; hash = createHashTable(10); insert(hash...
For instance, in VB.NET: Dim strArray(5) As String As I understand it, because this is an array, the computer will allocate contiguous memory locations for each of the 5 elements. But how much space is allocated for each of the five elements? What if I decide to put a 5MB block of text in position 2 of the array? Is it differen...
I would like to initialize an array of structs, with the same element repetitively, ie struct st ar[] = { {1,2}, {1,2}, {1,2} }; However I do NOT want to run any code for that, I wish that the layout of the memory upon program's execution would be like so, without any CPU instructions involved (it would increase boot time on very slow...
Hi, I have 2 classes, one that writes multiple 96bit objects to a buffer (32bits at a time - 3x int32), and one that i want to read from the same buffer. The first class (Writer) reserves and area of memory and creates a pointer to the first 32bit area. 1) How do I write to the buffer safely (ignoring buffer overflow for now)... I nee...
GIVEN that you have a fixed area of memory already allocated that you would like to use, what C or C++ libraries will allow you to store a dynamic structure (e.g. a hash) in that memory? i.e. the hash library must not contain any calls to malloc or new, but must take a parameter that tells it the location and size of the memory it is pe...
I am trying to use a malloc of short, something like typedef union _SOME_STRUCT_ { struct { USHORT u:4; USHORT v:4; USHORT w:4; } x; USHORT word; } SOME_STRUCT, *PSOME_STRUCT; PSOME_STRUCT p = malloc (sizeof (SOME_STRUCT)); if (p) { p->x.u = 0; } free (p); // **** RANDOMLY CRASHING HERE **** I am d...
The main motivation: to use the movntdqa assembler command to avoid stack pollution. This command only works with write combining memory (also called WS and USWC) ...
I am running a simulation with a lot if bunch of initial memory allocations per object. The simulation has to run as quickly as possible, but the speed of allocation is not important. I am not concerned with deallocation. Ideally, the allocator will place everything in a contiguous block of memory. (I think this is sometimes called a...
I'm loading a nib as: ContentViewController *theController = [[ContentViewController alloc] initWithNibName:@"ContentView" bundle:nil]; which has a label on it. The view controller has an IBOutlet of UILabel with a @property of retain and synthesized variable. When I load the nib as above from another class and reference the label's...
I want to make sure I don't pummel the permgen space, so I'm carefully interning my strings. Are these two statements equivalent ? String s1 = ( "hello" + "world" ).intern(); String s2 = "hello".intern() + "world".intern(); UPDATE How I framed my question was totally different from the actual application. Here's the method where I...
What is the maximum memory the garbage collector can allocate for a .NET process? When i compile to x64, Process.GetCurrentProcess.MaxWorkingSet returns about 1,4GB, but when i compile to AnyCPU (x64) the same number is returned. For x64 it should be more like the "Limit" value that is displayed in the Task Manager. How can i get the cor...
I'm writing an installer that will tune the configuration of the product for the particular hardware on which it will be run. In particular, I want to determine how much physical RAM is installed in the system so I can estimate how much memory to allocate to the product when it runs. Ideally, I'd like to do this in a platform-independe...
I have been working on an open source project for awhile, http://gtkworkbook.sourceforge.net/, and recently ran into an issue that just seems like I am going in circles. I'm pretty sure there is a heap problem but I have been looking at this code too long to figure out exactly what it is. So, in brief, what I am doing is reallocating a...
Below is my C wrapper for a Fortran ZHEEVR routine from well-known LAPACK numerical library: void zheevr(char jobz, char range, char uplo, int n, doublecomplex* a, int lda, double vl, double vu, int il, int iu, double abstol, double* w, doublecomplex* z, int ldz, int* info) { int m; int lwork = -1; int liwork = -1; int l...