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
I’m sure this is a duplicate, but I’ll answer it anyway: If you are viewing Task Manager size, it will give you the size of the process. If there is no “pressure” (your system has plenty of memory available, and no process is being starved), it makes no sense to reduce a process’ virtual memory … Read more
No, it is undefined behaviour. It just happens to work in your case, but may stop working at any time.
Test a; Test *t = new Test; a, and all its members, are on the stack. The object pointed to by t, and all its members, are on the heap. The pointer t is on the stack.
Most of the modern OS always reclaim back all memory they allocated to a program(process). The OS doesn’t really understand if your program leaked memory it merely takes back what it allocatted. But there are bigger issues at hand than just the memory loss: Note that if the destructor of the object whos delete needs … Read more
Answer from Romain Guy in Is it possible to chop a bitmap to small pieces without loading the entire thing into memory?: Android 2.3.3 has a new API called android.graphics.BitmapRegionDecoder that lets you do exactly what you want. You would for instance do the following: BitmapRegionDecoder decoder = BitmapRegionDecoder.newInstance(myStream, false); Bitmap region = decoder.decodeRegion(new Rect(10, … Read more
Short answer: Everything will be fine. Don’t worry about this and get back to work. Medium answer: Adding elements to or removing them from a vector invalidates all iterators and references/pointers (possibly with the exception of removing from the back). Simple as that. Don’t refer to any old iterators and obtain new ones after such … Read more
For the sake of clarity, I’ll briefly mention terminology. The two arrays are both local variables and arrays of rank 1. alloc_array is an allocatable array; automatic_array is an explicit-shape automatic object. Being local variables their scope is that of the procedure. Automatic arrays and unsaved allocatable arrays come to an end when execution of … Read more
I’ve solved the mystery – and I’m pretty sure this is a bug on Apple’s side. As Kendall suggested (thanks!), the problem lies in how InterfaceBuilder loads images from the NIB file. When you initFromNib, all UIImageViews will init with a UIImage using the imageNamed: method of UIImage. This call uses caching for the image. … Read more
As others already pointed out, Linux uses an optimistic memory allocation strategy. The difference between the first and the following memcpys is the initialization of DataDest. As you have already seen, when you eliminate memset(DataSrc, 0, N), the first memcpy is even slower, because the pages for the source must be allocated as well. When … Read more