static-memory-allocation

问题 I would like to measure stack, heap and static memory separately because I have some constraints for each one. To measure the heap memory I'm using valgrind->massif tool. Massif should also be possible to measure heap AND stack memory but it shows strange resultats : Last snapshot without --stacks=yes provides total(B)=0, useful-heap(B)=0, extra-heap(B)=0 (so all is fine) Last snapshot with --stacks=yes provides total(B)= 2,256, useful-heap(B)=1,040, extra-heap(B)=0, stacks(B)=1,208 (which

问题 How the memory allocation is done for a char pointer array and double pointer. char *s[]={"knowledge","is","power"}; char **p; p=s; cout<<++*p; In the above code output given by compiler is- nowledge My question is just , how the values are assigned to pointer p and how it's incremented. 回答1: The operators ++ and * have the same precedence and are both right-to-left-associative, which means that the rightmost operator ( * ) is executed first. The value of *p is a pointer to the first

问题 I'm currently in the process of building an embedded system, using an ARM Cortex M3 processor, with 64 KB of SRAM. At the moment, I'm looking for a way to ensure deterministic performance with STL containers, which includes ensuring that I cannot end up running out of memory at run-time. I'm primarily concerned with how STL containers perform dynamic memory allocation. Although I can utilize a custom allocator to have these structures get memory from a pool which I set aside, I would need to

问题 I have heard in embedded system, we should use some preallocated fixed-size memory chunks(like buddy memory system?). Could somebody give me a detailed explanation why? Thanks, 回答1: In embedded systems you have very limited memory. Therefore, if you occasionally lose only one byte of memory (because you allocate it , but you dont free it), this will eat up the system memory pretty quickly (1 GByte of RAM, with a leak rate of 1/hour will take its time. If you have 4kB RAM, not as long)

问题 I would like to know what is the difference between static memory allocation and dynamic memory allocation? Could you explain this with any example? 回答1: There are three types of allocation — static, automatic, and dynamic. Static Allocation means, that the memory for your variables is allocated when the program starts. The size is fixed when the program is created. It applies to global variables, file scope variables, and variables qualified with static defined inside functions. Automatic