Report how much memory on stack/heap is being used by an object? (GDB)

Question

How would I determine the total amount of memory an object is using, and what percentage of that memory currently exists on the stack? What about the heap as well?
For example, given this program:

#include <cstdlib> #include <vector> #include <string> int main(){ //I wonder how much memory is being //used on the stack/heap right now. std::vector<std::string> vec{"11","22","33"}; //how about now? return EXIT_SUCCESS; }

how can I view the size of the stack and heap before and after the creation of the vector?
Is this possible to do this with GDB?
The manual provides some information on examining memory, but I haven't been able to report such information.

sizeof vec will be the stack size it takes since you allocated it on the stack. The free store size should be something like vec.capacity() * sizeof(std::string). — Qaz
– Qaz, Commented Nov 28, 2012 at 22:59
For measuring heap usage, you might have a look at valgrind's massif tool: valgrind.org/docs/manual/ms-manual.html — Jeremy Friesner
– Jeremy Friesner, Commented Nov 28, 2012 at 23:11
Regarding heap, you may want to check out this gdb extension: fedorahosted.org/gdb-heap — Miroslav Franc
– Miroslav Franc, Commented Nov 29, 2012 at 20:38

Flexo - Save the data dump · Accepted Answer · 2012-11-28 23:28:33Z

If you're prepared to use GLIBC specific functions you can use mallinfo() directly within your program to answer the question:

#include <cstdlib> #include <vector> #include <string> #include <iostream> #include <malloc.h> int main(){ std::cout << "Using: " << mallinfo().uordblks << "\n"; std::vector<std::string> vec{"11","22","33"}; std::cout << "Using: " << mallinfo().uordblks << "\n"; return EXIT_SUCCESS; }

Collectives™ on Stack Overflow

Report how much memory on stack/heap is being used by an object? (GDB)

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related