如何获得我的程序分配的内存大小？

Question

I write my project by c with opencv. I want print info about allocated memory or memory used by my program. Is there a functions, that give me the information about the memory ? Finally I'm using Qt for Linux and Windows ,

Thanks in advance.

Answer 1

You can write wrappers to malloc and free that track how much memory you're using.

EDIT: If you also want to intercept calls to malloc and free in external libraries, you will have to define them in a shared library and load it before libc. How you do this depends on your OS.

Answer 2

On Linux you look into your own process info pseudo-file :

/proc/[pid]/statm
Provides information about memory usage, measured in pages. The columns are:
size       total program size
           (same as VmSize in /proc/[pid]/status)
resident   resident set size
           (same as VmRSS in /proc/[pid]/status)
share      shared pages (from shared mappings)
text       text (code)
lib        library (unused in Linux 2.6)
data       data + stack
dt         dirty pages (unused in Linux 2.6)

On Windows you look at you own process Process Object performance counters:

Private Bytes Shows the current number of bytes that this process has allocated that cannot be shared with other processes.

Answer 3

You can also do some level of memory analysis of Code/Data segment during build time if you check elf, dump or map file. And GCC command line options for stack usage are: -fstack-usage and -fcallgraph-info.