如何跟踪C ++标准库调用的内存分配？

Question

Consider this simple example:

#include <algorithm>
#include <iostream>
#include <list>
#include <numeric>
#include <random>
#include <vector>
#include <iterator>
int main()
{
    std::list<int> l(10);
    std::iota(l.begin(),l.end(),77);

    std::vector<std::list<int>::iterator> v(l.size());
    std::iota(v.begin(), v.end(), l.begin());

    std::vector<int> dest;
    std::copy_if(l.begin(), l.end(), std::back_inserter(dest), [](int i){return i%2==1;});

    for(auto n : dest)
        std::cout << n << " ";
    return 0;
}

When run under Valgrind, it gives me the following output:

==27353==   total heap usage: 15 allocs, 15 frees, 380 bytes allocated

Is it possible to track exactly where those allocs occured (ie which data structure performed allocation and when exactly)?

Answer 1

The correct way to track C++ library allocation calls is to use Massif , a heap profiler tool (part of Valgrind):

1. Run Valgrind with Massif enabled:

   valgrind --tool=massif

2. Use ms_print to analyze output from Massif:

   ms_print massif.out.12345 (number varies)

Answer 2

Try giving valgrind the --keep-stacktraces=alloc option. Note using that option will increase the overhead of using valgrind. Here are the docs http://valgrind.org/docs/manual/mc-manual.html#mc-manual.options so you can fine tune what valgrind captures.