How Can I Efficiently Monitor C Program Memory Usage (VIRT and RES) at Runtime?

Using C to Get Memory Usage at Runtime

This article investigates how to obtain memory usage information, specifically VIRT and RES, at runtime in C .

Tried Approach and Challenges

An attempt to utilize the getrusage function for retrieving this data yielded consistently zero results.

Alternative Approach Using /proc Files

For Linux systems, reading data from "/proc/pid" files offers a reliable alternative to ioctl(). Here's a snippet with C constructs demonstrating this approach:

#include <unistd.h>
#include <ios>
#include <iostream>
#include <fstream>
#include <string>

void process_mem_usage(double& vm_usage, double& resident_set)
{
    vm_usage = 0.0;
    resident_set = 0.0;

    ifstream stat_stream("/proc/self/stat", ios_base::in);
    
    string vsize, rss;
    stat_stream >> vsize >> rss;
    stat_stream.close();

    long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024;
    vm_usage = stod(vsize) / 1024.0;
    resident_set = stod(rss) * page_size_kb;
}

int main()
{
    double vm, rss;
    process_mem_usage(vm, rss);
    std::cout << "VM: " << vm << "; RSS: " << rss << std::endl;
}

The above is the detailed content of How Can I Efficiently Monitor C Program Memory Usage (VIRT and RES) at Runtime?. For more information, please follow other related articles on the PHP Chinese website!