get the peak vm

test_vm_peak.cpp

#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <vector>
#include <utility>
#include <iostream>
#include <fstream>
#include <sstream>

//getpid
#include <unistd.h>
////mkdir
#include <sys/stat.h>
////setvbuf
#include <cstdio>
////ptrace
#include <sys/ptrace.h>
////rusage
#include <sys/resource.h>
//
////wait4
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/user.h>
using namespace std;

int get_memory_usage(pid_t processPid) {
    char buffer[64];
    sprintf(buffer, "/proc/%d/status", processPid);
    FILE* fproc = fopen(buffer, "r");
    if (fproc == NULL) {
        return -1;
    }
    int vmPeak = 0;
    while (fgets(buffer, 32, fproc)) {
        if (!strncmp(buffer, "VmPeak:", 7)) {
            sscanf(buffer + 7, "%d", &vmPeak);
        }
    }
    fclose(fproc);
    return vmPeak;
}

int main() {
    cout<<"vmpeak (KB) "<<get_memory_usage(getpid())<<endl;
   return 0;
}