API调用以获取当前的过程大小

我正在调试大型C 应用程序中的缓慢内存泄漏，我想在程序中的各个点上打印出 current heap大小。/p>

除了打开和解析/proc/PID/statm外，我可以从中获得此信息吗？

但是，一篇帖子建议sbrk()返回当前的堆指针，而不是我想要的100％。（第二个问题：sbrk()值的更改是否对应于当前堆大小的变化？）

我看上去很奇怪，没有系统调用...

谢谢

更新i

我已经在调用sbrk()和读取proc/.../statm之间进行了一些测试比较。看来sbrk() 没有反映实际分配。相反，statm似乎测量了实际分配，而sbrk()显示了总堆大小。

大块的总批量增量（等于页面大小？）。

下面的测试程序会产生此输出（ heap size sbrk()和记忆使用情况，如/proc/.../statm报道，清楚地显示了差异：

0 ALLOC: HEAP SIZE: 0
MEMORY USAGE: 1308 201 174 2 0 566 0
1 ALLOC: HEAP SIZE: 135168
MEMORY USAGE: 1565 212 184 2 0 823 0
2 ALLOC: HEAP SIZE: 135168
MEMORY USAGE: 1822 216 187 2 0 1080 0
3 ALLOC: HEAP SIZE: 135168
MEMORY USAGE: 2079 217 187 2 0 1337 0
4 ALLOC: HEAP SIZE: 135168
MEMORY USAGE: 2336 218 187 2 0 1594 0
5 ALLOC: HEAP SIZE: 135168
MEMORY USAGE: 2593 219 187 2 0 1851 0
0 FREE: HEAP SIZE: 135168
MEMORY USAGE: 3364 225 189 2 0 2622 0
1 FREE: HEAP SIZE: 135168
MEMORY USAGE: 3107 224 189 2 0 2365 0
2 FREE: HEAP SIZE: 135168
MEMORY USAGE: 2850 223 189 2 0 2108 0
3 FREE: HEAP SIZE: 135168
MEMORY USAGE: 2593 222 189 2 0 1851 0
4 FREE: HEAP SIZE: 135168
MEMORY USAGE: 2336 221 189 2 0 1594 0
5 FREE: HEAP SIZE: 135168
MEMORY USAGE: 2079 220 189 2 0 1337 0

测试程序

class CfgProfileList
{
public:
    bool obtainSystemProfileList();
    void leakObjTest();
    std::set<std::string> mProfileList;
private:
    char dummy[1024 * 1024]; // use up some space
};
class ComUtil
{
public:
    static void printMemoryUsage();
private:
    static unsigned int mHeapOrigin;
};
/* static */
unsigned int ComUtil::mHeapOrigin = 0;
// Print current process memory utilization
/* static */ void
ComUtil::printMemoryUsage()
{
    unsigned int pHeap = (unsigned int)sbrk(0);
    if (mHeapOrigin == 0)
        mHeapOrigin = pHeap;
    printf("HEAP SIZE: %un", pHeap - mHeapOrigin);
    char fname[256], line[256];
    sprintf(fname, "/proc/%d/statm", getpid());
    FILE *pFile = fopen(fname, "r");
    if (!pFile)
        return;    
    fgets(line, 255, pFile);
    fclose(pFile);
    printf("MEMORY USAGE: %s", line);
}   
void
CfgProfileList::leakObjTest()
{
    CfgProfileList *pointerList[50];
    int  n = 10;
    int  sleep = 100000;
    printf("OBJECT ALLOCATIONn");    
    for (int i = 0; i < n; i++)
    {
        pointerList[i] = new CfgProfileList;
        printf("%d ALLOC: ", i);
        ComUtil::printMemoryUsage();
        usleep(sleep);
    }
    printf("n");
    for (int i = 0; i < n; i++)
    {
        delete pointerList[i];
        printf("%d FREE: ", i);
        ComUtil::printMemoryUsage();
        usleep(sleep);
    }
}
int
main(int argc, char **argv)
{
    CfgProfileList pl;
    pl.leakObjTest();
}