c++ - 使用静态链接替换 ​​Windows tcmalloc

Question

一个C++项目遇到内存碎片问题，尝试如下:

1. nedmalloc-没有通过压力测试(15 小时后崩溃)，这意味着它在大多数情况下都有效，但不是全部。以及比其他分配器更多的内存使用量。

2. jemalloc-还没有为 Windows 做好准备？

3. tcmalloc-使用带有静态链接的主机代码编译，但与 CRT 符号冲突。我可以只使用像 tc_malloc(...) 这样的别名来构建我自己的分配包装器吗？怎么做？

有什么意见吗？提前致谢。

Answer 1

使用 this API 设置您的项目以使用 Windows 低碎片堆 (LFH)在程序的开始。这可能会解决您的问题，而无需对自定义实现进行更多工作。

示例代码，直接取自 MSDN:

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

#define HEAP_LFH 2

int __cdecl _tmain()
{
    BOOL bResult;
    HANDLE hHeap;
    ULONG HeapInformation;

    // 
    // Note: The HeapSetInformation function is available on Windows 2000 with SP4
    // only if hotfix KB 816542 is installed. To run this example on Windows 2000,
    // use GetProcAddress to get a pointer to the function if available.
    //

    //
    // Enable heap terminate-on-corruption. 
    // A correct application can continue to run even if this call fails, 
    // so it is safe to ignore the return value and call the function as follows:
    // (void)HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
    // If the application requires heap terminate-on-corruption to be enabled, 
    // check the return value and exit on failure as shown in this example.
    //
    bResult = HeapSetInformation(NULL,
                                 HeapEnableTerminationOnCorruption,
                                 NULL,
                                 0);

    if (bResult != FALSE) {
        _tprintf(TEXT("Heap terminate-on-corruption has been enabled.\n"));
    }
    else {
        _tprintf(TEXT("Failed to enable heap terminate-on-corruption with LastError %d.\n"),
                 GetLastError());
        return 1;
    }

    //
    // Create a new heap with default parameters.
    //
    hHeap = HeapCreate(0, 0, 0);
    if (hHeap == NULL) {
        _tprintf(TEXT("Failed to create a new heap with LastError %d.\n"),
                 GetLastError());
        return 1;
    }

    //
    // Enable the low-fragmenation heap (LFH). Starting with Windows Vista, 
    // the LFH is enabled by default but this call does not cause an error.
    //
    HeapInformation = HEAP_LFH;
    bResult = HeapSetInformation(hHeap,
                                 HeapCompatibilityInformation,
                                 &HeapInformation,
                                 sizeof(HeapInformation));
    if (bResult != FALSE) {
        _tprintf(TEXT("The low-fragmentation heap has been enabled.\n"));
    }
    else {
        _tprintf(TEXT("Failed to enable the low-fragmentation heap with LastError %d.\n"),
                 GetLastError());
        return 1;
    }

    return 0;
}