MPI 内存泄漏 [英] MPI memory leak
问题描述
我正在编写一些使用 MPI 的代码，并且在使用 valgrind 运行它时我一直注意到一些内存泄漏.在试图确定问题出在哪里时，我最终得到了这个简单(而且完全没用)的 main:
I am writing some code that uses MPI and I was keeping noticing some memory leaks when running it with valgrind. While trying to identify where the problem was, I ended up with this simple (and totally useless) main:
#include "/usr/include/mpi/mpi.h"
int main(int argc,char** argv)
{
MPI_Init(&argc, &argv);
MPI_Finalize();
return 0;
}
如您所见，此代码不会执行任何操作，也不应该产生任何问题.但是，当我使用 valgrind 运行代码时(在串行和并行情况下)，我得到以下摘要:
As you can see, this code doesn't do anything and shouldn't create any problem. However, when I run the code with valgrind (both in the serial and parallel case), I get the following summary:
==28271== 堆摘要:
==28271== HEAP SUMMARY:
==28271== 在退出时使用:2,745 个块中有 190,826 字节
==28271== in use at exit: 190,826 bytes in 2,745 blocks
==28271== 总堆使用量:11,214 次分配，8,469 次释放，16,487,977 字节分配
==28271== total heap usage: 11,214 allocs, 8,469 frees, 16,487,977 bytes allocated
==28271==
==28271== 泄漏摘要:
==28271== LEAK SUMMARY:
==28271== 肯定丢失了:55 个块中有 5,950 个字节
==28271== definitely lost: 5,950 bytes in 55 blocks
==28271== 间接丢失:32 个块中 3,562 个字节
==28271== indirectly lost: 3,562 bytes in 32 blocks
==28271== 可能丢失:0 个块中的 0 个字节
==28271== possibly lost: 0 bytes in 0 blocks
==28271== 仍然可达:2,658 个块中有 181,314 个字节
==28271== still reachable: 181,314 bytes in 2,658 blocks
==28271== 被抑制:0 个块中的 0 个字节
==28271== suppressed: 0 bytes in 0 blocks
我不明白为什么会有这些泄漏.也许只是我无法读取 valgrind 输出或正确使用 MPI 初始化/终结...
I don't understand why there are these leaks. Maybe it's just me not able to read the valgrind output or to use MPI initialization/finalization correctly...
我在 64 位架构的 ubuntu 下使用 OMPI 1.4.1-3，如果这有帮助的话.
I am using OMPI 1.4.1-3 under ubuntu on a 64 bit architecture, if this can help.
非常感谢您的时间！
推荐答案
你没有做错任何事.valgrind 的 Memcheck 误报很常见，你能做的最好的事情就是抑制它们.
You're not doing anything wrong. Memcheck false positives with valgrind are common, the best you can do is suppress them.
本页详细介绍了这些误报.接近尾声的引用:
This page of the manual speaks more about these false positives. A quote near the end:
包装器应降低 Memcheck 在 MPI 上的误报率应用程序.因为包装是在 MPI 接口完成的，所以有仍然可能会在 MPI 中报告大量错误接口下面的实现.你能做的最好的事情就是尝试压制他们.
The wrappers should reduce Memcheck's false-error rate on MPI applications. Because the wrapping is done at the MPI interface, there will still potentially be a large number of errors reported in the MPI implementation below the interface. The best you can do is try to suppress them.
这篇关于MPI 内存泄漏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
