Question

我有一个使用OpenMPI并在Windows和Linux上启动它的应用程序。 Windows版本运行正常，但是在Linux上运行会导致内存分配错误。某些应用程序参数会出现问题，需要更多计算。为了消除内存泄漏，我使用Valgrind检查了Linux版本应用程序并得到了一些output。毕竟，我试图搜索有关输出的信息，并在堆栈溢出和GitHub上找到一些帖子（没有足够的声誉来附加链接）。毕竟，我将openMPI更新为2.0.2并再次检查应用程序。新output。是OpenMPI中的内存泄漏还是我做错了什么？

一段输出：

==16210== 4 bytes in 1 blocks are definitely lost in loss record 5 of 327
==16210==    at 0x4C2DBB6: malloc (vg_replace_malloc.c:299)
==16210==    by 0x5657A59: strdup (strdup.c:42)
==16210==    by 0x51128E6: opal_basename (in /home/vshmelev/OMPI_2.0.2/lib/libopen-pal.so.20.2.0)
==16210==    by 0x7DDECA9: ???
==16210==    by 0x7DDEDD4: ???
==16210==    by 0x6FBFF84: ???
==16210==    by 0x4E4EA9E: orte_init (in /home/vshmelev/OMPI_2.0.2/lib/libopen-rte.so.20.1.0)
==16210==    by 0x4041FD: orterun (orterun.c:818)
==16210==    by 0x4034E5: main (main.c:13)

OpenMPI版本：打开MPI：2.0.2
Valgrind版本：valgrind-3.12.0
虚拟mashine特性：Ubuntu 16.04 LTS x64

如果使用MPICH，Valgrind输出为：

==87863== HEAP SUMMARY:
==87863==     in use at exit: 131,120 bytes in 2 blocks
==87863==   total heap usage: 2,577 allocs, 2,575 frees, 279,908 bytes allocated
==87863== 
==87863== 131,120 bytes in 2 blocks are still reachable in loss record 1 of 1
==87863==    at 0x4C2DBB6: malloc (vg_replace_malloc.c:299)
==87863==    by 0x425803: alloc_fwd_hash (sock.c:332)
==87863==    by 0x425803: HYDU_sock_forward_stdio (sock.c:376)
==87863==    by 0x432A99: HYDT_bscu_stdio_cb (bscu_cb.c:19)
==87863==    by 0x42D9BF: HYDT_dmxu_poll_wait_for_event (demux_poll.c:75)
==87863==    by 0x42889F: HYDT_bscu_wait_for_completion (bscu_wait.c:60)
==87863==    by 0x42863C: HYDT_bsci_wait_for_completion (bsci_wait.c:21)
==87863==    by 0x40B123: HYD_pmci_wait_for_completion (pmiserv_pmci.c:217)
==87863==    by 0x4035C5: main (mpiexec.c:343)
==87863== 
==87863== LEAK SUMMARY:
==87863==    definitely lost: 0 bytes in 0 blocks
==87863==    indirectly lost: 0 bytes in 0 blocks
==87863==      possibly lost: 0 bytes in 0 blocks
==87863==    still reachable: 131,120 bytes in 2 blocks
==87863==         suppressed: 0 bytes in 0 blocks
==87863== 
==87863== For counts of detected and suppressed errors, rerun with: -v
==87863== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

Answer 1

术语“肯定丢失”意味着你的程序在第13行的主要功能（据我在输出中看到的）直接泄漏内存或调用一些导致内存泄漏的其他功能（orterun）。你必须修复这些泄漏或提供更多的代码。

在所有事情之前先看看here。

Answer 2

这些输出指向MPI库中的某些内存泄漏，而不是您的应用程序代码。你可以放心地忽略它们。

更具体地说，这些泄漏来自发射器。 ORTE是OpenMPI的运行时环境，负责启动和管理MPI进程。 Hydra是MPICH的启动器和进程管理器。

有人能用open mpi解释这个valgrind输出吗？

2 个答案: