MVAPICH2缓冲区别名 [英] Mvapich2 buffer aliasing

问题描述

我用MVAPICH2启动了一个MPI程序，并收到此错误:

I am launched an MPI program with MVAPICH2 and got this error:

Fatal error in PMPI_Gather:
Invalid buffer pointer, error stack:
PMPI_Gather(923): MPI_Gather() failed
PMPI_Gather(857): Buffers must not be aliased

我认为有两种解决方法:

There are two ways I think I could solve this:

1. 重写我的MPI程序(使用不同的缓冲区)
2. 禁用检查缓冲区别名

有人知道我该如何使用MVAPICH2吗?一些编译器选项，参数，环境变量等?

Do someone know how I could do this with MVAPICH2? Some compiler option, parameter, environmental variable, etc?

类似于MV2_NO_BUFFER_ALIAS_CHECK的东西，但是它不起作用.

Something like MV2_NO_BUFFER_ALIAS_CHECK, but it does not work.

推荐答案

您正在做的是不正确的程序，应该重写代码以使用单独的缓冲区

What you're doing is an incorrect program and you should rewrite your code to use separate buffers

或者，如果要使用与MPI_GATHER的输入和输出值相同的缓冲区，则可以使用MPI_IN_PLACE.没有看到您的代码，我无法告诉您如何做到这一点.您可以查看有关MPI_GATHER的某些文档，并详细了解MPI_IN_PLACE的工作原理看看是否能解决您的问题.

Alternatively, you might be able to use MPI_IN_PLACE if you want to use the same buffer as both the input and output values of your MPI_GATHER. Without seeing your code, I can't tell you how you could do that. You can check out some documentation about MPI_GATHER and read more about how MPI_IN_PLACE works and see if that solves your problem.

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