Using MPI in MEX function

2016 9 29
1 个回答
回答已采纳
更新时间：2017 10 28
5 次查看（30 天）

0 个投票

I am trying to run parallel code which is designed in the following way: I launch multiple MPI processes where only one of them (master) calls matlab script which further calls mex function in which I want to set-up MPI communication with the rest of the processes launched at the beginning. However, I am getting a MPI runtime error:
It looks like MPI_INIT failed for some reason; your parallel process is
likely to abort. There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or environment
problems. This failure appears to be an internal failure; here's some
additional information (which may only be relevant to an Open MPI
developer):
ompi_mpi_init: ompi_rte_init failed
--> Returned "(null)" (-43) instead of "Success" (0)
Does anybody have experience with similar approach? Is it possible to use MEX function and MPI together? I am using openmpi-2.0.0 and R2014b
The Matlab/C/Mex code is here: https://github.com/goghino/matlabMpiC

请先登录，再回答此问题。

 采纳的回答

Juraj
Juraj 2016-10-12
编辑：Walter Roberson 2017-10-28

0 个投票

THIS APPROACH DOES NOT WORK!!!!!
https://www.mail-archive.com/users@lists.open-mpi.org//msg30088.html
The blocker is that a child cannot call MPI_Init() if its parent already called MPI_Init()
Fortunatly, there are some options (which I have not tried):-)
1) MPI_Comm_spawn matlab
master can MPI_Comm_spawn() matlab, and then matlab can merge the parent communicator, and communicate to master and slaves
(Merging communicators: https://stackoverflow.com/questions/24806782/mpi-merge-multiple-intercoms-into-a-single-intracomm

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Performance and Memory 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by