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litex-hub / linux-on-litex-vexriscv

Linux on LiteX-VexRiscv
BSD 2-Clause "Simplified" License
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mpirun ./executable gives this message #306

Closed amr-25 closed 1 year ago

amr-25 commented 1 year ago

Hi, I am trying to run MPI applications on the SMP. I have built buildroot using the BR2_PACKAGE_OPENMPI=y package since mpi.h was not recognised. It compiles fine without mpi wrapper by manually providng the include and library paths, flags. for example: ./riscv32-linux-gcc -march=rv32ima -mabi=ilp32 -I /home/user/Litex/buildroot/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/include/openmpi/ hello.c -Wl,-rpath -Wl,--enable-new-dtags -L /home/user/Litex/buildroot/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/lib/openmpi/ -lmpi -lopen-rte -lopen-pal -lm -o hello

However on transfering to the board with rootfs.cpio, and running it either by ./hello or through mpirun ./hello, it gives an error: [err] opal_libevent2022_evsig_init: Address family not supported by protocol.

I googled the error and it did not seem mpi related. Does anyone faced this issue or are aware of what this means?

Thank you

jeremy-heath commented 1 year ago

Not really a linux-on-litex-vexriscv issue. It is an openmpi issue. Try 1: Try anything Let's suppose, this line defines your server name: 127.0.1.1 server-name Change it as follows: 127.0.1.1 server-name.localhost server-name

2: Continuing on our investigation, we found that the alternate way of disabling IPv6 support is to pass ipv6.disable=1

as a bootarg to the Linux kernel

amr-25 commented 1 year ago

Thank you for the response. I did not understand the first one, how to do it.

Regarding 1, The hosts listed in /etc/hosts are: 127.0.0.1 localhost 127.0.1.1 buildroot

and /etc/hostname is: buildroot

I tried changing the contents of /etc/hosts to 127.0.0.1 localhost 127.0.1.1 buildroot.localhost buildroot

I also tried the second, by using these commands to disable the ipv6. sysctl -w net.ipv6.conf.all.disable_ipv6=1 sysctl -w net.ipv6.conf.default.disable_ipv6=1

But I still got the same error. Am I doing something wrong?

jeremy-heath commented 1 year ago

Really recommend a more appropriate forum: open-mpi.org/community/lists/ompi.php

Try. Make linux-menuconfig [*] Unix domain sockets

enjoy-digital commented 1 year ago

As suggested by @jeremy-heath, the discussion seems related to OpenMPI package and probably not directly related to the current project. This could probably be discussed in OpenMPI forums.