Could SELinux or AppArmor be active by default for a new install and
be causing this problem?
Prentice
On 10/21/20 12:22 PM, Jorge SILVA via users wrote:
Hello Gus,
Thank you for your answer.. Unfortunately my problem is much more
basic. I didn't try to run the program in both computers , but just
to run something in one computer. I just installed the new OS an
openmpi in two different computers, in the standard way, with the same
result.
For example:
In kubuntu20.4.1 LTS with openmpi 4.0.3-0ubuntu
jorge@gcp26:~/MPIRUN$ cat hello.f90
print*,"Hello World!"
end
jorge@gcp26:~/MPIRUN$ mpif90 hello.f90 -o hello
jorge@gcp26:~/MPIRUN$ ./hello
Hello World!
jorge@gcp26:~/MPIRUN$ mpirun -np 1 hello <---here the program hangs
with no output
^C^Cjorge@gcp26:~/MPIRUN$
The mpirun task sleeps with no output, and only twice ctrl-C ends the
execution :
jorge 5540 0.1 0.0 44768 8472 pts/8 S+ 17:54 0:00
mpirun -np 1 hello
In kubuntu 18.04.5 LTS with openmpi 2.1.1, of course, the same program
gives
jorge@gcp30:~/MPIRUN$ cat hello.f90
print*, "Hello World!"
END
jorge@gcp30:~/MPIRUN$ mpif90 hello.f90 -o hello
jorge@gcp30:~/MPIRUN$ ./hello
Hello World!
jorge@gcp30:~/MPIRUN$ mpirun -np 1 hello
Hello World
jorge@gcp30:~/MPIRUN$
Even just typing mpirun hangs without the usual error message.
Are there any changes between the two versions of openmpi that I
miss? Some package lacking to mpirun ?
Thank you again for your help
Jorge
Le 21/10/2020 à 00:20, Gus Correa a écrit :
Hi Jorge
You may have an active firewall protecting either computer or both,
and preventing mpirun to start the connection.
Your /etc/hosts file may also not have the computer IP addresses.
You may also want to try the --hostfile option.
Likewise, the --verbose option may also help diagnose the problem.
It would help if you send the mpirun command line, the hostfile (if any),
error message if any, etc.
These FAQs may help diagnose and solve the problem:
https://www.open-mpi.org/faq/?category=running#diagnose-multi-host-problems
https://www.open-mpi.org/faq/?category=running#mpirun-hostfile
https://www.open-mpi.org/faq/?category=running
I hope this helps,
Gus Correa
On Tue, Oct 20, 2020 at 4:47 PM Jorge SILVA via users
<users@lists.open-mpi.org <mailto:users@lists.open-mpi.org>> wrote:
Hello,
I installed kubuntu20.4.1 with openmpi 4.0.3-0ubuntu in two
different
computers in the standard way. Compiling with mpif90 works, but
mpirun
hangs with no output in both systems. Even mpirun command without
parameters hangs and only twice ctrl-C typing can end the sleeping
program. Only the command
mpirun --help
gives the usual output.
Seems that is something related to the terminal output, but the
command
worked well for Kubuntu 18.04. Is there a way to debug or fix this
problem (without re-compiling from sources, etc)? Is it a known
problem?
Thanks,
Jorge
