___
> From: users on behalf of Fisher (US), Mark
> S via users
> Sent: Monday, December 6, 2021 3:45 PM
> To: Joachim Protze; Open MPI Users
> Cc: Fisher (US), Mark S
> Subject: Re: [OMPI users] stdout scrambled in file
>
> This usual
m: users on behalf of Fisher (US), Mark S
via users
Sent: Monday, December 6, 2021 3:45 PM
To: Joachim Protze; Open MPI Users
Cc: Fisher (US), Mark S
Subject: Re: [OMPI users] stdout scrambled in file
This usually happens if we get a number of warning message from multiple
processes. Seems
Protze
Sent: Monday, December 06, 2021 11:12 AM
To: Fisher (US), Mark S ; Open MPI Users
Subject: Re: [OMPI users] stdout scrambled in file
I would assume, that the buffering mode is compiler/runtime specific. At
least for Intel compiler, the default seems to be/have been unbuffered
for
: Joachim Protze
Sent: Monday, December 6, 2021 9:24 AM
To: Open MPI Users
Cc: Fisher (US), Mark S
Subject: Re: [OMPI users] stdout scrambled in file
Hi Mark,
"[...] MPI makes neither requirements nor recommendations for the output
[...]" (MPI4.0, §2.9.1)
From my experience, an appli
Message-
From: Joachim Protze
Sent: Monday, December 6, 2021 9:24 AM
To: Open MPI Users
Cc: Fisher (US), Mark S
Subject: Re: [OMPI users] stdout scrambled in file
Hi Mark,
"[...] MPI makes neither requirements nor recommendations for the output
[...]" (MPI4.0, §2.9.1)
From my
Hi Mark,
"[...] MPI makes neither requirements nor recommendations for the output
[...]" (MPI4.0, §2.9.1)
From my experience, an application can avoid such scrambling (still no
guarantee), if the output of lines is written atomically. C++ streams
are worst for concurrent output, as every str
5, 2021 2:48 PM
To: Open MPI Users
Cc: Ralph Castain
Subject: [EXTERNAL] Re: [OMPI users] stdout scrambled in file
EXT email: be mindful of links/attachments.
There are several output-controlling options - e.g., you could redirect the
output from each process to its own file or directory
There are several output-controlling options - e.g., you could redirect the
output from each process to its own file or directory.
However, it makes little sense to me for someone to write convergence data into
a file and then parse it. Typically, convergence data results from all procs
reachin
Hi Mark
Back in the days I liked the mpirun/mpiexec *--tag-output *option.
Jeff: Does it still exist?
It may not prevent 100% the splitting of output lines,
but tagging the lines with the process rank helps.
You can grep the stdout log for the rank that you want,
which helps a lot when several pro
FWIW: Open MPI 4.1.2 has been released -- you can probably stop using an RC
release.
I think you're probably running into an issue that is just a fact of life.
Especially when there's a lot of output simultaneously from multiple MPI
processes (potentially on different nodes), the stdout/stderr
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