Yes. The --tag-output option will prepend [job,rank]<stdout> (or
stderr, whichever is appropriate) to each line. I don't insert a
colon, though I suppose that would easily be done for grep purposes.
I just finished implementing the --output-filename option that will
split the output from each rank into its own file. Completed the
timestamp option last night.
Almost have the --screen option done - it's a little trickier. :-)
Ralph
On Jan 26, 2009, at 11:56 AM, Douglas Guptill wrote:
Hello Ralph:
Please forgive if this has already been covered...
Have you considered prefixing each line of output from each process
with something like "process_number" and a colon?
That is what IBM's poe does. Separating the output is then easy:
cat file | grep 0: > file.0
cat file | grep 1: > file.1
etc.
In the meantime, I got around the problem by having each process open
its own file (instead of using stdout), and embedding the process
number in the file name.
Hope that helps,
Douglas.
On Sun, Jan 25, 2009 at 05:20:47AM -0700, Ralph Castain wrote:
For those of you following this thread:
I have been impressed by the various methods used to grab the output
from processes. Since this is clearly something of interest to a
broad
audience, I would like to try and make this easier to do by adding
some options to mpirun. Coming in 1.3.1 will be --tag-output, which
will automatically tag each line of output with the rank of the
process - this was already in the works, but obviously doesn't meet
the needs expressed here.
I have done some prelim work on a couple of options based on this
thread:
1. spawn a screen and redirect process output to it, with the ability
to request separate screens for each specified rank. Obviously,
specifying all ranks would be the equivalent of replacing "my_app" on
the mpirun cmd line with "xterm my_app". However, there are cases
where you only need to see the output from a subset of the ranks, and
that is the intent of this option.
2. redirect output of specified processes to files using the provided
filename appended with ".rank". You can do this for all ranks, or a
specified subset of them.
3. timestamp output
Is there anything else people would like to see?
It is also possible to write a dedicated app such as Jody described,
but that is outside my purview for now due to priorities. However, I
can provide technical advice to such an effort, so feel free to ask.
Ralph
On Jan 23, 2009, at 12:19 PM, Gijsbert Wiesenekker wrote:
jody wrote:
Hi
I have a small cluster consisting of 9 computers (8x2 CPUs, 1x4
CPUs).
I would like to be able to observe the output of the processes
separately during an mpirun.
What i currently do is to apply the mpirun to a shell script which
opens a xterm for each process,
which then starts the actual application.
This works, but is a bit complicated, e.g. finding the window
you're
interested in among 19 others.
So i was wondering is there a possibility to capture the processes'
outputs separately, so
i can make an application in which i can switch between the
different
processor outputs?
I could imagine that could be done by wrapper applications which
redirect the output over a TCP
socket to a server application.
But perhaps there is an easier way, or something like this alread
does exist?
Thank You
Jody
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For C I use a printf wrapper function that writes the output to a
logfile. I derive the name of the logfile from the mpi_id. It
prefixes the lines with a time-stamp, so you also get some basic
profile information. I can send you the source code if you like.
Regards,
Gijsbert
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FORTRAN?
The syntactically incorrect statement "DO 10 I = 1.10" will parse and
generate code creating a variable, DO10I, as follows: "DO10I =
1.10" If that
doesn't terrify you, it should.
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