After rereading the manpage for the umpteenth time I agree with Eugene
that the information provided on cartofile is next to useless. Ok, so
you describe what your node looks like but what does mpirun or libmpi do
with that information? Other than the option to provide the cartofile
it isn't obvious how a user or libmpi uses this information.
I've looked on the faq and wiki and have not found anything yet on how
one "current" uses cartofile.
--td
Eugene Loh wrote:
This e-mail was on the users alias... see
http://www.open-mpi.org/community/lists/users/2009/09/10710.php
There wasn't much response, so let me ask another question. How about
if we remove the cartofile section from the DESCRIPTION section of the
OMPI mpirun man page? It's a lot of text that illustrates how to
create a cartofile without saying anything about why one would want to
go to the trouble. What does this impact? What does it change?
What's the motivation for doing this stuff? What's this stuff good for?
Another alternative could be to move the cartofile description to a
FAQ page.
The mpirun man page is rather long and I was thinking that if we could
remove some "low impact" stuff out, we could improve the overall
signal-to-noise ratio of the page.
In any case, I personally would like to know what cartofiles are good for.
Eugene Loh wrote:
Thank you, but I don't understand who is consuming this information
for what. E.g., the mpirun man page describes the carto file, but
doesn't give users any indication whether they should be worrying
about this.
Lenny Verkhovsky wrote:
Hi Eugene,
carto file is a file with a staic graph topology of your node.
in the opal/mca/carto/file/carto_file.h you can see example.
( yes I know that , it should be help/man list :) )
Basically it describes a map of your node and inside interconnection.
Hopefully it will be discovered automatically someday,
but for now you can describe your node manually.
Best regards
Lenny.
On Thu, Sep 17, 2009 at 12:38 AM, Eugene Loh <eugene....@sun.com
<mailto:eugene....@sun.com>> wrote:
I feel like I should know, but what's a cartofile? I guess you
supply "topological" information about a host, but I can't tell
how this information is used by, say, mpirun.
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