[Trilinos-Users] Not enough space to get a matrix row

[Eric Marttila]

Mike,
I had not run valgrind on this before.  I just did that and it did not flag any 
memory issues.  (I suppose there still could be some mem issues in there that 
valgrind isn't able to detect).
Thanks.
--Eric

On Friday, January 18, 2013 04:58:47 pm Heroux, Mike wrote:
> Eric,
> 
> Just a quick thought: Have you tried running this through a memory checker
> such as valgrind?  This kind of symptom suggests a memory error of some
> kind.
> 
> Mike
> 
> On 1/18/13 10:55 AM, "Eric Marttila" <eric.marttila at thermoanalytics.com>
> 
> wrote:
> >Dear all,
> >
> >I've been using ML with AztecOO to solve linear systems and they have
> >worked
> >very well for many of my cases.  However, I've run into an error in ML
> >with a
> >matrix that is sparse, but not quite as sparse as those that I've used
> >previously.
> >
> >The error I get is:
> >
> >"Not enough space to get a matrix row. A row length of
> >380444954 was not sufficient"
> >
> >I've been able to reproduce this with a fairly small matrix - it has
> >about
> >96,000 rows and 669,000 non-zero values so on average about 7 non-zeros
> >per
> >row.  It is unclear to me why ML is trying to get a matrix row with a
> >size of
> >~380 million given that my original matrix size is only 96,000.
> >
> >Does anyone have thoughts on this?  I'm not sure whether this might be a
> >bug
> >in ML, or if I'm trying to use a matrix that isn't compatible with ML.
> >
> >Thank you.
> >--Eric
> >
> >p.s.  I've attached a short main program that I created to reproduce the
> >behavior.  It uses my matrix in matrix market format - I'd be happy to
> >send
> >the matrix file to anyone that is interested.  It is several Mbytes when
> >compressed so I wasn't sure if I should attach that file when sending to
> >this
> >list.  I've also attached the call stack from when the error occured.

-- 
Eric A. Marttila
ThermoAnalytics, Inc.
23440 Airpark Blvd.
Calumet, MI 49913

email: Eric.Marttila at ThermoAnalytics.com
phone: 810-636-2443
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