bugGNU Octave - Bugs: bug #55905, ode15{i,s} allocate enough memory...


bug #55905: ode15{i,s} allocate enough memory for a full jacobian when the provided jacobian is sparse

Submitted by:  Carlo de Falco <cdf>
Submitted on:  Wed 13 Mar 2019 08:32:38 AM UTC  
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Performance
Status:  In Progress Assigned to:  None
Originator Name:  Open/Closed:  Open
Release:  dev Operating System:  Any

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Fri 20 Sep 2019 06:48:45 PM UTC, comment #1: 

I fixed this bug following the suggestion in the
"FIXME comment". An hg patch file is attached.
Note, one implication of this fix is that SUNDIALS 4 (or greater)
is now required because the function, SUNSparseMatrix_Reallocate,
used in the fix is not available in older versions of SUNDIALS.

(file #47555)

Bill Greene <billgreene>
Wed 13 Mar 2019 08:32:38 AM UTC, original submission:  

The memory allocation for the sparse jacobian
is done in an overly safe way here

The memory is allocated as if the jacobian was full.

It would be more memory efficient to check the actual size of the needed memory before doing the allocation.

I have already added a FIXME comment in the code, I am posting this here as well in order not to forget.

Carlo de Falco <cdf>
Project Member


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Attach Files:

Attached Files
file #47555:  ode15.diff added by billgreene (2KiB - application/octet-stream)


Depends on the following items: None found

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-09-20 billgreene Attached File- => Added ode15.diff, #47555

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