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David Nickerson wrote:
> Hi all,
>
> From today's meeting minutes the following priorities were set for the
> development of pcenv:
>
> 1. Make an official release of what we have now, instead of just
> snapshot releases.
> 2. Try to improve integration performance, by using CVODE from the
> SUNDIALS project.
> 3. Investigate the possibility of getting Mac OSX support - Intel
> only to start with.
> 4. Get editing support for MathML and the CellML structure working.
> 5. Add CellML Metadata support to the backend, and editing support
> for this to the UI.
>
>
> I'm just wondering if 2 is more important than 1?
>
> From feedback so far, the performance of pcenv is very poor compared to
> other tools. There is currently (to my knowledge) no firm idea if this
> is due to the underlying technology being used by pcenv, or simply due
> to the numerical integrators being used not being as good as what most
> people are currently using.
>
Please refer to my messages on the 27th of this month, where I discuss
the results of profiling it in callgrind.

The major performance bottleneck is the the evaluation of the Jacobian
function (I use the standard O(n^2) method for generating a dense
Jacobian in an array, and most of the time is spent evaluating the
variables). Although COR is closed source and so I cannot see exactly
what it is doing. Given that COR apparently isn't doing any optimisation
here, it must be taking a comparable amount of time per Jacobian
computation, so the difference must be in the number of calls to compute
the Jacobian.
> Seems it would be good to address this question now, because if using
> something like CVODE still results in the same poor performance then I
> think some serious thinking needs to be done about the underlying
> technology before an official release of pcenv should be made.
I understand that you already have CVODE working with CCGS, so perhaps
you can give some indication of how well CCGS generated code works with
CVODE?

Best regards,
Andrew

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• [cellml-discussion] pcenv development priorities, David Nickerson, 10/30/2006
  • [cellml-discussion] pcenv development priorities, Andrew Miller, 10/30/2006
    • [cellml-discussion] pcenv development priorities, David Nickerson, 10/30/2006
      • [cellml-discussion] pcenv development priorities, Alan Garny, 10/30/2006
    • [cellml-discussion] pcenv development priorities, Poul Nielsen, 10/30/2006
      • [cellml-discussion] pcenv development priorities, Andrew Miller, 10/30/2006
    • [cellml-discussion] pcenv development priorities, David Nickerson, 10/30/2006
      • [cellml-discussion] pcenv development priorities, Alan Garny, 10/30/2006
        • [cellml-discussion] pcenv development priorities, David Nickerson, 10/30/2006
          • [cellml-discussion] pcenv development priorities, Alan Garny, 10/31/2006
          • [cellml-discussion] pcenv development priorities, Andrew Miller, 10/31/2006
            • [cellml-discussion] pcenv development priorities, David Nickerson, 10/31/2006

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