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 _______________________________________________ cellml-discussion mailing list [email protected] http://www.cellml.org/mailman/listinfo/cellml-discussion
