Re: JAMA performance vs C++ performance?

[Roldan Pozo <pozo@cam.nist.gov>]

On PC platforms, Java can get quite close and even outperform
optimized C.  (The difference is due mainly to compiler implementations.)
See SciMark (www.math.nist.gov/scimark), which compares performance
results of common computational kernels in Java and C on various platforms.
Also, there was an article in the March/April issue of "Computing in
Science and Engineering" magazine (Vol. 3, No. 2, pp 18-24) that discussed 
Java performance for numerical computing.

--Roldan

Paul Siegmann wrote:
> 
> Hi all,
> 
> Currently we have a custom build java application that uses an also custom
> build C++ library.
> The C++ library handles lots of vector <-> vector distance calculations.
> It uses a fortran library for the calculation of EigenValues.
> Now my hands are itching to rewrite the thing in java, but we really like
> the performance of our C++ library.
> The only question we need answered before we can start on the porting is:
> What kind of performance can we expect from a JAMA-based java implementation
> compared to the C++ version?
> 
> regards,
>                        Paul Siegmann