Different users with different needs.

{

The traditional library users, who make 500 requests/day to netlib and keep NAG and IMSL in business, have the following priorities:

Easy interface with hidden details

Reliability; the code should fail as rarely as possible

Speed

The HPCC community, on the other hand, which wants to solve the largest, hardest problems as quickly as possible, seems to want

Speed

Access to internal details to tune data structures to the application

Algorithms which are fast for the particular application even if not reliable as general methods

Differing priorities

Different approaches to algorithms and software.

Slide 77 of SIAM Tutorial, Jack Dongarra UT/ORNL. (Updated 01/31/95)