Identifying Performance Bottlenecks In A Radiative Transfer
Application
Author(s)
S. Stephany, R. V. Correa, C. L. Mendes and A. J. Preto
Abstract
Identifying performance bottlenecks in a
radiative transfer application
S. Stephanyi, R. V. Correa", C. L. Mendes* & A. J. Preto*
'Applied Computing Lab (LAC)
^Baloon Facility (SLB), Brazilian Institute for Space Research (INPE),
Abstract
The Hydrolight software is a well known radiative transfer solver, written
in Fortran 77, intended for hydrologic optics problems. It was developed
by C. D. Mobley and it is based on an invariant imbedding methodology
that yields a system of non-linear ordinary differential equations, the Riccati
equations, which are solved by routines that implement numerical methods.
This work proposes an innovative strategy for identifying performance
bottlenecks and optimising a code using both standard profiling tools and
accessing specific cpu registers and a time counter. The execution profile in
a RISC worst at ion shows that most of the processing time is spent in solv-
ing Riccati equations, what is accomplished by a Runge-Kutta algorithm.
The time-
Keywords
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