NEMO3D

This is a summary of the performance evaluation of NEMO3D. Our initial focus was on finding hot spots in the code where most of the computational work is being done.

Instrumentation overhead

Measured NEMO

Run Type	Runtime (seconds)	Overhead %
Uninstrumented runtime	372	NA
Routine+loops instrumentation	392	5.4

We have found two loops in the source file "h_cvectr_multi.c" that together account for about 90% (with 16 processors) of the runtime of the NEMO3D application. Loop 1 is