CyEnce: Recommended compiler options

Use of the Intel Fortran, C, and C++ compilers (icc, icpc, ifort) is recommended for all applications. Detailed information about these compilers can be found by issuing 'man icc' and 'man ifort'.

Recommended compiler options for High Performance

The default compiler options include such optimizations as -O2, -m64, -msse2. However, the use of the following compiler option will usually provide better performance of your program.

   -fast  

This option in its turn sets the following options:

 -ipo, -O3, -no-prec-div, -static, -fp-model fast=2, and -xHost
The -xHost compiler option tells the compiler to generate instructions for the highest instruction set available on the compilation host processor.

The -ipo option turns on inter-procedural optimization. To get the full benefit of this optimization, you must compile all program files at the same time. For example,

   mpiifort -fast -msse3 program1.f90 program2.f90 program3.f90

Recommended compiler options for Debugging

The '-check all' ifort compiler option turns on checks for various conditions at run time. Intel C/C++ compiler also supports a number of -check* options. For details issue "man icc".

The -w3 Intel C/C++ compiler option enables diagnostics for remarks, warnings, and errors. Additional warnings are also enabled. The -warn ifort option enables all warning messages except errors and stderrors.