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ifort [ options ] program.f (support Fortran 77 90 95)
icc [ options ] program.c (support C/C++)
icpc [ options ] program.cpp (support C++)

Optimization Options

Option	Description
-O0	Disable all optimizations. Using for debugging,,, etc.
-O1	Affects code size and locality. Disables specific optimizations.
-O2	Default optimizations. Same as -O. Enables optimizations for speed, including global code scheduling, software pipelining, predication.
-O3	Aggressive optimizations for maximum speed (, but does not guarantee higher performance). Optimization including data prefetching, scalar replacement, loop transformations.
-fast	Enhances speed across the entire program. Same as -O3, ipo, and -static

OpenMP
Option	Description
-qopenmp	Enables the parallelizer to generate multithreaded code based on OpenMP directives

Automatic Parallelization
Option	Description
-parallel	Enables the auto-parallelizer
-par-report[0\|1\|2\|3]	Controls the auto-parallelizer diagnostic messages. report0 : no diagnostics report1 : diagnostics indicating loops successfully auto-parallelized (default) report2 : diagnostics indicating all loops report3 : detail diagnostics
-par-threshold[n]	0 : loops get auto-parallelized always, regardless of computation work volume. 100 : loops get auto-parallelized when performance gains are predicted based on the compiler analysis data. (default)

MPI
Option	Description
-lmpi	link MPI program
* This option has to specify the end of all option． ex: % icc –O3 -o prog.out prog.c –lmpi