Intel Compiler

The Intel Compilers are available as modules for 32bit (depricated) and 64-bit version. To see the available versions of the Intel Compilers type

 module av ics

which currently shows

 -------------------- /cm/shared/uniol/modulefiles/COMPILER ---------------------
 ics/2013_sp1.3.174/32 ics/2013_sp1.3.174/64

To load the module of your choice type e.g.

 module load ics/2013_sp1.3.174/64

The commands for the available languages are

Name	Description
icc	C compiler
icpc	C++ compiler
ifort	Fortran compiler

Compiler Flags

Here are some compiler flags which may increase the performance of your code

Flag	Description
-O2, -O3, -fast	Enable optimization to maximise speed. -O3 and -fast is more agressive.
-xHost	Enables the usage SIMD extensions of host which allows parallelization of floating point operations.
-fp-model MODEL	Defines the consistency level of floating point operations. Allowed MODEL are: fast, precise, strict, except
-[no-]prec-div, -[no-]prec-sqrt, -[no-]fast-transcendentals	Enables faster computations of divisions, square roots and transcendental functions with a reduced accruacy, respectively.

For more informations please have a look on the man pages.

Advantages

• usually best performance for C and Fortran code on Intel processors
• high performance with OpenMP
• high optimization done by compiler
• Fortran extension coarray implemented

Disadvantages

• performance of C++ code can be moderate
• relative slow compilation
• not free, only for Intel architecture available
• newest standards may missing
• sometimes too enthusiastic/aggressive in optimization

Intel Cluster Studio addons

Within the Intel Cluster Studio several tools and libraries for debugging, profiling and analyzing of program code are included:

• MKL (Math Kernel Library)
• VTune
• Intel Trace Analyzer
• Intel Thread Checker
• Intel Debugger (idb)
• Thread Building Blocks
• Intel(R) Advisor Command Line Tool