Intel Compiler 2016

The Intel compiler is available as a module and is available in different versions. To find out which versions are installed you can use the command

 module av icc

which currently shows

 -------------------- /cm/shared/uniol/modulefiles/COMPILER ---------------------
 icc/2016.3.210

This output depends on the currently loaded environment. If you change to the newer environment, the output will differ:

module load hpc-env/6.4   # change the environment
module av icc

---

/cm/shared/uniol/modules/8.3/compiler -------------------

  icc/2019.5.281

---

/cm/shared/uniol/modules/8.3/mpi ---------------------

  impi/2019.6.166-iccifort-2019b

---

/cm/shared/uniol/modules/8.3/toolchain ------------------

  iccifort/2019b

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

 module load icc/2019.5.281

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 vectorizing 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.

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