For developing code on Terra we recommend using the intel software stack (which is often referenced as a "toolchain" here at HPRC), which includes the Intel compilers (icc/icpc/ifort), the Intel Math Kernel Library (MKL), and the Intel MPI. A note for Terra Users: the Intel compilers are the only compilers able to compile programs for the Phi co-processors.
We highly recommend users select a particular toolchain and stick with modules that use it. At present, we support the following toolchains:
- intel - described above
- iomkl - which substitutes OpenMPI for Intel's MPI
- foss - which is entirely Free and Open-Source Software (GCC/OpenMPI/BLAS/LAPACK/etc)
Detailed information about each of the currently supported toolchain releases can be found on our Toolchains page.
Toolchains, like software packages on our clusters, are organized with the Modules System. You can load a toolchain with the following command:
[ netID@cluser ~]$ module load [toolchain Name]
Important Note: Do NOT mix modules from different toolchains. Remember to ALWAYS purge all modules when switching toolchains.
More information on using the Modules System can be found on our Modules System page.
Using the intel toolchain
After initializing the compiler environment, you can use the "man" command to obtain a complete list of the available compilation options for the language you plan to use. The following three commands will provide information on the C, C++, and Fortran compilers, respectively.
[ netID@cluster ~]$ man icc [ netID@cluster ~]$ man icpc [ netID@cluster ~]$ man ifort
Each compiler requires appropriate file name extensions. These extensions are meant to identify files with different programming language contents, thereby enabling the compiler script to hand these files to the appropriate compiling subsystem: preprocessor, compiler, linker, etc. See table below for valid extensions for each language.
|.c||icc||C source code passed to the compiler.|
|.C, .CC, .cc, .cpp, .cxx||icpc||C++ source code passed to the compiler.|
|.f, .for, .ftn||ifort||Fixed form Fortran source code passd to the compiler.|
|.fpp||ifort||Fortran fixed form source code that can be preprocessed by the Intel Fortran preprocessor fpp.|
|.f90||ifort||Free form Fortran 90/95 source code passed to the compiler.|
|.F||ifort||Fortran fixed form source code, will be passed to preprocessor (fpp) and then passed to the Fortran compiler.|
|.o||icc/icpc/ifort||Compiled object file--generated with the -c option--passed to the linker.|
Note: The icpc command ("C++" compiler) uses the same compiler options as the icc ("C" compiler) command. Invoking the compiler using icpc compiles '.c', and '.i' files as C++. Invoking the compiler using icc compiles '.c' and '.i' files as C. Using icpc always links in C++ libraries. Using icc only links in C++ libraries if C++ source is provided on the command line.