This quick start demonstrates how to implement a Fortran/C program on HCC supercomputers. The sample codes and submit scripts can be downloaded from serial_dir.zip.
Connect to a HCC cluster and make a subdirectory
called serial_dir under your $WORK directory.
$ cd $WORK
$ mkdir serial_dirIn the subdirectory serial_dir, save all the relevant Fortran/C codes. Here we include two demo
programs, demo_f_serial.f90 and demo_c_serial.c, that compute the sum from 1 to 20.
The compiling of a Fortran/C++ code to executable is usually done behind
the scene in a Graphical User Interface (GUI) environment, such as
Microsoft Visual Studio. In a HCC cluster, the compiling is done
explicitly by first loading a choice compiler and then executing the
corresponding compiling command. Here we will use the GNU Complier
Collection, gcc, for demonstration. Other available compilers such as
intel or pgi can be looked up using the command
line module avail. Before compiling the code, make sure there is no
dependency on any numerical library in the code. If invoking a numerical
library is necessary, contact a HCC specialist
(hcc-support@unl.edu) to
discuss implementation options.
$ module load compiler/gcc/8.2
$ gfortran demo_f_serial.f90 -o demo_f_serial.x
$ gcc demo_c_serial.c -o demo_c_serial.xThe above commends load the gcc complier and use the compiling
commands gfortran or gcc to compile the codes to.x files
(executables).
Create a submit script to request one core (default) and 1-min run time on the supercomputer. The name of the main program enters at the last line.
The job can be submitted through the command sbatch. The job status
can be monitored by entering squeue with the -u option.
$ sbatch submit_f.serial
$ sbatch submit_c.serial
$ squeue -u <username>Replace <username> with your HCC username.
The sum from 1 to 20 is computed and printed to the .out files.