lapack

Versions and Availability

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Module Names for lapack on smic
Machine Version Module Name
smic 3.4.2 lapack/3.4.2/INTEL-140-MVAPICH2-2.0

▶ Module FAQ?

The information here is applicable to LSU HPC and LONI systems.

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Shells

A user may choose between using /bin/bash and /bin/tcsh. Details about each shell follows.

/bin/bash

System resource file: /etc/profile

When one access the shell, the following user files are read in if they exist (in order):

  1. ~/.bash_profile (anything sent to STDOUT or STDERR will cause things like rsync to break)
  2. ~/.bashrc (interactive login only)
  3. ~/.profile

When a user logs out of an interactive session, the file ~/.bash_logout is executed if it exists.

The default value of the environmental variable, PATH, is set automatically using Modules. See below for more information.

/bin/tcsh

The file ~/.cshrc is used to customize the user's environment if his login shell is /bin/tcsh.

Modules

Modules is a utility which helps users manage the complex business of setting up their shell environment in the face of potentially conflicting application versions and libraries.

Default Setup

When a user logs in, the system looks for a file named .modules in their home directory. This file contains module commands to set up the initial shell environment.

Viewing Available Modules

The command

$ module avail

displays a list of all the modules available. The list will look something like:

--- some stuff deleted ---
velvet/1.2.10/INTEL-14.0.2
vmatch/2.2.2

---------------- /usr/local/packages/Modules/modulefiles/admin -----------------
EasyBuild/1.11.1       GCC/4.9.0              INTEL-140-MPICH/3.1.1
EasyBuild/1.13.0       INTEL/14.0.2           INTEL-140-MVAPICH2/2.0
--- some stuff deleted ---

The module names take the form appname/version/compiler, providing the application name, the version, and information about how it was compiled (if needed).

Managing Modules

Besides avail, there are other basic module commands to use for manipulating the environment. These include:

add/load mod1 mod2 ... modn . . . Add modules
rm/unload mod1 mod2 ... modn  . . Remove modules
switch/swap mod . . . . . . . . . Switch or swap one module for another
display/show  . . . . . . . . . . List modules loaded in the environment
avail . . . . . . . . . . . . . . List available module names
whatis mod1 mod2 ... modn . . . . Describe listed modules

The -h option to module will list all available commands.

▶ Did not find the version you want to use??

If a software package you would like to use for your research is not available on a cluster, you can request it to be installed. The software requests are evaluated by the HPC staff on a case-by-case basis. Before you send in a software request, please go through the information below.

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Types of request

Depending on how many users need to use the software, software requests are divided into three types, each of which corresponds to the location where the software is installed:

  • The user's home directory
    • Software packages installed here will be accessible only to the user.
    • It is suitable for software packages that will be used by a single user.
    • Python, Perl and R modules should be installed here.
  • /project
    • Software packages installed in /project can be accessed by a group of users.
    • It is suitable for software packages that
      • Need to be shared by users from the same research group, or
      • are bigger than the quota on the home file syste.
    • This type of request must be sent by the PI of the research group, who may be asked to apply for a storage allocation.
  • /usr/local/packages
    • Software packages installed under /usr/local/packages can be accessed by all users.
    • It is suitable for software packages that will be used by users from multiple research groups.
    • This type of request must be sent by the PI of a research group.

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How to request

Please send an email to sys-help@loni.org with the following information:

  • Your user name
  • The name of cluster where you want to use the requested software
  • The name, version and download link of the software
  • Specific installation instructions if any (e.g. compiler flags, variants and flavor, etc.)
  • Why the software is needed
  • Where the software should be installed (locally, /project, or /usr/local/packages) and justification explaining how many users are expected.

Please note that, once the software is installed, testing and validation are users' responsibility.

About the Software

LAPACK is written in Fortran90 and provides routines for solving systems of simultaneous linear equations, least-squares solutions of linear systems of equations, eigenvalue problems, and singular value problems. - Homepage: http://www.netlib.org/lapack/

Usage

LAPACK is a binary library, so it is linked to your program by the compiler during the build process by adding the -llapack flag to the link line:

Fortran

$ ifort sample.f -llapack

Open Fortran Example?

Fortran Source

!**********************************************
! THIS EXAMPLE USES THE LAPACK ROUTINE DGESV 
! TO SOLVE A SYSTEM OF LINEAR EQUATIONS AX=B 
! A = [1, 2, 3; 4, 5, 6; 7, 8 10]            
! B = [1, 0; 0, 1; 0, 0]
! *********************************************
 program lapack_test
  integer ipiv(3), info, i, j
  double precision A(3,3), B(3,2)
  A(1,1)=1
  A(1,2)=2
  A(1,3)=3
  A(2,1)=4
  A(2,2)=5
  A(2,3)=6
  A(3,1)=7
  A(3,2)=8
  A(3,3)=10
  
  B(1,1)=1
  B(2,1)=0
  B(3,1)=0
  B(1,2)=0
  B(2,2)=1
  B(3,2)=0

  call dgesv (3,2,A,3,ipiv,B,3,info)
  if(info .EQ. 0) then
     do i=1,3
        write(*,'(2F8.3)') (B(i,j), j=1,2)
     enddo
  endif
 end program lapack_test

Build and Execute

$ ifort lapack_test.f90 -llapack
$ ./a.out
  -0.667  -1.333
  -0.667   3.667
   1.000  -2.000

C

The LAPACK routines must be declared with extern, the routine name must be in lowercase, and it must be followed by an _ (i.e. underscore):

extern void dgetrf_(int*, int*, double*, int*, int*, int*);

Be sure when calling the LAPACK routing that all arguments are passed by reference.

Note: Since C matrices are stored in row major order, and Fortran matrices are stored in column major order, a transpose is necessary to go from C to Fortran order, and the result transposed again from Fortran to C order. It is more efficient to change the array indexing to take this into account.

$ icc sample.c -llapack

Open C Example?

C Source

$ cat lapack_test.c
/**********************************************
 * THIS EXAMPLE USES THE LAPACK ROUTINE DGESV 
 * TO SOLVE A SYSTEM OF LINEAR EQUATIONS AX=B 
 * A = [1, 2, 3; 4, 5, 6; 7, 8 10]            
 * B = [1, 0; 0, 1; 0, 0]
 **********************************************/
#include 

extern void dgesv_(int*, int*, double*, int*, int*, double*, int*, int*);

int main()
{
  int n, nrhs, lda, ldb, IPIV[3], info, i;
  double A[3][3], B[2][3];  // Matrices must be transposed
  A[0][0] = 1; A[1][0] = 2; A[2][0] = 3;
  A[0][1] = 4; A[1][1] = 5; A[2][1] = 6;
  A[0][2] = 7; A[1][2] = 8; A[2][2] = 10;

  B[0][0] = 1; B[0][1] = 0; B[0][2] = 0;
  B[1][0] = 0; B[1][1] = 1; B[1][2] = 0;

  n = 3;
  nrhs = 2;
  lda = 3;
  ldb = 3;
  
  dgesv_(&n, &nrhs, (double *)A, &lda, IPIV, (double *)B, &ldb, &info);

  if(info == 0)
    {
      for(i = 0; i < 3; i++)
	printf("%8.3f %8.3f\n", B[0][i], B[1][i]);
    }
}

Build and Execute

C++

The LAPACK routines must be declared with extern "C", the routine name must be in lowercase, and it must be followed by an _ (i.e. underscore):

extern "C" void dgetrf_(int*, int*, double*, int*, int*, int*);

Be sure when calling the LAPACK routing that all arguments are passed by reference.

Note: Since C++ matrices are stored in row major order, and Fortran matrices are stored in column major order, a transpose is necessary to go from C to Fortran order, and the result transposed again from Fortran to C order. It is more efficient to change the array indexing to take this into account.

$ icpc sample.c -llapack

Open C++ Example?

C Source

$ cat lapack_test.c
/**********************************************
 * THIS EXAMPLE USES THE LAPACK ROUTINE DGESV 
 * TO SOLVE A SYSTEM OF LINEAR EQUATIONS AX=B 
 * A = [1, 2, 3; 4, 5, 6; 7, 8 10]            
 * B = [1, 0; 0, 1; 0, 0]
 **********************************************/
#include 

extern void dgesv_(int*, int*, double*, int*, int*, double*, int*, int*);

int main()
{
  int n, nrhs, lda, ldb, IPIV[3], info, i;
  double A[3][3], B[2][3];  // Matrices must be transposed
  A[0][0] = 1; A[1][0] = 2; A[2][0] = 3;
  A[0][1] = 4; A[1][1] = 5; A[2][1] = 6;
  A[0][2] = 7; A[1][2] = 8; A[2][2] = 10;

  B[0][0] = 1; B[0][1] = 0; B[0][2] = 0;
  B[1][0] = 0; B[1][1] = 1; B[1][2] = 0;

  n = 3;
  nrhs = 2;
  lda = 3;
  ldb = 3;
  
  dgesv_(&n, &nrhs, (double *)A, &lda, IPIV, (double *)B, &ldb, &info);

  if(info == 0)
    {
      for(i = 0; i < 3; i++)
	printf("%8.3f %8.3f\n", B[0][i], B[1][i]);
    }
}

Build and Execute

Resources

  • LAPACK Users Guide
  • Individual LAPACK routines are documented in their own man page. To get more information on a given routine, use the command:
    $ man routine_name
    

    For example, to get informantion on dgesvd:

    $ man dgesvd
    

Last modified: September 10 2020 11:58:50.