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GNU Scientific Library on cluster

Intro: The GNU Scientific Library (GSL) is a numerical library for C and C++ programmers. The library provides a wide range of mathematical routines such as random number generators, special functions and least-squares fitting. There are over 1000 functions in total with an extensive test suite.

The complete range of subject areas covered by the library includes,

Complex Numbers Roots of Polynomials Special Functions
Vectors and Matrices Permutations Sorting
BLAS Support Linear Algebra Eigensystems
Fast Fourier Transforms Quadrature Random Numbers
Quasi-Random Sequences Random Distributions Statistics
Histograms N-Tuples Monte Carlo Integration
Simulated Annealing Differential Equations Interpolation
Numerical Differentiation Chebyshev Approximation Series Acceleration
Discrete Hankel Transforms Root-Finding Minimization
Least-Squares Fitting Physical Constants IEEE Floating-Point
Discrete Wavelet Transforms


The GSL website http://www.gnu.org/software/gsl/



How to use GSL on cluster Step 1: Please read "how to setup your working environment" and do the following:

a. Include the sentence of "module load gsl/default" in the module-loading blocks in your .bashrc file

b. Type ". .bashrc" in your terminal, and then type "module list or type "which blastall" in your terminal again, you shall be able to see: 
[testy@n137 ~]$ . .bashrc
[testy@n137 ~]$ module list
Currently Loaded Modulefiles:
   1) gsl/default
If you see the above output on terminal, it means your environment has been setup correctly.

c. check your gnu c/c++ compiling path. 
[testy@n137 namd]$ which gcc
/usr/bin/gcc
[testy@n137 namd]$ which g++
/usr/bin/g++

check your LD_LIBRARY_PATH path. 
[testy@n137 namd]$ echo $LD_LIBRARY_PATH
/shr/home/source/gsl/lib
This indicates your environment has been setup correctly and you can begin to work and submit your job. (Your MUST setup the LD_LIBRARY_PATH correctly).

Step 2. Compiling and running your program

The example testGSL.c and the Makefile can be downloaded to your working directory. 
[testy@n137 ~]$ cd /shr/home/testy/your_working_dir
[testy@n137 ~]$ make -f testGSL.mak
gcc -I/source/gsl/include  -o testGSL.o -c testGSL.c
gcc -L/source/gsl/lib  testGSL.o -lgsl -lgslcblas -lm -Wall   -o testGSL
run your program . 
[testy@n137 ~]$ ./testGSL
plain ==================
result =  1.391775
sigma  =  0.003746
exact  =  1.393204
error  = -0.001429 = 0.4 sigma
miser ==================
result =  1.393587
sigma  =  0.000913
exact  =  1.393204
error  =  0.000383 = 0.4 sigma
vegas warm-up ==================
result =  1.390760
sigma  =  0.003309
exact  =  1.393204
error  = -0.002444 = 0.7 sigma
converging...
result =  1.393244 sigma =  0.000111 chisq/dof = 4.4
result =  1.393238 sigma =  0.000083 chisq/dof = 0.7
vegas final ==================
result =  1.393238
sigma  =  0.000083
exact  =  1.393204
error  =  0.000034 = 0.4 sigma
Time elapsed: 7.010000
After you finish the testing, PLEASE read how to submit jobs in cluster to run your compiled program, DONOT run it directly on n62 or n63.






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