User's Guide: Installation:Performance

Next:Usage Previous:Trouble Shooting


Performance: Timing the speed of SPRNG Libraries

On building the SPRNG library, executables will be created to time each generator provided. A shell script called timesprng is provided that will run each of these timing executables. Enter the following command in the same directory where the SPRNG libraries reside in order to determine the speeds of the generators on your machine:

timesprng

The output will give the time taken to generate a million random numbers and also the number of random numbers generated per second, in millions (MRS). These results are based on the timings in C programs. FORTRAN timings are also given for millions of random numbers generated per second.

We give below a table of timing results on a few parallel platforms, in Millions of Random Numbers per Second for the integer and double precision numbers generated:



Time SPRNG

CRAY T3E HP/CONVEX Exemplar IBM SP2 SGI-CRAY Origin 2000 SGI Power Challenge
Clock Speed MHz 300 180 135 195 195
drand48()
(for comparison)
2.6 0.32 1.4 1.8 1.8
C LCG48
Integer
14.5 7.7 4.4 10.3 10.2
C LCG48
Double Precision
6.3 5.9 5.0 8.7 8.3
FORTRAN LCG48
Integer
12.8 7.7 5.3 10.3 10.2
FORTRAN LCG48
Double Precision
6.1 6.2 3.3 8.5 8.5
C LFG
Integer
5.5 6.7 4.0 6.1 5.8
C LFG
Double Precision
3.2 3.2 3.2 3.8 3.8
FORTRAN LFG
Integer
5.4 6.3 4.1 5.2 5.3
FORTRAN LFG
Double Precision
3.3 2.9 3.2 3.6 3.8
C LCG64
Integer
16.6 10.0 5.6 11.5 11.5
C LCG64
Double Precision
6.5 6.7 4.0 7.8 7.8
FORTRAN LCG64
Integer
14.5 7.7 5.0 10.8 10.8
FORTRAN LCG64
Double Precision
6.3 6.3 3.6 7.8 7.8
C CMRG
Integer
8.6 5.6 1.9 4.6 4.7
C CMRG
Double Precision
4.8 4.8 1.8 3.6 4.3
FORTRAN CMRG
Integer
8.4 5.0 1.9 4.2 4.5
FORTRAN CMRG
Double Precision
4.7 4.8 1.7 3.6 3.5
C MLFG
Integer
5.6 5.3 4.2 8.3 8.3
C MLFG
Double Precision
5.0 5.3 3.1 6.0 6.1
FORTRAN MLFG
Integer
5.9 3.3 3.8 7.6 8.2
FORTRAN MLFG
Double Precision
3.1 2.8 3.2 5.6 6.0
C PMLCG
Integer
7.5 0.7 2.2 2.5 2.4
C PMLCG
Double Precision
4.2 0.7 1.8 2.3 2.3
FORTRAN PMLCG
Integer
7.2 0.61 1.9 2.5 2.5
FORTRAN PMLCG
Double Precision
4.1 0.58 1.9 2.4 2.5


[Quick 
Start] [User's 
Guide] [Reference 
Manual] [Quick 
Reference]