User's Guide: Installation:Performance

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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

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