Re: can Mathematica use dual processors?

*To*: mathgroup at smc.vnet.net*Subject*: [mg24579] Re: can Mathematica use dual processors?*From*: Harald Giese <giese at ifm.uni-hamburg.de>*Date*: Tue, 25 Jul 2000 00:56:11 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

rob wrote: > > I looked thru the postings and didn't find this subject. Sorry if it > has been discussed a lot and I missed it. > > I'm wondering if having dual processor sysem will speed up mathematica > v. 4.0? Seems like several years ago this was discussed and Mathematica > couldn't make use of the dual scheme. That may have changed. > Hi Rob, There is no speed up on dual processor system. Even worse, some computations may take longer! This happens with the benchmark test of Stefan Steinhaus (www.scientificweb.de/testreport/mathtest3.nb): Pentium II, 512MB RAM, Win. NT 4.0 (SP5), Mma. Version: 4.0.0 SINGLE CPU: Creation,trans.,resh. of a matrix 24.359 Sorting of values in asc. order 11.766 450001! 28.5, Computation of prime numbers 15.938 Computation of Fibonacci numbers 33.281 "Creation of a Toeplitz matrix 27.094 Computation of Pi on 200000 decimals 18.469 Comp. of the inverse of a matrix 35.875 Comp. of Eigenvalues of matrix 58.781 Numerical comp. of a triple integral 12.469 FFT over 4194304 random values 13.235 Polynomial regression 67.25, Comp. of a Laplace transformation 26.141 Solving of the Euler-McLaurin sum. 1.64 Comp. of 5 Koch Snowflakes 20.078 High resolution Klein Bottle 63.219 Parametric plot of 3 pipes 34.782 Animation of a 3D Mountain in heatcol. 22.328 Total timing: 515.205 DUAL CPU: Creation,trans.,resh. of a matrix 24.219 Sorting of values in asc. order 11.703 450001! 28.453 Computation of prime numbers 15.703 Computation of Fibonacci numbers 32.594 "Creation of a Toeplitz matrix 26.563 Computation of Pi on 200000 decimals 18.406 Comp. of the inverse of a matrix 35.594 Comp. of Eigenvalues of matrix 58.156 Numerical comp. of a triple integral 38.39 (!) FFT over 4194304 random values 13.313 Polynomial regression 65.547 Comp. of a Laplace transformation 27.421 Solving of the Euler-McLaurin sum. 1.563 Comp. of 5 Koch Snowflakes 19.719 High resolution Klein Bottle 145.5 (!!) Parametric plot of 3 pipes 34.234 Animation of a 3D Mountain in heatcol. 22.265 Total timing: 619.343 There is the "Parallel Computing Toolkit" written by R. Maeder (www.mathdirect.com/products/par) available, but it costs some money (USD 845/USD 445 Educational) and you have to call explicitly the parallel functions (e.g. ParallelMap instead of Map). Regards, Harald -- Harald Giese Email: giese at ifm.uni-hamburg.de Phone: +49 (0)40 42838 5796; Fax: +49 (0)40 5605724 Institut fuer Meereskunde der Universitaet Hamburg (Institute of Oceanography of the University of Hamburg) Troplowitzstrasse 7, D-22529 Hamburg