Re: AMD vs. Intel Floating Point
- To: mathgroup at smc.vnet.net
- Subject: [mg29486] Re: AMD vs. Intel Floating Point
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 22 Jun 2001 02:20:14 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <9gs2vm$k4f$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, a) the Mathematica speed comparsion from http://fampm201.tu-graz.ac.at/karl/timings40.html is posted regular in this news group b) on the www-site of *this* news group http://smc.vnet.net/mathgroup.html the second head line is a link to various speed comparsions found at http://smc.vnet.net/mathbench.html and it is quite natural to assume, that a poster to a news-group has visited the newsgroup hompage and is able to read and understand the headings on a page that begins with: ----------------------------------------------------------- >Designed by S. Christensen. > >MathGroup > >The Email Group for Mathematica Users > >Comparison of Mathematica on Various Computers > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >MathGroup is now linked to the moderated newsgroup > >comp.soft-sys.math.mathematica > > on the Internet. Contact your local system administrator > to find out how to read this new group. ----------------------------------------------------------- *and* it is quite natural to assume that a poster to the news group has read the group rules (on the same page) one of it say: >PLEASE SEARCH THE ARCHIVES BEFORE YOU ASK WHAT MIGHT BE A COMMON QUESTION. >See the links above for this. It must be also sayed, that the Mathematica speed depends in the most (symbolic) applications not on the floating point power of the CPU. The most actions performed by Mathematica are pointer operations with it's internal data structures. I would assume that 80-90 % of Mathematica's CPU load are pure interger operations. High precision calculations, symbolic operations, operations with integers, rationals ... all that don't use the floating point hardware. It depends shaply on the application how much floating point operations are used. But when a Mathematica function has such a huge floating point load it is always better to write a MathLink program. Regards Jens Morfeas79a wrote: > > Kofi > as it is well known the AMD processors up untill the model of K6-3D > have serious problems in their floating point operations - this can be > observed by running programs with great CPU load like SETI@home, the > time for a AMD computer to finish one work unit is about twice as big > as this in an Intel computer running on the same MHz. The problem has > been solved in later models. Of course all this is not known to > Mr.Kuska who thinks that 90% of the questions sent in this newsgroup > are of trivial nature or in anycase foolish. > > Regards > Jim