From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=0.1 required=5.0 tests=BAYES_05,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,d901a50a5adfec3c X-Google-Attributes: gid103376,public X-Google-Thread: 1094ba,9f0bf354542633fd X-Google-Attributes: gid1094ba,public From: Jonathan Guthrie Subject: Re: Fortran or Ada? Date: 1998/10/06 Message-ID: <6vdui0$mr3$1@news.hal-pc.org>#1/1 X-Deja-AN: 398393199 References: <36068E73.F0398C54@meca.polymtl.ca> <360A3446.8AD84137@lmco.com> <6udre0$ha1$1@nnrp1.dejanews.com> <19980925.185359.250@yktvmv.watson.ibm.com> <6uifdr$dog$1@nnrp1.dejanews.com> <19980928.184428.604@yktvmv.watson.ibm.com> <19980929.214309.386@yktvmv.watson.ibm.com> <3615E297.57D3ED15@icon.fi> <6v5116$hr4$1@newnews.nl.uu.net> <36164A60.FA563BB0@icon.fi> <6vdmac$3nt$1@newnews.nl.uu.net> Organization: Information Broker Systems Internet Services Newsgroups: comp.lang.fortran,comp.lang.ada Date: 1998-10-06T00:00:00+00:00 List-Id: In comp.lang.ada Toon Moene wrote: > There are about 2**(23*2) single precision floating division pairs because > only the mantissa was relevant (give or take a factor of two). Given that > the Pentium could natively do an FDIV in 39 cycles, that means that at 78 Mhz > (for ease of reference), you'd need 2**45/10**6 seconds, or about (2**20 ~ > 10**6) 32 million seconds ~ 1 year. Note that this is just the time for the > FDIVs, not the comparisons. > I would be interested in a testing strategy that would do an exhaustive > search on the double precision space. You mean OTHER than building 10,000 demo boards and running the tests in parallel? (Realize that they sold the pentium processors for at least twice what the demo boards would likely cost and the fact that the exhaustive test would mean nothing to the marketability of the processors actually running the test so they could be sold at full price.) 10,000 too many to justify getting the results in less than an hour? (Not surprising: It would take far longer than that to set up such a test.) Well, 300 gets the test done in about a day and is a lot easier to set up. If you're willing to wait a week for results, then about 50 will do the job. I would expect them to actually do 10-12 and get the results in about a month. After all, the testing process usually takes longer than a month to complete and involves building a number of those simple SBC's. -- Jonathan Guthrie (jguthrie@brokersys.com) Information Broker Systems +281-895-8101 http://www.brokersys.com/ 12703 Veterans Memorial #106, Houston, TX 77014, USA We sell Internet access and commercial Web space. We also are general network consultants in the greater Houston area.