Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!udel!nigel.ee.udel.edu!mccalpin From: mccalpin@perelandra.cms.udel.edu (John D. McCalpin) Newsgroups: comp.arch Subject: Re: Be Prepared... Message-ID: Date: 16 Feb 91 17:31:29 GMT References: <1991Feb13.160718.25759@visix.com> <3206@crdos1.crd.ge.COM> <6050@mentor.cc.purdue.edu> Sender: usenet@ee.udel.edu Organization: College of Marine Studies, U. Del. Lines: 26 Nntp-Posting-Host: perelandra.cms.udel.edu In-reply-to: hrubin@pop.stat.purdue.edu's message of 16 Feb 91 14:25:46 GMT In article <3206@crdos1.crd.ge.COM>, davidsen@crdos1.crd.ge.COM writes about a program which fills a 64-bit address space: > Assuming that you have a 1 gigaBYTE bus on that memory, it will take > 316 years (almost 317) to swap a program in. On 16 Feb 91 14:25:46 GMT, hrubin@pop.stat.purdue.edu (Herman Rubin) replied: Herman> [...] I see no way to get your pessimistic result. Herman probably did not understand what Davidsen was saying. I get a slightly different number from the following calculation: perelandra 1% bc m=2^64 % number of bytes addressable by 64 bits 18,446,744,073,709,551,616 % a big number 2*10^19 r=1,000,000,000 % 1 GB/s data bus rate m/r 18,446,744,073 % time in seconds for transfer m/r/(86400*365) 584 % time in years for transfer quit -- John D. McCalpin mccalpin@perelandra.cms.udel.edu Assistant Professor mccalpin@brahms.udel.edu College of Marine Studies, U. Del. J.MCCALPIN/OMNET