X-Received: by 10.107.181.193 with SMTP id e184mr15696997iof.18.1523164884760; Sat, 07 Apr 2018 22:21:24 -0700 (PDT) X-Received: by 2002:a9d:1f58:: with SMTP id x24-v6mr1811266otx.9.1523164884464; Sat, 07 Apr 2018 22:21:24 -0700 (PDT) Path: csiph.com!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder-in1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!u184-v6no1208073ita.0!news-out.google.com!u64-v6ni1967itb.0!nntp.google.com!k65-v6no1196616ita.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.arch.storage Date: Sat, 7 Apr 2018 22:21:24 -0700 (PDT) In-Reply-To: <37nal4$ndg@geraldo.cc.utexas.edu> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=118.201.220.138; posting-account=2dygmAoAAADo8uePrZSokhWhHsFvk5ct NNTP-Posting-Host: 118.201.220.138 References: <37nal4$ndg@geraldo.cc.utexas.edu> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Re: Amdahl law, 1MIPS need 1MB mem & 1Mb/s I/O From: 393958790@qq.com Injection-Date: Sun, 08 Apr 2018 05:21:24 +0000 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Lines: 31 Xref: csiph.com comp.arch.storage:105 =E5=9C=A8 1994=E5=B9=B410=E6=9C=8815=E6=97=A5=E6=98=9F=E6=9C=9F=E5=85=AD UT= C+8=E4=B8=8A=E5=8D=889:18:28=EF=BC=8CSunil Gupta=E5=86=99=E9=81=93=EF=BC=9A > Hello Folks: >=20 > In many computer architecture books (e.g. Hennessy and Patterson, page 17= )=20 > and papers it is mentioned that : - " Amdahl-Case law states that a 1-MIP= S=20 > machine is balanced when it has 1 megabyte of memory and 1-megabit per se= c=20 > throughput of I/O."=20 >=20 > We have been trying to find the source of the above statement and have no= t been=20 > successful. Does anyone know the reasoning or the original source of the = above=20 > law. Any information in this direction will be greatly appreciated.=20 >=20 > Thanks very much.=20 >=20 > Sunil Gupta=20 > ECE Dept.=20 > Univ. of Texas at Austin > Austin, TX - 78712. You might find it here at: http://citeseerx.ist.psu.edu/viewdoc/download?doi=3D10.1.1.47.3870&rep=3Dre= p1&type=3Dpdf G. Amdahl. Storage and I/O Parameters and System Potential. In IEEE Compute= r GroupConference, pages 371=E2=80=9372, June 1970