From: SMTP%"MAILER-DAEMON@mwunix.mitre.org" 8-SEP-1997 17:15:24.11 To: CC: Subj: Returned mail: Host unknown (Name server: eisner.decus.disable-junk-email.org: host not found) Return-Path: Received: by arisia.gce.com (UCX V4.1-12C, OpenVMS V7.1 VAX); Mon, 8 Sep 1997 17:13:48 -0400 Received: from mwunix.mitre.org (mwunix.mitre.org [128.29.154.1]) by bort.mv.net (8.8.5/mem-951016) with ESMTP id KAA17367 for ; Mon, 8 Sep 1997 10:32:22 -0400 (EDT) Received: from localhost (localhost) by mwunix.mitre.org (8.8.6/8.8.6/mitre.0) with internal id KAA06856; Mon, 8 Sep 1997 10:30:59 -0400 (EDT) Date: Mon, 8 Sep 1997 10:30:59 -0400 (EDT) From: Mail Delivery Subsystem Message-Id: <199709081430.KAA06856@mwunix.mitre.org> To: Subject: Returned mail: Host unknown (Name server: eisner.decus.disable-junk-email.org: host not found) Auto-Submitted: auto-generated (failure) The original message was received at Mon, 8 Sep 1997 10:30:45 -0400 (EDT) from geverhart-pc.mitre.org [129.83.114.215] ----- The following addresses had permanent fatal errors ----- ----- Transcript of session follows ----- 550 ... Host unknown (Name server: eisner.decus.disable-junk-email.org: host not found) ----- Original message follows ----- Return-Path: Received: from geverhart-pc.mitre.org (geverhart-pc.mitre.org [129.83.114.215]) by mwunix.mitre.org (8.8.6/8.8.6/mitre.0) with SMTP id KAA06845 for ; Mon, 8 Sep 1997 10:30:45 -0400 (EDT) Message-ID: <34140C5D.57D6@gce.com> Date: Mon, 08 Sep 1997 10:31:57 -0400 From: Glenn Everhart Reply-To: Everhart@Arisia.GCE.Com Organization: Speaking for myself... X-Mailer: Mozilla 3.01 (Win95; U) MIME-Version: 1.0 To: lederman@eisner.decus.DISABLE-JUNK-EMAIL.org Subject: Re: Process schedulation References: <199709042040_MC2-1F3A-773F@compuserve.com> <5v0t60$ihh$1@sniff.shr.dec.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Bart Z. Lederman wrote: > > In article <199709042040_MC2-1F3A-773F@compuserve.com>, "Richard B. Gilbert" <76702.1567@compuserve.com> writes: > > > > There is a statistical distribution called "Erlang B" or the "Erlang > >Blocking Formula" and perhaps other names, that seems to me to apply to this > >question. The Telephone company uses Erlang B to determine the number of > >trunk lines they need between offices; e.g., given an arrival rate of calls, > >length of calls, length of time allowed waiting for an available trunk, you > >can calculate the number of trunk lines needed. Lotus Development uses it > >to determine how many people need to be answering the phones in customer > >service (it's the same problem). > > > > Bart Z. Lederman developed a solution for Erlang B and implemented it > >in a program that, given an appropriate set of variables, will solve for the > >missing one(s). Given the number of trunk lines, arrival rate of calls, > >length of calls, you can determine how long you will have to wait for a trunk > >line, etc. > > > > This program was available for FTP somewhere, several years ago. I > >believe that there is a copy on CompuServe's VAX Forum. I don't remember where > >it came from originally. > > I came from one of the RSX SIG tape collections, then I ported it to > VMS and it was on several of the VAX/L&T Tape collections. It may > even have been a separate library item. I also later ported it > to C, then again wrote a version using SMG as the interface and > posted that as an example of how to use SMG from C. The last > time I submitted it was at least 5 years ago, though. > > It also solves a few of the 'wait on queue for service' problems. > > I also have the text of a DECUS symposium session I did a few > times to teach people how to use blocking and queueing functions > to solve a number of 'users competing for service' problems. > > If it isn't floating around one of the varous software collections > on the web I can make it available to someone who wants to put it > up on a server. > > I didn't read the original note carefully enough to determine if this > is really what the original poster wants, though. But it could be > very useful for a lot of other people. > > -- > B. Z. Lederman Personal Opinions Only > > Posting to a News group does NOT give anyone permission > to send me advertising by E-mail or put me on a mailing > list of any kind. > > Please remove the "DISABLE-JUNK-EMAIL" if you have a > legitimate reason to E-mail a response to this post. Steve Zalewski has a copy of the CDs that I made of all the vms sig tapes from S79 to prelim F95, and a bit more. Your stuff would be on there... glenn