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Tenex load averages for July 1973 (RFC0546) Disclosure Number: IPCOM000006054D
Original Publication Date: 1973-Aug-10
Included in the Prior Art Database: 2001-Nov-29
Document File: 5 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Thomas: AUTHOR


This RFC presents utilization data for the BBN and ISI TENEX systems which may be of interest to the network community. (Download file contains alternative document formats.)

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Network Working Group                                          B. Thomas

Request for Comments: 546                                      BBN-TENEX

NIC: 17792                                                10 August 1973

                   TENEX Load Averages for July 1973

   This RFC presents utilization data for the BBN and ISI TENEX systems

   which may be of interest to the network community.

   The graph on page 4 summarizes the load at the BBN-TENEX and USC-ISI

   Hosts during the work week for the month of July 1973.  The weekday

   hourly load average [1] for each site is plotted versus the time of

   day; the time of day is Eastern Daylight Time.

   Interpreting data such as this is tricky business.  However, it is

   difficult to resist making the following observations:

   1. The shapes of the BBN and ISI curves are approximately the same;

      furthermore, there is no skew between the curves.  This suggests

      that the user populations for the two systems have similar working

      habits and are acclimated to the same time zone.

   2. The significant features of both curves appear to be strongly

      correlated with "normal events" in the day of a user living on

      East Coast time,suggesting that the load at both sites is

      influenced most strongly by such users:

      a. the load begins to increase between 7-8 a.m. EDT as users begin

         their daily computing;

      b. it dips between 10-11 a.m. EDT (smoothed to a smaller rate of

         increase in the ISI curve) as users take their coffee break;

      c. the load peaks sharply between 1-2 p.m. EDT as users return

         from lunch to resume their computing;

      d. it decreases as the afternoon continues and as users go home

         from work;

      e. it reaches a local minimum between 6-7 p.m. EDT (minimum not

         present in ISI curve) when most people eat dinner;

      f. it increases to an evening peak between 9-10 p.m. EDT as some

         users come back from dinner and after dinner activities to

         resume their computing.

Thomas                                                          [Page 1]

RFC 546            TENEX Load Averages for July 1973      10 August 1973

   3. The curve for ISI is smoother than the one for BBN: the "coffee

      break" dip appears only as a decrease in slope; the dinner break

      and evening peak are completely smoothed  out.  This smoothing is

      probably due to the influence of the West Coast users of the ISI


   4.  During July the BBN system was more heavily loaded than the ISI

      system.  Since the data collected did not include the number of...