g...@gabegold.com (Gabe Goldberg) writes: > https://jlelliotton.blogspot.com/p/the-economic-value-of-rapid-response.html
Yorktown research also did study of what was minimum human response threshold perception (somewhat skewed population, members of YKT research) ... and it varied for different people between .1seconds and .2second (threashold where person couldn't distinquish that it was getting faster). Thadani work then went back and looked at difference between "system response" and what the human saw. At there was difference between "system response" and 3270 response ... because minimum channel attached 3272/3277 added .089seconds ... so for human to see .25sec response ... the "system response" had to be .161secs (or better). When the 3274/3278 came out ... a lot of electronics was moved out of 3278 terminal back to 3274 controller (to reduce manufacturing cost) ... but it required a huge amount of coax protocol chatter latency between the 3274 controller and 3278 terminal ... resulting in typical .3sec-.5sec hardware response (depending on data stream) ... with a .3sec minimum. To achieve .3sec person response then required a zero second system response and to achieve .25sec person response (i.e. response seen by person) required system response to be negative .05seconds (needed time machine). there was complaints sent to the 3274/3278 product administrator ... and the eventual response was that 3274/3278 wasn't designed for interactive computing ... but instead for data entry (i.e. electronic keypunch). old post with some of the 3270 & system response comparison http://www.garlic.com/~lynn/2001m.html#19 and from IBM Jargon: bad response - n. A delay in the response time to a trivial request of a computer that is longer than two tenths of one second. In the 1970s, IBM 3277 display terminals attached to quite small System/360 machines could service up to 19 interruptions every second from a user I measured it myself. Today, this kind of response time is considered impossible or unachievable, even though work by Doherty, Thadhani, and others has shown that human productivity and satisfaction are almost linearly inversely proportional to computer response time. It is hoped (but not expected) that the definition of Bad Response will drop below one tenth of a second by 1990. -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
