Message Response Time Based on SNA PIU Flow

Publishing Venue

IBM

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Abstract

This article describes a method that can be used to compute message response time by analyzing SNA (System Network Architecture) PIU (Path Information Unit) flows. SNA is an architecture used in the sending and receiving of information between end points in a communications network. PIUs are the packages of information that flow in a network. The measurement of response time is of prime importance to the personnel charged with maintaining the performance of an operational network. The method described in this article can be used to calculate both host and network transit times. The sum of those two times is the message response time. The flow examined consists of PIUs flowing inbound and outbound from the host CPU perspective.

Message Response Time Based on SNA PIU Flow

This article describes a method that can be used to compute message response time by analyzing SNA (System Network Architecture) PIU (Path Information Unit) flows. SNA is an architecture used in the sending and receiving of information between end points in a communications network. PIUs are the packages of information that flow in a network. The measurement of response time is of prime importance to the personnel charged with maintaining the performance of an operational network. The method described in this article can be used to calculate both host and network transit times. The sum of those two times is the message response time. The flow examined consists of PIUs flowing inbound and outbound from the host CPU perspective. Message response time is that amount of time between the time a terminal operator hits the ENTER key and the time a reply is received back at the terminal. Host transit time is the amount of time a message spends as a work unit in a network host. Network transit time is the amount of time a message spends moving from the terminal to a network host plus the time the reply takes to get from the network host to the terminal. To compute the transit and response times, certain events must be examined and the time between the events measured. Those events and the rules used for response time calculation are described below. General Logic Rules Applying to All PIUs: 1. Only function management PIUs may b...