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Performance Measurement Card for the IBM Personal Computer XT/370

IP.com Disclosure Number: IPCOM000061705D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Buonomo, JP: AUTHOR [+5]

Abstract

To evaluate a computing system, a method of producing quantitative measurements is required. The instruction rate of a processor and the time required for it to execute "benchmark" programs are commonly used as the measure by which such evaluations are made. In very small systems, parameters, such as the instruction rate, can be predicted by analysis. However, as systems grow in complexity, the respective analyses frequently become too cumbersome to produce accurate results. Empirical methods can be used to obtain the desired information in a straightforward manner, but usually require the use of an instrument to make measurements of the performance parameters. An important characteristic of such an instrument is that it remain passive with respect to the system under evaluation.

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Performance Measurement Card for the IBM Personal Computer XT/370

To evaluate a computing system, a method of producing quantitative measurements is required. The instruction rate of a processor and the time required for it to execute "benchmark" programs are commonly used as the measure by which such evaluations are made. In very small systems, parameters, such as the instruction rate, can be predicted by analysis. However, as systems grow in complexity, the respective analyses frequently become too cumbersome to produce accurate results. Empirical methods can be used to obtain the desired information in a straightforward manner, but usually require the use of an instrument to make measurements of the performance parameters. An important characteristic of such an instrument is that it remain passive with respect to the system under evaluation. That is, performance measurements should not degrade the performance of the system being tested. In order to obtain precise results, the influence of the measuring instrument on the system under evaluation should be kept to a minimum. As part of the development of the IBM Personal Computer XT/370 (PC XT/370), it became necessary to acquire performance information to evaluate its viability as a productive workstation. Instruments, such as the IBM Systems Measurement Instrument (SMI), are available to obtain performance data on computing systems. However, due to their general nature, systems, such as the SMI, are too remote to efficiently and accurately measure performance on a system, such as the PC XT/370. A PC Performance Measurement Card (PCPMC) effectively obtains the required performance data for a PC XT/370 by residing within the PC XT/370 as a Personal Computer (PC) driven device. The base of the PCPMC consists of four timer/counter LSI components, each containing five fully programmable 16-bit counters. A 1 MHz time base, PC interface logic, input signal buffers, and general- purpose logic for creating gating functions from the input signals constitute the remaining support logic. The counters are partitioned into timing and counting fun...