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Browse Prior Art Database

High Resolution Timer

IP.com Disclosure Number: IPCOM000076825D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Boyle, W: AUTHOR [+2]

Abstract

The rotational speed of a direct-access device can be used as a measuring standard for timing intervals of central processing unit (CPU) activity. To accomplish this, a timing data set is created on a full cylinder of a direct-access volume. The volume must be mountable upon a device operable in a multitrack mode and the speed of rotation of the volume must be known. A number of tracks are used where the total number of tracks, times the rotational speed for a single revolution is greater than the time interval to be measured. Thus, in the illustration, 1 represents the cylinder of a direct-access volume on which are written a number of tracks numbered from 1 to n, track j being representative of any one of the tracks. Each track j is divided into a number of logical records, each of L bytes where L is preferably 8.

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High Resolution Timer

The rotational speed of a direct-access device can be used as a measuring standard for timing intervals of central processing unit (CPU) activity. To accomplish this, a timing data set is created on a full cylinder of a direct-access volume. The volume must be mountable upon a device operable in a multitrack mode and the speed of rotation of the volume must be known. A number of tracks are used where the total number of tracks, times the rotational speed for a single revolution is greater than the time interval to be measured.

Thus, in the illustration, 1 represents the cylinder of a direct-access volume on which are written a number of tracks numbered from 1 to n, track j being representative of any one of the tracks.

Each track j is divided into a number of logical records, each of L bytes where L is preferably 8. The number of records written on each track is equal to the length B (in bytes) of the maximum size block that can be written on a track divided by L. Within the timing tracks numbered from 1 to n, track j being representative of any one of the tracks. Each track j is divided into a number of logical records, each of L bytes where L is preferably 8. The number of records written on each track is equal to the length B (in bytes) of the maximum size block that can be written on a track divided by L. Within the timing data set, each individual record I would be set to a value v according to the following formula: v = T (J + (I x R/B...