Method for keeping accurate time in a computer system

Details Method for keeping accurate time in a computer system Method for keeping accurate time in a computer system

G - Physics

06

F

G06F 1/14 (2006.01) G04G 5/00 (2006.01)

Patent

CA 2263402

A computing system develops time/date values by using a free-running counter to measure and accumulate increments of time. The increments of time are converted from the resolution of the free-running counter to that used for the time and date values by dividing by a conversion variable and then used to update the time/date value. The accuracy of the time/date value is monitored by periodically comparing the rate of the free-running counter to the rate of a more accurate, external clock. The ratio of these two rates is used to adjust the conversion variable. The conversion variable reflects any differences between (1) the rate of change of the increments of time used for developing the time/data value and (2) the external clock. Its use here, therefore, will operate to either slow down or speed up the rate of change of the time/date value so that it more closely tracks the external clock.

Un système informatique élabore des valeurs d'horodatage en recourant à un compteur non synchronisé pour mesurer et accumuler des incréments de temps. Lesdits incréments sont convertis pour passer de la résolution du compteur non synchronisé à celle du système d'horodatage en les divisant par une variable de conversion qui sert à actualiser les valeurs d'horodatage. On contrôle la précision des valeurs d'horodatage en comparant périodiquement le rythme du compteur non synchronisé à celui d'une horloge externe plus précise. Le rapport des deux rythmes permet d'ajuster la variable de correction. Ladite variable reflète toute différence entre (1) le rythme de variation des incréments de temps servant à élaborer les valeurs d'horodatage, et (2) l'horloge externe. Elle servira soit à ralentir soit à accélérer le rythme de variation des valeurs d'horodatage pour qu'elles suivent de plus près l'horloge extérieure.

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