公开(公告)号：CA1175573A

公开(公告)日：1984-10-02

申请号：CA413263

申请日：1982-10-12

Applicant: IBM

Inventor： CORMIER ROGER L ,  DUGAN ROBERT J ,  GUYETTE RICHARD R ,  HANKISON RONALD L ,  HAO MING C ,  LEVIN ARTHUR L ,  MCCLAIN GEORGE A ,  WANISH PAUL J ,  ZEITLER CARL JR

IPC: G06F3/00 ,  G06F11/34 ,  G06F9/00 ,  G06F15/00

Abstract: P09-78-018 METHOD AND APPARATUS FOR MEASUREMENTS OF CHANNEL OPERATION A channel for a data processing system is provided with a time of day clock that is synchronized with the time of day clock of the associated central processor. Both the central processor and the channel processor record times of particular events, and the channel uses these times to calculate two times called Function Pending and Function Active. Both times begin when the central processor executes an instruction to begin an I/O operation. Function Pending ends when the channel has made successful initial selection. This time shows delays by the channel processor in scheduling the channel resources for I/O operations. Function Active ends at Channel End. A new instruction, Set Channel Monitor, enables or disables these measurements. An information block for each subchannel defines one of several measurement modes for a subchannel or disables the subchannel from measurement.

公开(公告)号：CA2084574C

公开(公告)日：1996-10-22

申请号：CA2084574

申请日：1992-12-04

Applicant: IBM

Inventor： KOVAL MICHAEL J ,  LAWTON WILLIAM W ,  MCCLAIN GEORGE A ,  TYLER JOHN G ,  WINTERS SCOTT L

IPC: G06F3/00 ,  G06F3/16 ,  G06F9/45 ,  G06F9/46 ,  G06F17/30 ,  G06F13/42

Abstract: A personal computer based, multimedia, data processing system includes a software solution to the problem of synchronizing two or more data streams which output data to two or more multimedia output devices. One stream is a master and each other stream is a slave. The master stream generates sync pulses that can be handled in two different synchronization methods, master-slave independent synchronization or master-driven slave synchronization. Sync pulses are generated with a predetermined granularity, and synchronization is achieved when a slave stream is out of tolerance. Adaptive resynchronization may be used to speed up or slow down a slave stream.

公开(公告)号：CA2084574A1

公开(公告)日：1993-07-01

申请号：CA2084574

申请日：1992-12-04

Applicant: IBM

Inventor： KOVAL MICHAEL J ,  LAWTON WILLIAM W ,  MCCLAIN GEORGE A ,  TYLER JOHN G ,  WINTERS SCOTT L

IPC: G06F3/00 ,  G06F3/16 ,  G06F9/45 ,  G06F9/46 ,  G06F17/30

Abstract: A personal computer based, multimedia, data processing system includes a software solution to the problem of synchronizing two or more data streams which output data to two or more multimedia output devices. One stream is a master and each other stream is a slave. The master stream generates sync pulses that can be handled in two different synchronization methods, master-slave independent synchronization or master-driven slave synchronization. Sync pulses are generated with a predetermined granularity, and synchronization is achieved when a slave stream is out of tolerance. Adaptive resynchronization may be used to speed up or slow down a slave stream.