Boots – shoes – and leggings
Patent
1993-04-06
1995-09-12
Kriess, Kevin A.
Boots, shoes, and leggings
364200, 3642283, 3642681, 3642683, 3642689, 364269, 364DIG1, 39520019, G06F 1116, G06F 1120
Patent
active
054505739
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to devices for monitoring the synchronization in a multicomputer system having parallel-working individual computers, and more particularly to such a device that evaluates the time between synchronization-readiness signals, which are produced by the various computers of the multicomputer system or their synchronization modules and which signals indicate the attainment of a specified synchronization point, and to such a device that severs a computer, which does not output its synchronization-readiness signal within a specified time span after receiving the synchronization-readiness signals from the other computers. Such a device is disclosed by the German Provisional Patent 12 698 27.
Data flow among computers must be synchronized from time to time, especially in those multicomputer systems, in which the individual computers have separate clock-pulse generators and must exchange data among themselves. This is particularly necessary in situations where the number of computers is increased for security and reliability reasons and, in some instances for availability reasons, and where the computers continually compare themselves to one another to check for conformity in order to detect malfunctions. Computers also have to be synchronized when data (e.g., messages and commands) are simultaneously input via external interrupts. The maximum permissible time spans, within which a mutual synchronization must take place, depend essentially upon the clock frequency of the computer-clock-pulse generators and upon the accuracy of these clock-pulse generators.
German Provisional Patent 19 52 926 discloses a method for synchronizing two parallel-working data processing units, one of which is active and the other of which constitutes a reserve unit. The active unit in each case generates synchronizing signals in periodic intervals. These signals serve in the reserve unit to phase lock the clock-pulse generator there to the phase position of the clock signals from the controlling unit. This known method is not suited for multicomputer systems that have several controlling computers due to the unpredictable manner in which the computer emitting the synchronizing signals influences the data processing of the other computers, when correcting their clock-pulse generators.
German Provisional Patent 21 55 159 discloses an arrangement for synchronizing a multitude of computers in a computer system, in which the individual computers are mutually synchronized by having the computer that is the first to reach a synchronization point anchored in its program transmit a synchronization signal via a common line shared by all the computers to the remaining computers. This synchronization signal is stored in the remaining computers for a certain length of time. It blocks the synchronization signals generated there within the remaining computers themselves, and activates a pulse-generating circuit, by means of which a counter for clock signals is forced into the same switch position to which the corresponding counter of the fastest computer had been switched. This completes the synchronization process. In the case of this known configuration for synchronizing the computers of a multicomputer system, the failure of one computer, or rather of the circuit elements allocated to this computer for synchronization purposes, is not detected. Additionally, this known configuration fails to verify whether or not the computer actually assumes the specified switch position in the slower-running computers.
German Provisional Patent 24 13 401 discloses a device for synchronizing a two-out-of-three computer system, in which the processing of a new command is made dependent upon at least two of the three computers having established completion of the preceding command. Time-delay elements assure that the slowest computer at the time is able to complete the execution of commands and then simultaneously begin, together with the other computers, with the processing of the following command.
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Banankhah Majid A.
Kriess Kevin A.
Siemens Aktiengesellschaft
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