SU1043659A2 - Device for simulating process of servicing requests having various priorities - Google Patents

Abstract

DEVICE FOR MODELING THE PROCESS OF SERVICING APPLICATIONS WITH DIFFERENT PRIORITIES BY Aut. ST. No. 962969, which differs from the fact that, in order to expand the functional power of the device by simulating the failures of the serving device, it additionally contains a random pulse sensor and a trigger, and the output of the random impulse sensor is connected to the counting trigger input, the single output of which is connected to the third inputs of the first and second elements are And, and the zero output of the trigger is connected to the inputs of the operation of the pulse generators with a random interval following.

Description

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with

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The invention relates to specialized computer facilities designed to simulate the process of servicing two flows of a request with different priority with one servicing device and can be used in devices simulating the operation of queuing systems. According to the main author. St. W 962969, a device comprising two pulse generators with a random following interval and three elements and, two triggers, an inhibit element and a diode, the input of the high priority terminal connected to the first input of the first element And whose output is connected to the first input of the first trigger, the start output of the first pulse generator with a random tracing interval — to the control input of the second pulse generator with a random tracing interval; the output of the first pulse generator with a random tracing interval, The first output of the device is connected to the first input of the third element I and the second input of the first trigger, the first output of which is connected to the second input of the first element AND, and the second output is connected to the control input of the prohibition element whose information input is connected with the output of the second element I, and the output is connected to the first input of the second trigger and through the diode to the output of the third element I and the start input of the second generator-pulses with a random interval, the output of which is the second output of the device connected to the second input of the second trigger, the first output of which is connected to the second input of the third element AND, and the second output connected to one of the inputs of the second AND element, the other input of which is an input of the low priority C1. A disadvantage of the known device is the impossibility of simulating failures of the servicing device occurring for one reason or another. The purpose of the invention is to expand the functional capabilities of the device by simulating the failures of the servicing device. The goal is achieved by the addition of random impulse sensors and a trigger to the device, with the output of the random impulse sensor connected to the counting input of a trigger, a single output of which is connected to the third inputs of the first and second elements AND, and the zero output of the trigger is connected to the generators pulses with a random spacing. Verbal model of the device operation is as follows. Two random flows for servicing flow to one service device. Applications for service with a lower priority are accepted for service in the absence of a request with a higher priority. For requests of the same priority, received at the moment when the servicing device is busy, the service is denied. If a higher priority application is received during the service period of a lower priority application, the lower priority application service is terminated, the higher priority application is served. After the release of the servicing device, the service previously received for servicing applications with a lower priority is resumed from the beginning. During operation in the service device failures may occur. In this case, the receipt of both priorities in the servicing device is terminated. The drawing shows a structural diagram of the proposed device. The device contains input 1 for a high priority wok, input 2 for a low priority wok, elements 3 and 4, triggers 5 and b of prohibition element 7, a diode 8, element 9 and 9, generators 10 and 11 pulses with a random following interval, sensor 12 random pulses and trigger 13. Device input 1 is connected to the first input of the element I 3, the output of which is connected to the first input of the trigger 5, the input of the generator 10 and the installation input of the generator 11. The output of the generator 10, one of the outputs of the device, is connected to the second input m trigger 5 and the first input element And 9. One output of the trigger 5 is connected to the second input of element 3 and the other to the control input of element 7 of the prohibition. Input device 2 is connected to the first input element And 4, the output of which is connected to the information input element. 7 prohibition. The output of element 7 is connected to the first input of the trigger 6, and through a diode to the input of the generator 11 and the output of the element AND 9. The second input of the trigger 6 is connected to the output of the generator 11, which is the second output of the device. The first output of the trigger 6 is connected to the second input of the And 4 element, and the second output is connected to the second input of the And 9 element. The service supply flows to the inputs ;: 1 and 2 are random pulse sequences. taylyyusti, moad intervals which are distributed according to certain (different or one and the same) laws. The actual model of a single servicing device is the generator of 10 and 11 pulses. The law of distribution of random pulses at the outputs of the generator 10 (and 11f is the same, since they simulate the same device. The time interval from the moment of starting the generators to the appearance of impulses at their output is random and distributed according to the adopted service law The diode 8 serves to isolate between the output of the element ri 9 and the input of the trigger 6. The sensor 12 outputs to the counting input of the trigger 13 with some set probabilities binary digits O and 1. The trigger 13 is the case 5. ST for fixing the pulse pulses. 12. Device can work in the following. modes: low priority queuing service; high priority queuing service; high priority queuing service, received during the low priority queuing service;} service device failure. The device works as follows: In the initial state in all modes, the triggers 5 and 6 is set to a position in which there is a high potential at the outputs connected to elements 3 and 4. At the same time, there is no voltage at the control input of the prohibition element and this element is open. Low priority service. The impulse from input 2 through elements 4 and 7 and diode 8 starts the generator 11, and trigger 6 is switched to the position at which the element I is closed until the end of the service of the incoming application. The applications received at this time from input 2 are not accepted for service and are lost. After the termination of the interception, the pulse from the output of the generator 11 transfers the trigger b to the voltage at which the element 4 is opened. Service for a high priority. The impulse From input 1 through the open element I 3 starts the generator 10 and transfers the trigger 5 to the peak, at which a high potential is removed from the element 3 and energizes the control input (prohibiting) input of the prohibition element 7. In this case, applications received from input 1 are lost, since the I-3 element is closed, and applications from input 2, which have passed the open AND 4 element, are also not accepted for service, since the prohibition element 7 is closed. After the end of the service and the appearance of the pulse Ra, the output of the generator 10, the circuit is reset, elements 3 and 7 are opened. Servicing the high priority requests received during the service period of the low priority requisition. The low priority from input 2 through the open element 7 starts the generator 11 and overturns the trigger 6, and the element 4 is closed, and the resolving potential is fed to the second input of the element 9 from the output of the trigger b. For higher priority, received from input 1 before generator 11 ends, the open element I 3 starts generator 10, sets generator 11 to its initial state (which simulates stopping service for low priority applications) and triggers trigger 5. this closes the element And 3 and the element 7 of the ban. In such a state, the scheme is held until the end of service of a high priority application. After the pulse at the output of the generator 10, simulating the end of service, the trigger 5 overturns, opening elements 3 and 7. At the same time, the same pulse passes through the element 9, at the second input of which there is a resolving potential from trigger b on a anlycK generator 11. simulates re-servicing of a low priority application, the service of which was interrupted by the receipt of a high priority application. Until the end of the service, trigger 6 holds element 4 and 4 in the closed state, and element 9 9 in the open state. volume ... After the appearance of a pulse at the output of the generator 11, the circuit returns to its original state. When a high priority application arrives from input 1 to the end of generator 11 operation, the low priority application service is again interrupted by setting generator 11 to the initial state with the output pulse of element 3 and impulse, and the device repeats in the same way. Service device failure. The next impulse from the sensor output 12 random impulses to the counting input of the trigger 13 overturns it, as a result of which a third potential is applied to the third inputs of elements I 3 and 4 and they remain closed with the next pulse and the generators are prohibited 10 n11. Giving a value

51043659 "

the likelihood of an impulse on the technical and economic effect of

the output of the sensor 12, you can control the implementation of the proposed device

The relationship between the failure times is due to the possibility of a model-malfunctioning maintenance of the failures of the servicing device. Pa.

Claims (1)

DEVICE FOR MODELING THE APPLICATION SERVICE PROCESS WITH VARIOUS PRIORITIES by ed. St. No. 962969, characterized in that, in order to expand the functionality of the device by simulating failures of the service device, it additionally contains a random pulse sensor and a trigger, and the output of the random pulse sensor is connected to a counting input of the trigger, the single output of which is connected to the third inputs of the first and second elements And, and the zero output of the trigger is connected to the inputs enable the operation of pulse generators with a random V interval interval.