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Device to model systems of mass service

Device to model systems of mass service
IPC classes for russian patent Device to model systems of mass service (RU 2447496):
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FIELD: information technology.

SUBSTANCE: device contains seven AND gates, two triggers, three OR gates, two OR-NO gates, random-number generator, two groups of AND gates with N gates in each group where N is equal to number of digits in decrement counter, two decrement counters and clock generator.

EFFECT: providing possibility to operate low priority request till completion after termination of high priority request operation because its operation continues from the moment after suspending.

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The invention relates to the field of computer technology, is used to simulate the service process two streams of applications with different priorities and can be used in devices that simulate systems of mass service.

A device for simulation of Queuing systems [SU # 1325561 U1, class G06F 15/20, 1987.07.23]containing stream generator applications, counter applications, counter claims received a denial of service, block random time delays, reversing the count of occupied channels, and a reversible counter of the queue length, the four elements And three elements of the ban, two OR element.

A disadvantage of the known device is limited application in electronic modeling for the study of real systems of mass service for maintenance heterogeneous incoming tasks.

Closest to the claimed is a device for simulation of process service requests with different priorities [SU # 962969 U1, class G06F 15/20, 1982.09.30], contains two pulse generator with a random interval repetition, the three elements, two trigger element of the ban and bootstrap diode, and sign applications high priority connected to the first input of the first element And whose output is connected to the first input of the first trigger input of the first pulse generator with a random interval repetition and the control input of the second pulse generator with a random interval repetition, the output of the first pulse generator with a random interval repetition is the first output device and connected to the first input of the third element And the second input of the first flip-flop, the first output of which is connected to the second input of the first element And the second output is connected with the control input element of the ban, an information input connected to the output of the second element, And an output connected to the first input of the second trigger and through restrictive diode to the output of the third element And the input of the start of the second pulse generator with a random interval repetition whose output is the second output device and connected to the second input of the second trigger, the first output of which is connected to a second input of the third element, And a second output connected to one input of the second element And the other input of which is the entrance applications low priority.

The disadvantage of this device is that at high intensity of receipt of service requests high priority in relation to applications for the low priority service last may never end, as if the application is a high priority during service applications low priority service last stops, and upon termination of the application of high priority maintenance the ICES application low priority resumes first, and does not continue from the date of suspension.

The technical result is to enable the service before the end of the application low priority despite the high arrival rate to service requests high priority, because at the end of service requests high priority service request low priority continues from the time after the suspension of the service.

The technical result is achieved in that the device for simulation of process service requests with different priorities, containing three elements And two triggers, and sign applications high priority connected to the first input of the first element And whose output is connected to the first input of the first flip-flop, the second output of which is connected to the second input of the first element And the second output of the second trigger is connected to one input of the second element And the other input of which is the entrance applications low priority, added three element OR two elements ILINE, the four elements And two subtractive counter, two groups elements And N elements in each group, where N is the number of digits subtractive counter, a random numbers generator and clock generator pulses, the output of which is connected to the combined first inputs of the third, fourth, sixth and sedimo the elements And the first and second groups of elements And, the second output of the first flip-flop connected to the second input of the third element And the third input of the second element And whose output is connected to the second input of the second trigger and the second input of the first element OR the first input of which is connected to the first input of the first flip-flop and the output to the sensor input random number, the output of which is connected to information inputs of the first and second groups of elements And the first output of the first flip-flop connected to the second input of the first group of elements And the second input of the sixth element, And whose output is connected to the second input of the first trigger and is the first output, second output, which is connected to the output of the seventh element And the second input of the second trigger, the first output of which is connected to the second input of the seventh element And the second input of the second group of elements And information outputs of which are connected to information inputs of the second subtractive counter, the counting input of which is connected to the output of the fifth element And the first input of which is connected to the output of the third element And the second input of the fifth element And is connected to the output of the third element OR group of inputs of which are connected to the outputs of the second subtractive counter 7.2 and the group of inputs of the second element ILINE 4.2, the output of which is connected to the third input of the seventh element And the third is the move of the second group of elements, And information outputs of the first group of elements And connected to information inputs of the first subtractive counter, the counting input of which is connected to the output of the fourth element And the second input is connected to the output of the second element OR group of inputs of which are connected to the outputs of the first subtractive counter and the group of inputs of the first element ILINE, the output of which is connected to the third input of the sixth element And the third input of the first group of elements I.

The introduction of these additional elements and the sequence of their connections allow for the possibility of service before the end of the application low priority despite the high arrival rate to service requests high priority, because at the end of service requests high priority service request low priority continues from the time after termination of service.

Figure 1 shows the functional diagram of the device.

The device comprises (1) seven elements And 1.1 1.7..., two trigger 2.1 and 2.2, the three elements OR 3.1...3.3, two elements ILINE 4.1, 4.2, sensor 5 random numbers, two groups of elements And 6.1 and 6.2, two subtractive counter 7.1 and 7.2 and the clock 8.

The device contains seven elements And 1.1 1.7..., two trigger 2.1, 2.2, three elements OR 3.1...3.3, two elements ILINE 4.1, 4.2, datsik random number two groups of elements And 6.1 and 6.2 elements And N elements in each group, where N is the number of digits subtractive counter, two subtractive counter 7.1 and 7.2 and the clock 8, the application of high priority connected to the first input of the first element And 1.1, the output of which is connected to the first input of the first trigger 2.1, the second output of which is connected to the second input of the first element And 1.1, the second output of the second trigger 2.2 is connected to one input of the second element And 1.2, the other input of which is the entrance applications low priority, the generator output clock pulses 7 is connected to the combined first inputs of the third 1.3, 1.4 fourth, sixth 1.6 and seventh 1.7 elements And first and 6.1 and 6.2 second group of elements And the second output of the first trigger 2.1 is connected to the second input of the third element And 1.3 and the third input of the second element And 1.2, the output of which is connected to the second input of the second trigger 2.2 and the second input of the first element OR 3.1, the first input of which is connected to the first input of the first trigger 2.1, and the output to the input of the sensor 5 random numbers, the output of which is connected to information inputs of the first 6.1 and 6.2 second group elements And the first output of the first trigger 2.1 is connected to the second input 6.1 first group of elements And the second input of the sixth element And 1.6, the output of which is connected to the WTO is th input of the first trigger 2.1 and is the first output device, the second output of which is connected to the output of the seventh element And 1.7 and the second input of the second trigger 2.2, the first output of which is connected to the second input of the seventh element And 1.7 and the second input 6.2 second group of elements And information outputs of which are connected to information inputs of the second subtractive counter 7.2, the counting input of which is connected to the output of the fifth element And 1.5, the first input of which is connected to the output of the third element And 1.3, the second input of the fifth element And 1.5 is connected to the output of the third element OR 3.3, the group of inputs of which are connected to the outputs of the second subtractive counter 7.2 and the group of inputs of the second element ILINE 4.2, the output of which is connected to the third input of the seventh element And 1.7 and a third input 6.2 second group of elements And information outputs 6.1 first group of elements And connected to information inputs of the first subtractive counter 7.1, the counting input of which is connected to the output of the fourth element And 1.4, the second input is connected to the output of the second element OR 3.2, the group of inputs of which are connected to the outputs of the first subtractive counter 7.1 and the group of inputs of the first element ILINE 4.1, the output of which is connected to the third input of the sixth element And 1.6 and a third input 6.1 first group of elements I.

Verbal model of the device is as follows. Two random flux is and requests for services come on one service unit. Streams of service calls are random pulse sequence, the intervals between which are distributed in a certain (different or same) laws.

Applications for service with a lower priority are accepted for service in the absence of applications with a higher priority.

Requests of the same priority, received at the time of employment of the service device, the service refuses. If the application with a higher priority is received during service applications with a lower priority, then the service application with a lower priority is suspended, and is served by the application with a higher priority. After the release of the maintenance device maintenance adopted previously to service requests with a lower priority continues.

The model of the maintenance device is the sensor 4 random numbers. The distribution law of random numbers at its output may be different or the same for each application, as it models the service time of the application.

The device can operate in three modes: service applications low priority service requests high priority service requests high priority is received during service applications low priority.

The device operates as follows. the initial state in all three modes triggers 2.1 and 2.2 are installed in position, in which the outputs connected to the second input of the first element And 1.1 and the first input of the second element And 1.2, there is a high potential, and outputs subtractive counter 7.1 and 7.2 shall be issued a code of zero. It is assumed that after issuing a random number sensor 5 random numbers is set to zero.

Service applications low priority

The pulses from input applications low priority device, proceed to the second input of the second element And 1.2, and with its output to the first input of the second trigger 2.2, that translates into a position in which the second element And 1.2 is closed until the end of the service applications. Arrived at this point of the application with sign applications low priority for service is not accepted and is lost. The pulse output of the second element And 1.2 through the first element OR 3.1 runs the sensor 5 random numbers, which generates a random number. Formed according to a certain law random number through the open 6.2 second group of elements And is supplied to the information input of the second subtractive counter 7.2 and clock pulse generator 8 is written in it. With outputs of the second subtractive counter 7.2 to the inputs of the third element OR 3.3 and the second element ILINE 4.2 will be given a code number, not zero. Prohibiting signal from the output of the second element ILINE 4.2 arrives on-thirds of the entrance 6.2 second group of elements And it closes. On each clock pulse received from the generator 8 through 1.3 third and fifth 1.5 elements And to the counting input of the second subtractive counter 7.2, you are subtracting a unit from its recorded value. As soon as the value of the second subtractive counter 7.2 becomes equal to zero, which indicates the completion of the service request via the third 3.3 and the fifth element OR 1.5 element And the counting input of the second subtractive counter 7.2 closes. With outputs of the second subtractive counter 7.2 code of zero is supplied to the inputs of the third element OR 3.3 and the second element ILINE 4.2. The output signal from the second element ILINE 4.2 is supplied to the third input of the seventh element And 1.7 and the third entrance 6.2 second group of elements And opens it. To clock pulse generator 8, the outputs of the sixth element And 1.6 output device and to the second input of the second trigger 2.2, turning it to its original state, which opens the second element And 1.2. When receiving input of the next application low priority device, the service process is repeated.

Service requests high priority

The pulses from input applications high priority device, proceed to the first input of the first element And 1.1, and with its output to the first input of the first trigger 2.1, that translates into a position in which the first 1.1 and 1.2 second elements And grivaud until the end of the service the requests of high priority. Arrived at this point of the application with login requests of high priority and low priority to the service will not be accepted and will be lost. The pulse output of the first element And 1.1 through the first element OR 3.1 runs the sensor 5 random numbers, which generates a random number. Formed according to a certain law random number through the open 6.1 first group of elements And is supplied to the information input of the first subtractive counter 7.1 and clock pulse generator 8 is written in it. With outputs of the first subtractive counter 7.1 inputs of the second element OR 3.2 and the first element ILINE 4.1 will be given a code number, not zero. Prohibiting the output signal of the first element ILINE 4.1 is supplied to the third input 6.1 first group of elements And it closes. On each clock pulse received from the generator 8 through the fourth 1.4 element And at the counting input of the first subtractive counter 7.1, you are subtracting a unit from its recorded value. As soon as the value of the first subtractive counter 7.1 becomes equal to zero, which indicates the completion of the service request via the second 3.2 element OR 1.4 and fourth element And the counting input of the first subtractive counter 7.1 closes. With outputs of the first subtractive counter 7.1 code of zero is supplied to the inputs of the second element OR 3.2 and the first element ILINE. The output signal of the first element ILINE 4.1 is supplied to the third input of the sixth element And 1.6 and the third entrance 6.2 second group of elements And opens it. To clock pulse generator 8, the outputs of the sixth element And 1.6 output device and to the second input of the first flip-flop 2.1, turning it to its original state, in which the first 1.1 and 1.2 second elements And. When receiving input from another application high priority device, the service process is repeated.

Service requests high priority received in the period of service applications low priority

The application of low priority input through open items And 1.2 OR 3.1 runs a random number sensor 5 and opens the second trigger 2.2. The random numbers generator 5 generates a random number, which through the open second group 6.2 elements And is written in the second subtractive counter 7.2. To clock pulses from generator 8 through the open items And 1.3 and 1.5 is the subtraction unit with the second subtractive counter 7.2 service applications low priority.

The application of high priority received from the input device before the end of the service applications low priority, through the open items And 1.1 OR 3.1 runs a random number sensor 5 and opens the first trigger 2.1. The signal from the second output p is pout trigger 2.1 1.1 first, second 1.2 and 1.3 third elements And are closed until the end of the service the requests of high priority. Through the closed 1.3 third element And the pulse generator 8 is fed to the counting input of the second subtractive counter 7.2. (the simulated suspension of service requests with low priority). In this state, the device is held until the end of the service requests with high priority. After the appearance of the pulse at the output of the sixth element And 1.6, simulating the end of the service requests of higher priority, tipped the first trigger 2.1, opening the first 1.1, 1.2 second and third 1.3 items I. Through outdoor 1.3 third element And the pulse generator 8 is coming to the counting input of the second subtractive counter 7.2. Thus simulates the continuation of the service requests with low priority, interrupted by the arrival of a high priority application. After the appearance of the pulse at the output of the sixth element And 1.6, the device returns to its original state.

By repeated application of high priority input device before the end of the low-priority service requests maintenance again suspended and then resumed after the end of the service requests high priority since after the suspension of the service. The operation is repeated Ana is ulichnym way. In the application of low priority will be for some time served.

Thus, the device allows the service before the end of the application low priority despite the high arrival rate to service requests high priority, because at the end of service requests high priority service request low priority continues from the time after the suspension of the service.

The device for simulation of process service requests with different priorities, containing three elements And two triggers, and sign applications high priority connected to the first input of the first element And whose output is connected to the first input of the first flip-flop, the second output of which is connected to the second input of the first element And the second output of the second trigger is connected to one input of the second element And the other input of which is the entrance applications low priority, characterized in that it additionally introduced three element OR two elements OR NOT, the four elements And two subtractive counter, two groups of elements And N elements in each group, where N is the number of digits subtractive counter, a random numbers generator and clock generator pulses, the output of which is connected to the combined first inputs of the third, even erego, the sixth and seventh elements And the first and second groups of elements And the second output of the first flip-flop connected to the second input of the third element And the third input of the second element And whose output is connected to the second input of the second trigger and the second input of the first element OR the first input of which is connected to the first input of the first flip-flop and the output to the sensor input random number, the output of which is connected to information inputs of the first and second groups of elements And the first output of the first flip-flop connected to the second input of the first group of elements And the second input of the sixth element, And whose output is connected to the second input of the first trigger and is the first output, the second output of which is connected to the output of the seventh element And the second input of the second trigger, the first output of which is connected to the second input of the seventh element And the second input of the second group of elements And information outputs of which are connected to information inputs of the second subtractive counter, the counting input of which is connected to the output of the fifth element And the first input of which is connected to the output of the third element And the second input of the fifth element And is connected to the output of the third element OR group of inputs of which are connected to the outputs of the second subtractive counter and the group of inputs of the second of the element OR NOT, the output of which the CSO is connected to the third input of the seventh element And to a third input of the second group of elements, And information outputs of the first group of elements And connected to information inputs of the first subtractive counter, the counting input of which is connected to the output of the fourth element And the second input is connected to the output of the second element OR group of inputs of which are connected to the outputs of the first subtractive counter and the group of inputs of the first element OR NOT, the output of which is connected to the third input of the sixth element And the third input of the first group of elements I.

 

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