SU855667A1 - Device for simulating mass service systems - Google Patents

Description

I

The invention relates to computing technology and can be used to study the quality and efficiency of the operation of queuing systems (QS), as well as automated control systems and data processing reference systems.

A device for simulating queuing systems is known, comprising a generator, a driver of an input stream of pulses, a shift register, an encoder, a counter, a statistical processing unit. The controlled input of the shift register is connected to the Lervo output of the generator, the second output of which is connected through the frequency divider to the output of the shift register, and the counter outputs through the encoder are connected to the statistical processing unit. This device allows the formation of an input flow of non-uniform requirements

The disadvantage of the device is the inability to model different in quality service.

requirements.

The closest in technical essence to the proposed is

a device for simulating queuing systems, containing input requirements generators, dial pad, reversible counters, which are connected via AND to the requirements generators, a control word register, a decoder, whose inputs are connected to the outputs of the register, and outputs are connected via AND elements the inputs of the elements OR. With this device, you can simulate CMC with different priorities, requirement 2.

15

However, this device inaccurately and relatively slowly reproduces the actual processes of the functioning of the QS. In addition, it does not allow for determining the costs of servicing requirements in channels with unequal quality services. In the study of modern QS, the quality of

25 operation of the service channels, and the revenues obtained for the quality of service are an important part of the effectiveness of the QS.

The purpose of the invention is to improve the accuracy and speed of the device.

The goal is achieved by the fact that a device for simulating queuing systems containing a flow generator, the first output of which is connected to the distributor input, a second output of the flow generator, is connected to the first input of the service time interval generator, the output of which is connected to the first input of the unit. delays, the first output of which is connected to the input of the first decoder, the second and third outputs of the delay block are connected to the inputs of the first block of counters, the second decoder is entered, the block bans, a second block of meters and a block of quality of service indicators, the output of which is connected to the input of the second decoder, the first output of which is connected to the second input of the service time interval generator, the output of the distributor is connected to the first input of the block of bans, the output of which is connected to the second input of the block delays, the first output of the first decoder is connected to the second input of the prohibition element block, the second outputs of the first and second decoder and the output of the first block of connection counters here, respectively, with the inputs of the second block of meters.

The drawing shows a block diagram of an apparatus for simulating queuing systems.

The device contains a generator of random event streams 1, a converter 2, a shaper 3 servicing time intervals, a distributor 4, a prohibition block 5, a delay block 6, a first block 7 of counters, a second block 8 of counters, first and second decoders 9 and 10, a task block 11 service quality indicators; generator 1 and converter 2 form a flow generator 12.

Generator 1 contains functional units of typical sensors of random streams of pulses. The intensities of Poisson fluxes are changed using a thinning operation. Transducer 2 includes logical elements And triggers. The necessary characteristics of random streams are set by selecting the appropriate structure of the converter 2 or adjusting the parameters of its components. The first output of the converter 2 is connected to the input of the imaging unit 3, and the second output is connected to the input of the distributor 4. The imaging unit 3 contains integrating elements, for example, operational amplifiers in the integrated mode, as well as electronic switches. Electronic keys are used to meter the charge of capacitive elements in chains.

feedback operational amplifiers. The distributor 4 is a typical shift register on the potential elements and serves to receive information about the input pulse stream. In addition, the distributor 4 performs a shift (shift) of the input pulse flow in the direction from the devices with a higher quality of service to the devices with a lower quality of service. The output of the distributor 4 is connected to the first input of the block 5 prohibition elements. Block 5 consists of BANLE logic elements, the number of which is equal to the number of QM servicing devices in block 6. The servicing devices of block 6 use time delay circuits controlled by signals received at the n + 1th inputs from the imager 3 servicing time intervals. Models The service devices are combined according to the block diagram examined by the QS. At the same time, the quality of service decreases with an increase in the sequence number of the servicing device. The first and second outputs of block 6 are connected to the inputs of block 7 (reversible counters). The third output of block 6 is connected to the input of the decoder 9. The decoder 9 contains universal logic elements OR NOT that can be performed, for example, on MIS transistors. The inputs of the OR-NOT elements receive signals from the outputs of the servicing devices of block 6, which are some variables, i 1,2, ... n and their negation. Moreover, the variables x correspond to free servicing devices, and to their negatives x.j correspond to the servicing devices of unit 6. The output of the decoder 9 is connected to the input of the unit 8 of counters. The block 8 of counters contains typical pulse counters, which are divided into three groups. The first group consists of counters for recording the durations of simply servicing devices due to the absence of a charge. The second group of counters is used to register the service duration by devices of the unit 6 of the incoming request (requirements). The third group of counters is intended for the accumulation of pulses, the number of which is proportional to the quality of service. Each counter of the indicated groups is assigned to the corresponding servicing device.

Claims (2)

1. USSR author's certificate I 636614, cl. G 06 F 15/20, 1976. 2. Authors certificate of the USSR 590748, cl. G 06 F 1b / 20, 1975 (prototype).