scholarly journals Analysis of the use of the Redis in the distributed order processing system in the restaurant network

2021 ◽  
Vol 5 (2(61)) ◽  
pp. 39-43
Author(s):  
Valerii Tkachenko ◽  
Svetlana Lukianiuk
Keyword(s):  
Response Time ◽  
Query Language ◽  
Processing System ◽  
System Response ◽  
Heavy Load ◽  
Order Processing ◽  
System Response Time ◽  
The Subject ◽  
Distributed Order ◽  
Restaurant Chain

The object of research is a distributed order processing system for a restaurant chain. The subject of the research is the analysis of the use of Redis for managing event queues in distributed systems. When implementing a distributed order processing system in a restaurant chain with a possible load of up to 20,000 users per day, the Redis system was used. Management of 9 distributed subsystems was organized through Redis. This solution showed an increase in the performance of the system under heavy load (from 50 transactions per second), but the response time of the system in some cases of its operation was longer than without using Redis. When working systems using Redis, it is necessary to take into account the amount of data with which Redis will work, since it does not exceed the amount of RAM, the absence of differentiation into users and groups, and the absence of a query language, which is replaced by a key-value scheme. This research is aimed at analyzing the operation of the system during trial operation under real load. We compared the operation of a configured system with Redis enabled and disabled. The main indicators for the analysis were the system response time and the maximum request execution time. The research was carried out for 2 weeks, the first week using the system settings with disabled Redis, the second – with enabled Redis. We selected 2 days with a similar load on the system to each other. Especially indicative are the results of comparing the durations of the longest queries, which show an almost constant value of the duration for the system in the mode of enabled Redis. The hypothesis of an increase in the system response time at low loads was confirmed, but this value not only leveled off at a load of 500 unique users but also became less at loads of 1000 unique users.

Evaluation of Audio Response Time Delay Requirements for Digitized Audio

1989 ◽  
Vol 33 (4) ◽  
pp. 234-238 ◽  
Author(s):  
Paula M. Van Balen ◽  
Leslie R. Eisler
Keyword(s):  
Time Delay ◽  
Response Time ◽  
Time Delays ◽  
Response Times ◽  
System Response ◽  
System Response Time ◽  
The Subject ◽  
Different Response ◽  
Voice Data ◽  
Subject Performance

As digital voice data is increasingly replacing analog in system applications, user interface requirements supporting this technology must be established. This experiment was conducted to determine whether system response time affected a user's ability to control movement of recorded speech while keying in a verbatim report of the speech content. Experienced subjects performed a transcription task under four different response times. Upon completion of the task, the subject ordered the response times from shortest to longest and rank-ordered their preferences for response delay times. Performance data was collected to discover if response time differences affected performance. Subjects were unable to identify the response time delays correctly; and, based on the preference rankings, the subjects were most satisfied with a response time delay range between 100 ms and 150 ms and least satisfied with a response time delay of 250 ms. Subjects stated that with the longest and shortest response time delays they had trouble positioning in the audio. Response time delays did not affect subject performance, although other significant results were found.

scholarly journals Analysis of work load by computer system response time in different type of VDT tasks

1985 ◽  
Vol 21 (4) ◽  
pp. 211-217 ◽  
Author(s):  
Akinori KOMATSUBARA ◽  
Yoshimi YOKOMIZO ◽  
Sakae YAMAMOTO ◽  
Kageyu NORO
Keyword(s):  
Response Time ◽  
Computer System ◽  
Work Load ◽  
System Response ◽  
System Response Time

The Impact of Computer Assistance on District Office Operations

1979 ◽  
Vol 23 (1) ◽  
pp. 586-590
Author(s):  
L. Dan Massey ◽  
Jerry T. Lawler
Keyword(s):  
Cost Effectiveness ◽  
Response Time ◽  
Capital Investment ◽  
System Response ◽  
Computer Assisted ◽  
Social Security Administration ◽  
Potential Cost ◽  
Computer Assistance ◽  
System Response Time ◽  
The Impact

To predict the potential cost effectiveness of computer assisted information processing in the District Offices (DOs) of the Social Security Administration (SSA), we developed a model of manpower allocation in present DO operations. We adapted existing SSA management data sources to quantify this baseline model. We also constructed a description of the changes in manpower requirements expected to occur on introduction of a hypothetical computer assisted system. We used analyses of user functional requirements to determine overall system capabilities. We used the results of user performance trials on a simulated system to quantify this change model. Significant reductions in manpower for processing of individual claims in the DO appear to be attainable. Computer system response time was identified as a controllable design characteristic with a strong effect on manpower requirements. Introduction of computer assistance to the DO could free manpower from mechanical clerical activities for application to more creative and professional functions. This manpower could be applied to expansion of SSA services and to improvement of DO service quality. An overall increase of 25% to 33% in workload processing capacity appears potentially attainable with computer assistance at current DO manpower levels. Suitable workstations might be based on use of individual personal computers or on sharing the resources of a single larger machine among a number of users. Consideration of relative costs and benefits suggests that the personal computer approach, while initially more costly, offers better control over system response time, which can have a major effect on system acceptance and cost effectiveness. It is likely that computer assistance for DOs will be deployed through workstations based on individual personal machines. Full recovery of capital investment can potentially be achieved in two years of actual operation.

Computer System Response Time and Psychophysiological Stress II

1982 ◽  
Vol 26 (8) ◽  
pp. 698-702 ◽  
Author(s):  
Stuart Martin Weiss ◽  
George Boggs ◽  
Mark Lehto ◽  
Sogand Shodja ◽  
David J. Martin
Keyword(s):  
Response Time ◽  
Repeated Measures ◽  
Psychological Impact ◽  
Industrial Process ◽  
Interactive Systems ◽  
Upper And Lower Bounds ◽  
System Response ◽  
User Performance ◽  
Experimental Conditions ◽  
System Response Time

With the advent of time-shared interactive systems, the psychological impact of system response time (SRT) and SRT variability (SRTV) has become an important issue. Carbonell, et. al. (1968) have suggested that both SRT and SRTV may influence system user performance and satisfaction. A number of studies have been reported that address this issue, but results have been mixed. In this experiment, twenty subjects ( Ss) executed keyboard entries to control the temperature of a simulated industrial process via time-shared process control computer. Temperature was displayed in analog form on a CRT. The task was to maintain the temperature within upper and lower bounds that were clearly indicated on the display. The experimental design consisted of repeated measures with SRT and SRTV as experimental factors. Three SRT's were employed (2, 6 and 10 seconds) with two levels of SRTV (σ2 = 0 and σ2 = 0.33 seconds). Mean blood pressure (MBP) and heart rate (HR) were continuously monitored during experimental conditions. Task errors were defined as temperature excursions beyond the displayed bounds. Significant main effects were not obtained for MBP or HR. Significant differences for error rate (performance) were noted for SRT ( F(2, 15) = 23.10, p < .05), subjects x SRT ( F37, 15) = 1.66, p < .001), and SRT x SRTV ( F(1, 15) = 13.14, p < .05). Error data are consistent with the Carbonell et. al. suggestion that long and variable SRT may affect user performance. The results are discussed in terms of their incongruity with current literature.

Solving the Problem of Determining the Maximum Fault Tolerance of Distributed Information Processing Systems with a Limit on Their Reactivity

2020 ◽  
Vol 63 (6) ◽  
pp. 44-50
Author(s):  
Andrey Scoba ◽  
◽  
Vladislav Mikhaylov ◽  
Ayesh Achmed Nafea Ayesh ◽  
◽  
...  
Keyword(s):  
Information Processing ◽  
Fault Tolerance ◽  
Response Time ◽  
System Response ◽  
Queuing Network ◽  
Distributed Information ◽  
Reliability Characteristics ◽  
System Response Time ◽  
Network States ◽  
Stationary Probabilities

The use of exponential Queuing networks for calculating the reliability characteristics of distributed in-formation processing systems is proposed. This allows you to naturally tie the reliability characteristics of the system (failure rates) with its technical and operational characteristics (the average response time of the system to user requests). And also reduce the problem to calculating stationary probabilities of Queuing network States. The article formulates and solves the optimization problem of finding the maximum fault tolerance of distributed information processing systems implemented on the basis of a two-level and three-level client-server architecture with a fixed value of the average system response time to user requests. The problem of determining the fault tolerance indicators of distributed information processing systems is reduced to the problem of deter-mining the stationary probabilities of Queuing network States. The article presents the results of numerical ex-periments. The analysis of the obtained results shows the prospects of using these models to obtain estimates of the reliability characteristics distributed information processing systems in various subject areas.

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