Multiprocessor scheduling with client resources to improve the response time of WWW applications

Andresen, Daniel; Yang, Tao

doi:10.1145/263580.263603

Cited by 8 publications

(6 citation statements)

References 12 publications

(9 reference statements)

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“…This is typically done in one of four ways: increasing the capacity of the system for example by using server farms or multiprocessor machines [20,22]; using caches either on the client or on the server side [26,15,13]; designing more efficient software both at the OS level [34,7,23,29] and the application level [37], and admission control [17,44]. Other means of avoiding overload are content adaptation [1] and offloading work to the client [3].…”

Section: Related Workmentioning

confidence: 99%

Web servers under overload: How scheduling can help

Schroeder¹,

Harchol-Balter²

2003

Teletraffic Science and Engineering

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Most well-managed web servers perform well most of the time. Occasionally, however, every popular web server experiences transient overload. An overloaded web server typically displays signs of its affliction within a few seconds. Work enters the web server at a greater rate than the web server can complete it, causing the number of connections at the server to build up. This implies large delays for clients accessing the server. This paper provides a systematic performance study of exactly what happens when a web server is run under transient overload, both from the perspective of the server and from the perspective of the client. Second, this paper proposes and evaluates a particular kernel-level solution for improving the performance of web servers under overload. The solution is based on SRPT connection scheduling. We show that SRPT-based scheduling improves overload performance across a variety of client and server-oriented metrics.

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Section: Related Workmentioning

confidence: 99%

Web servers under overload: How scheduling can help

Schroeder¹,

Harchol-Balter²

2003

Teletraffic Science and Engineering

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“…There are some studies focused on web responsiveness [2,8,17]. Olshefski and others have proposed an approach to measuring the client perceived response time more accurately [17], but have not explored how the perceived response time a↵ects end users' satisfaction.…”

Section: Related Workmentioning

confidence: 99%

SatScore

Zhao

Zhou

Shen

2014

Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing

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Important for user experience on mobile devices, app launch responsiveness has received many recent attentions. This paper reveals a principled pitfall in previous studies. Most of these studies have used average reduction of response delays as the metric for responsiveness. Through a systematic user study and statistical analysis, this paper shows that the metric fails to faithfully reflect user experienced responsiveness. To avoid the pitfall, a straight-forward solution is to employ users' direct feedback as the responsiveness metric, which is unfortunately hard to obtain. This paper presents the promise of solving the dilemma through a SatScore model. It further demonstrates some new opportunities for responsiveness enhancement enabled by the SatScore model.

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“…Dynamic policies, on the other hand, rely on adapting the traffic workload or the operation of the resource, based on the level of overload. These polices are typically employed via load-balancers [11], [12], admission controllers [13], [14], [15], [16], schedulers [17], [18] and content adaptation controllers [3], [4], [5]. Load balancers and schedules typically do not mitigate overload directly but aim to improve the response time for clients by making judicious decisions.…”

Section: Related Workmentioning

confidence: 99%

Assessment of Vulnerability of Content Adaptation Mechanisms to RoQ Attacks

Guirguis

Tharp

Bestavros

et al. 2009

2009 Eighth International Conference on Networks

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Abstract-Current computing systems employ different mechanisms to deal with overload conditions. Of those widely deployed are content adaptation mechanisms whereby the quality level of the content is adapted dynamically to mitigate overload conditions. Serving degraded content reduces strain on resources and enables them to cater for a larger set of clients. To that end, this paper studies adversarial exploits of dynamic content adaptation mechanisms to a new instantiation of Reduction of Quality (RoQ) attacks. The RoQ attack pattern is orchestrated to cause different forms of damage such as longer response time for legitimate clients, degraded content being served and underutilization of resources. We assess the impact of RoQ attacks via the potency metric which reflects the tradeoffs between the damage inflicted and the cost in mounting the attack. We validate our results through numerical analysis as well as real Internet experiments.

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Multiprocessor scheduling with client resources to improve the response time of WWW applications

Cited by 8 publications

References 12 publications

Web servers under overload: How scheduling can help

Web servers under overload: How scheduling can help

SatScore

Assessment of Vulnerability of Content Adaptation Mechanisms to RoQ Attacks

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