NDLI: On the sensitivity of cooperative caching performance to workload and network characteristics

Content Provider	ACM Digital Library
Author	Sahu, Sambit Venkatramani, Chitra Lee, Kang-Won Amiri, Khalil
Abstract	A rich body of literature exists on several aspects of cooperative caching [1, 2, 3, 4, 5], including object placement and replacement algorithms [1], mechanisms for reducing the overhead of cooperation [2, 3], and the performance impact of cooperation [3, 4, 5]. However, while several studies have focused on quantifying the performance benefit of cooperative caching, their conclusions on the effectiveness of such cooperation vary significantly. The source of this apparent disagreement lies mainly in their different assumptions about workload and network characteristics, and about the degree of cooperation among caches.To more comprehensively evaluate the practical benefit of cooperative caching, we explore the sensitivity of the benefit of cooperation to workload characteristics such as object popularity distribution, temporal locality, one time referencing behavior, and to network characteristics such as latencies between clients, proxies, and servers. Furthermore, we identify a critical workload characteristic, which we call average access density, and show that it has a crucial impact on the effectiveness of cooperative caching.In this extended abstract, we report on a few important results selected from our extensive study reported in [6]. In particular, assuming an LFU-based cache management policy, we arrive at the following conclusions. First, cooperative caching is only effective when the average access density (defined as the ratio of the number of requests to the number of distinct objects in a time window) is relatively high. Second, the effectiveness of cooperative caching decreases as the skew in object popularity increases. Higher skew means that only a small number of objects are most frequently accessed reducing the benefit of larger caches, and therefore of cooperation.
Starting Page	268
Ending Page	269
Page Count	2
File Format	PDF
ISSN	01635999
DOI	10.1145/511399.511374
Journal	ACM SIGMETRICS Performance Evaluation Review (PERV)
Volume Number	30
Issue Number	1
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-01-10
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Hardware and Architecture Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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