NDLI: Scalability limitations when running a Java web server on a chip multiprocessor

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Scalability limitations when running a Java web server on a chip multiprocessor

Content Provider	ACM Digital Library
Author	Ogasawara, Takeshi
Abstract	In this paper, we consider scalability problems for a Java-based Web server running on a CMP (chip multiprocessor). We found that the performance of the Web server scaled poorly as the number of threads increased, even though the CPUs were not fully utilized. Searching for the causes of this scalability problem, we found that the normal use of the Web server was a poor fit to the object lifetimes a JVM expects. A relatively small fraction of objects that were long-lived but not permanent resulted in frequent scans of all of the live objects. They increased not only the load on the CMP but also the number of Web responses that failed to meet the response time criteria for the server. In addition, we found that the performance of the GC scaled poorly as the number of parallel GC threads increased in the CMP. The long-lived objects tax the CMP, and this is emerging as a general problem for CMPs running Java-based Web servers. To address the problem, we used object pooling for these classes to recycle the instances rather than cycling the memory through the GC. We achieved a 48% improvement in the scalability with this object pooling. We also improved the throughput by 9% by using object pooling for large short-lived objects, even though object pooling is not recommended for use in modern JVMs. We show which data classes affect the GC overheads based on the detailed analysis of object lifetimes. We also show that thread affinity is important for the object pools of these classes.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781605589084
DOI	10.1145/1815695.1815703
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-05-24
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Jvms Multi-cores Web servers Performance
Content Type	Text
Resource Type	Article

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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