NDLI: Lightweight Java Profiling with Partial Safepoints and Incremental Stack Tracing

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Lightweight Java Profiling with Partial Safepoints and Incremental Stack Tracing

Content Provider	ACM Digital Library
Author	Hofer, Peter Mössenböck, Hanspeter Gnedt, David
Abstract	Sampling profilers are popular because of their low and adjustable overhead and because they do not distort the profile by modifying the application code. A typical sampling profiler periodically suspends the application threads, walks their stacks, and merges the resulting stack traces into a calling context tree. Java virtual machines offer a convenient interface to accomplish this, but rely on safepoints, a synchronization mechanism that requires all threads to park in a safe location. However, a profiler is primarily interested in the running threads, and waiting for all threads to reach a safe location significantly increases the overhead. In most cases, taking a complete stack trace is also unnecessary because many stack frames remain unchanged between samples. We present three techniques that reduce the overhead of sampling Java applications. Partial safepoints require only a certain number of threads to enter a safepoint and can be used to sample only the running threads. With self-sampling, we parallelize taking stack traces by having each thread take its own stack trace. Finally, incremental stack tracing constructs stack traces lazily and examines each stack frame only once instead of walking the entire stack for each sample. Our techniques require no support from the operating system or hardware. With our implementation in the popular HotSpot virtual machine, we show that we can significantly reduce the overhead of sampling without affecting the accuracy of the profiles.
Starting Page	75
Ending Page	86
Page Count	12
File Format	PDF
ISBN	9781450332484
DOI	10.1145/2668930.2688038
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-01-28
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Stack trace Java Profiling Safepoints Calling context tree Sampling Monitoring
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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