NDLI: Visualising dynamic memory allocators

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Visualising dynamic memory allocators

Content Provider	ACM Digital Library
Author	Nystrom-Persson, J. Ayres, J. W. Dunn, N. Hayden, R. A. Field, A. J. Cheadle, A. M.
Abstract	We present generic extensions to the GCspy visualisation frame-work that make it suitable for tracking the way continuous dynamic memory allocators such as dlmalloc or incremental and concurrent garbage collectors make use of heap memory. These extensions include sample-driven client-server communication, in-cremental stream updates and client-controlled stream update frequency. Additional extensions to the current GCspy client are also described. These include hierarchical driver grouping and hierarchical visualisation, zooming, and the ability to define and view relationships between tiles in different spaces. We also introduce a heuristics engine that is responsible for flipping GCspy from its decoupled 'observation' mode to a synchronous 'single-step' mode, and describe a backtrace facility that can trace the server-side call sequence that led to the triggering of a specified event, such as the allocation or freeing of a block of memory. This enables aspects of the allocator (fragmentation, block ordering, splitting and coalescing policies, etc.) to be understood in the context of a particular application and potential optimisations to be identified. The effectiveness of the enhanced framework is demonstrated with a complete integration with dlmalloc. The framework is evaluated in terms of both performance and its ability to explore contrived modifications to dlmalloc's coalescing policy.
Starting Page	115
Ending Page	125
Page Count	11
File Format	PDF
ISBN	1595932216
DOI	10.1145/1133956.1133972
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2006-06-10
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Garbage collection Dynamic memory allocation Language implementation Memory management Visualisation of objects
Content Type	Text
Resource Type	Article

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