System for detecting program phases with periodic call-stack...

Details System for detecting program phases with periodic call-stack... System for detecting program phases with periodic call-stack...

2008-04-17

2010-06-01

Wang, Philip (Department: 2191)

Data processing: software development, installation, and managem

Software program development tool

Testing or debugging

C707S813000

Reexamination Certificate

active

07730457

ABSTRACT:
A system for associating a phase with an activation of a computer program that supports garbage collection include: a plurality of stacks, each stack including at least one stack frame that includes an activation count; and a processor with logic for performing steps of: zeroing the activation count whenever the program creates a new stack frame and after garbage collection is performed; determining whether an interval has transpired during program execution; examining each stack frame's content and incrementing the activation count for each frame of the stacks once the interval has transpired; detecting the phase whose activation count is non-zero and associating the phase with the activation; and ensuring that when the phase ends, an action is immediately performed.Detecting phases in a running computer program, creates an activation count associated with each stack frame. The activation count is zeroed whenever a new frame is created in a stack and incremented for each frame encountered during periodic intervals. A phase is detected with an activation whose activation count is non-zero.

REFERENCES:
patent: 6505344 (2003-01-01), Blais et al.
patent: 6557091 (2003-04-01), Houldsworth
patent: 6684392 (2004-01-01), Eidt
Paul R. Wilson and Thomas G. Moher, “Design of the Opportunistic Garbage Collector” Electrical Engineering & Computer Science Dept., University of Illinois at Chicago, Oct. 1-6, 1989.
Thomas Kistler and Michael Franz, “Computing the Similarity of Profiling Data. Heuristics for Guiding Adaptive Compilation” Department of Information & Computer Science, University of California at Irvine, 1998.
Henry Lieberman and Carl Hewitt “A Real-Time Garbage Collector Based on the Lifetimes of Objects” Programming Techniques and Data Structures, Jun. 1983.
Trishul M. Chilimbi and Martin Hirzel, Dynamic Hot Data Stream Prefetching for General-Purpose Programs, 2002.

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