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The authors propose EndoScope, a software monitoring framework that allows users to pose declarative queries that monitor the state and performance of running programs. Unlike most existing monitoring tools, EndoScope is acquisitional, meaning that it only instruments the portions of the program that need to be monitored to answer queries. The use of a high level declarative language allows EndoScope to search for efficient physical instantiations of queries by applying a suite of optimizations, including control flow graph analysis, and traditional database query optimization techniques, such as predicate pushdown and join optimization, to minimize the number of program instrumentation points and overhead to the monitored program.
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