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Browsing by Subject "Parallelization"

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    Efficient dynamic program monitoring on multi-core platforms.
    (2012-06) He, Guojin
    Software security and reliability have become increasingly important in the mod- ern world. An effective approach to enforcing software security and reliability is to monitor a program’s execution at run time. However, instrumentation-based imple- mentation of a dynamic program monitor on single-core systems suffers significant performance overhead. As multi-core architecture becomes more mainstream, im- plementing efficient dynamic program monitoring by assigning monitoring activities onto separate processor cores and thus reducing performance overhead becomes not only a feasible but an appealing way to enforce software security and reliability. To achieve efficient and flexible multi-core based dynamic program monitoring, however, three challenging issues must be carefully considered and adequately addressed: the hardware support, the monitoring model, and the parallelization of monitoring tasks. This dissertation proposes novel solutions to these challenging problems. The hardware support proposed in this dissertation, which is referred to as extraction logic, selectively extracts execution information from the monitored program and forwards it to a monitor running on a separate CPU core. The extraction logic is generic and configurable by the monitor so that it can support a large spectrum of monitoring tasks. Based on this generic hardware support, this dissertation proposes a novel monitoring model, referred to as the distill-based monitor model. Monitors in this execution model is generated by special compiler supports. The distill-based monitor model is based on the observation that a monitor needs only partial informa- tion from the monitored execution and that of this needed information, some can be easily computed by the monitor from other information that has already been com- municated. We implemented a code generator and optimization techniques to decide which set of information to forward and which set to compute so as to minimize the total execution time of the monitor. This compiler support can optimize a variety of monitors with diverse monitoring requirements, taking as input the control flow graph of the monitored program and the set of monitoring requirements. To parallelize monitoring tasks, this dissertation proposes a novel paralleliza- tion paradigm built on General-purpose Computing on Graphics Processing Unit (GPGPU) architecture. In the following chapters, we first propose a generic, purely software-based GPGPU monitor framework that is flexible enough to support par- allelization of various kinds of monitoring tasks. Furthermore, we propose software- based optimization techniques built on this framework that effectively take advantage of various characteristics of monitoring tasks such as taint-propagation and memory- bug detection, and thus achieve significant performance improvement. This dissertation reports the performance improvement achieved by the proposed monitoring model and parallelization paradigm. Relative to the performance of traditional instrumentation-based monitor for taint-propagation and memory-bug- detection, the proposed compiler support is able to bring down performance overhead by 3.7 times and 2.2 times for SPEC2006INT benchmarks. The proposed GPGPU- based monitor with optimization even achieves more for memory-bug detection, re- ducing performance overhead by 5.2 times.