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Eliminating object reference checks by escape analysis on real-time Java virtual machine

CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND APPLICATIONS 2019年第4-Sup期22卷 S9323-S9334页

作者： Feng, Wei Shi, Xiaohua Wang, Wenru Beihang Univ Sch Comp Sci & Engn State Key Lab Software Dev Environm Beijing Peoples R China

The real-time specification for Java (RTSJ) makes Java to be a real-time programming language. However, the RTSJ's memory management system is more complicated than J2SE's. The assignment rules of RTSJ, which prevent the creation of dangling references, must be checked by real-time Java virtual machines (JVMs) at run-time. These frequent run-time object reference checks introduce significant time overheads and unpredictable execution time, which has great impact on real-time systems. This paper presents an equivalence class based, context sensitive and flow insensitive escape analysis algorithm that effectively eliminates unnecessary run-time reference checkpoints of RTSJ programs. The optimization framework has been implemented in an open-source real-time JVM namely jRate and evaluated by CDx, a relative authority real-time Java benchmark suite. The results show that this optimization algorithm eliminates more than 90% static reference checkpoints, removes about 50% run-time reference checkpoints on average, and improves the run-time performance of average 3.13%, max 8.93%.

关键词： Escape analysis object reference check Real-time Java

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Optimizing object reference checks on Real-time Java Virtual Machine 6

Optimizing Object Reference Checks on Real-time Java Virtual...

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6th IEEE International Conference on Software Engineering and Service Science (ICSESS)

作者： Feng, Wei Shi, Xiaohua Yu, Hengyang Beihang Univ Sch Comp Sci & Engn Beijing Peoples R China

ISBN: (纸本)9781479983537

Thanks to Real-Time Specification for Java (RTSJ), Java now can be applied in real-time systems. However, in RTSJ's memory management system, assignment rules which aimed to prevent the creation of dangling references must be checked by real-time Java virtual machines (JVMs) at runtime. These frequent runtime object reference checks lead to additional time overhead and unpredictable running time, which has great impact on real-time systems. This paper presents an equivalence class based, context sensitive and flow insensitive escape analysis algorithm which could eliminate unnecessary runtime reference checkpoints. This optimization framework has been implemented in an open-source real-time JVM jRate 0.3.7.2-3.3.3 and evaluated by CDx, a relative authority real-time Java benchmark suite. The results show that this optimization algorithm eliminates 94.92% static reference checkpoints, on average removes 42.28%similar to 54.44% runtime reference checkpoints, and improves the runtime performance of average 3.13%, max 8.93%.

关键词： Escape analysis object reference check real-time Java virtual machine RTSJ

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Optimizing object reference checks on Real-time Java Virtual Machine

Optimizing Object Reference Checks on Real-time Java Virtual...

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2015 6th IEEE International Conference on Software Engineering and Service Science(ICSESS 2015)

作者： Wei Feng Xiaohua Shi Hengyang Yu School of Computer Science and Engineering Beihang University

Thanks to Real-Time Specification for Java(RTSJ), Java now can be applied in real-time systems. However, in RTSJ’s memory management system, assignment rules which aimed to prevent the creation of dangling references must be checked by real-time Java virtual machines(JVMs) at runtime. These frequent runtime object reference checks lead to additional time overhead and unpredictable running time, which has great impact on real-time systems. This paper presents an equivalence class based, context sensitive and flow insensitive escape analysis algorithm which could eliminate unnecessary runtime reference checkpoints. This optimization framework has been implemented in an open-source real-time JVM j Rate 0.3.7.2-3.3.3 and evaluated by CD, a relative authority real-time Java benchmark suite. The results show that this optimization algorithm eliminates 94.92% static reference checkpoints, on average removes 42.28%4.44% runtime reference checkpoints, and improves the runtime performance of average 3.13%, max 8.93%.

关键词： Escape analysis object reference check real-time Java virtual machine RTSJ

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