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检索条件"主题词=Java virtual machine"

共 273 条记录，以下是161-170 订阅

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Analysis of Denial-of-Service Attack Vectors in Software Defined Networks 12

Analysis of Denial-of-Service Attack Vectors in Software Def...

引用

12th International Conference on Cyber Warfare and Security (ICCWS)

作者： Portante, Anthony Mullins, Barry Air Force Inst Technol Wright Patterson AFB OH 45433 USA

ISBN: (纸本)9781911218265

Software Defined Networking is a new emerging technology that is quickly gaining popularity amongst the largest corporations. However, this new networking paradigm has a centralized point of failure at the controller. With this choke point it is imperative that it be designed with security at the forefront. This paper aims to shed light on one of the possible ways that having a centralized point of failure in the network can provide malicious attackers an avenue to disrupt an entire enterprise network. Two experiments are performed. The first experiment is performed to confirm a discovered vulnerability in a hardware switch. The second, to see if simply generating fake malicious software switches on the network is enough to inflate the JVM Heap to capacity and cause the controller to crash. These tests are conducted using enterprise grade servers and SDN enabled hardware switches. All trials conducted to confirm the discovered vulnerability concluded with a 100% success rate and revealed the cause of the vulnerability was due to the switch not following standards set forth by the Open Networking Foundation. The experiment performed to test the possibility of inflating the JVM Heap to capacity concluded with a 0% success rate. However, prolonged intermittent Denial-of-Service was achieved by causing the Garbage Collector to stop performing Young Generation Garbage Collections and to perform Full Garbage Collections exclusively. This transition to exclusive Full Garbage Collections, was a result of the attack inflating the heap memory allocated to the Floodlight controller. The system reached a point where the only way the Garbage Collector could keep the heap from running out of memory was by performing Full Garbage Collections. Moreover, the execution of Full Garbage Collections grew in both frequency and duration. As well, the time spent per Full Garbage Collection began exceeding one second, compared to thousandths of a second during normal operation. The mean tot

关键词： software defined networks network attack java virtual machine denial-of-service

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Metrics for multithreaded java program verification

Metrics for multithreaded Java program verification

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International Conference on Software Engineering Research and Practice (SERP 05)

作者： Salem, A Sharma, V Calif State Univ Sacramento Dept Comp Sci Sacramento CA 95819 USA

ISBN: (纸本)1932415513

All multithreaded programs are inherently less predictable. In order to find the relationship between thread execution and memory allocation, one must understand the java Memory Model (JMM). The JMM model is introduced in this paper to understand thread execution. The deterministic replay approach is shown based on the past and ongoing research to understand logical scheduling and interleaving of the threads. The aim of this paper is to investigate an approach of verifying a multithreaded java programs with the use of metrics and the knowledge of JMM.

关键词： program verification concurrent programs java virtual machine java Memory Model pre analyzer program

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Profiling and Tracing Support for java Applications 19

Profiling and Tracing Support for Java Applications

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10th ACM/SPEC International Conference on Performance Engineering (ICPE)

作者： Nisbet, Andy Nobre, Nuno Miguel Riley, Graham Lujan, Mikel Univ Manchester Sch Comp Sci Manchester Lancs England

ISBN: (纸本)9781450362399

We demonstrate the feasibility of undertaking performance evaluations for JVMs using: (1) a hybrid JVM/OS tool, such as a sync-profiler, (2) OS centric profiling and tracing tools based on Linux perf, and (3) the Extended Berkeley Packet Filter Tracing (eBPF) framework where we demonstrate the rationale behind the standard offwaketime tool, for analysing the causes of blocking latencies, and our own eBPF-based tool bcc-java, that relates changes in microarchitecture performance counter values to the execution of individual JVM and application threads at low overhead. The relative execution time overheads of the performance tools are illustrated for the DaCapo-bach-9.12 benchmarks with Open-JDK9 on an Intel Xeon E5-2690, running Ubuntu 16.04. Whereas sampling based tools can have up to 25% slowdown using 4kHz frequency, our tool bcc-java has a geometric mean of less than 5%. Only for the avrora benchmark, bcc-java has a significant overhead (37%) due to an unusually high number of futex system calls. Finally, we provide a discussion on the recommended approaches to solve specific performance use-case scenarios.

关键词： ebpf profiling java virtual machine

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Performance evaluation of embedded garbage collectors in CVM environment

Performance evaluation of embedded garbage collectors in CVM...

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11th International Conference on Knowledge-Based Intelligent Informational and Engineering Systems/17th Italian Workshop on Neural Networks

作者： Chal, Chang-Il Kim, Sang-Wook Chang, Ji-Woong Shin, Miyoung Hanyang Univ Dept Informat & Commun Seoul South Korea Korea Polytech Univ Dept Game & Multimedia Engn Seongnam Si South Korea Kyungpook Natl Univ Sch Elect Engn & Comp Sci Daegu South Korea

ISBN: (纸本)9783540748175

Garbage collection in the java virtual machine is a core function that relieves application programmers of difficulties related to memory management. In this paper, we evaluate the performance of GenGC and GenRGC, garbage collectors for the embedded java virtual machine, CVM. To compare the performance of GenGC and GenRGC, we first evaluate the execution time of garbage collection and the delay time caused by garbage collection. Second, for more detailed performance analysis of GenRGC, we evaluate the execution time of garbage collection and the delay time caused by garbage collection while changing the sizes of a block and a frame. Third, we analyze the size of storage space required for performing GenRGC, and show GenRGC to be suitable for embedded environment with a limited amount of memory. Since CVM is the most representative one of embedded java virtual machines, this performance study is quite meaningful in that we can predict the performance of garbage collectors in real application environments more accurately.

关键词： java java virtual machine garbage collection CVM

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Evaluating HTM for pauseless garbage collectors in java 14

Evaluating HTM for pauseless garbage collectors in Java

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13th IEEE International Symposium on Parallel and Distributed Processing with Applications

作者： Carpen-Amarie, Maria Dice, Dave Marlier, Patrick Thomas, Gael Felber, Pascal Univ Neuchatel Neuchatel Switzerland Oracle Labs Austin TX USA Telecom SudParis Paris France

ISBN: (纸本)9781467379526

While garbage collectors (GCs) significantly simplify programmers' tasks by transparently handling memory management, they also introduce various overheads and sources of unpredictability. Most importantly, GCs typically block the application while reclaiming free memory, which makes them unfit for environments where responsiveness is crucial, such as real-time systems. There have been several approaches for developing concurrent GCs that can exploit the processing capabilities of multi-core architectures, but at the expense of a synchronization overhead between the application and the collector. In this paper, we investigate a novel approach to implementing pauseless moving garbage collection using hardware transactional memory (HTM). We describe the design of a moving GC algorithm that can operate concurrently with the application threads. We study the overheads resulting from using transactional barriers in the java virtual machine (JVM) and discuss various optimizations. Our findings show that, while the cost of these barriers can be minimized by carefully restricting them to volatile accesses when executing within the interpreter, the actual performance degradation becomes unacceptably high with the just-in-time compiler. The results tend to indicate that current publicly available HTM mechanisms (such as Intel Haswell) cannot be readily used to implement a pauseless GC in java that can compete with state-of-the-art concurrent GCs.

关键词： Garbage Collection Hardware Transactional Memory java virtual machine

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Vectorized Intrinsics Can Be Replaced with Pure java Code without Impairing Steady-State Performance 24

Vectorized Intrinsics Can Be Replaced with Pure Java Code wi...

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15th ACM/SPEC International Conference on Performance Engineering (ICPE)

作者： Loff, Junior Schiavio, Filippo Rosa, Andrea Basso, Matteo Binder, Walter Univ Svizzera Italiana Fac Informat Lugano Switzerland

ISBN: (纸本)9798400704444

Several methods of the java Class Library ( JCL) rely on vectorized intrinsics. While these intrinsics undoubtedly lead to better performance, implementing them is extremely challenging, tedious, error-prone, and significantly increases the effort in understanding and maintaining the code. Moreover, their implementation is platform-dependent. An unexplored, easier-to-implement alternative is to replace vectorized intrinsics with portable java code using the java Vector API. However, this is attractive only if the java code achieves similar steady-state performance as the intrinsics. This paper shows that this is the case. We focus on the hashCode and equals computations for byte arrays. We replace the platform-dependent vectorized intrinsics with pure-java code employing the java Vector API, resulting in similar steady-state performance. We show that our java implementations are easy to fine-tune by exploiting characteristics of the input (i.e., the array length), while such tuning would be much more difficult and cumbersome in a vectorized intrinsic. Additionally, we propose a new vectorized hashCode computation for long arrays, for which a corresponding intrinsic is currently missing. We evaluate the performance of the tuned implementations on four popular benchmark suites, showing that the performance are in line with those of the original OpenJDK 21 with intrinsics. Finally, we describe a general approach to integrate code using the java Vector API into the core classes of the JCL, which is challenging because premature use of the java Vector API would crash the JVM during its fragile initialization phase. Our approach can be adopted by developers to modify JCL classes without any changes to the native codebase.

关键词： Compiler Intrinsics SIMD Vector Instructions java Vector API Portability java virtual machine

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A Comparative Study of JVM Implementations with SPECjvm2008

A Comparative Study of JVM Implementations with SPECjvm2008

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2nd International Conference on Computer Engineering and Applications

作者： Oi, Hitoshi Univ Aizu Dept Comp Sci Aizu Wakamatsu Fukushima Japan

ISBN: (纸本)9780769539829

SPECjvm2008 is a new benchmark program suite for measuring client-side java runtime environments. It replaces JVM98, which has been used for the same purpose for more than ten years. It consists of 38 benchmark programs grouped into eleven categories and has wide variety of workloads from computation-intensive kernels to XML file processors. In this paper, we will compare two proprietary java virtual machines (JVMs), HotSpot of Sun Microsystems and JRockit of Oracle, using SPECjvm2008 on three platforms that have CPUs with the same microarchitecture but different clock speed and cache hierarchies. The wide variations of the SPECjvm2008 benchmark categories, together with the differences in hardware configurations of the platforms, reveal the strong and weak points of each JVM implementation. In the composite SPECjvm2008 performance metrics, JRockit performs 19 to 27% better than HotSpot. This is the results of JRockit's outperforming HotSpot in nine out of eleven categories. However, JRockit is quite weak in JVM initialization as it is revealed from the executions of startup. helloworld;the relative performance of JRockit can be as low as 19% of HotSpot. Another remarkable result is, JRockit runs scimark. monte_carlo much faster (up to 285% of HotSpot) which affects the performance metrics of three categories. The relatively higher performances of JRockit on non-startup benchmarks likely to be the differences in number of x86 instructions executed in JVMs, with exceptions in compiler.* benchmarks. In startup.* benchmarks, the performance differences should also be due to the numbers of x86 instructions executed, but their effects widely vary from benchmark to benchmark.

关键词： java virtual machine Workload Analysis Performance Evaluation

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Application-Assisted Dynamic Attestation for JVM-Based Cloud 15th

Application-Assisted Dynamic Attestation for JVM-Based Cloud

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15th International Conference on Algorithms and Architectures for Parallel Processing (ICA3PP)

作者： Ba, Haihe Zhou, Huaizhe Wang, Zhiying Ren, Jiangchun Hong, Tie Li, Yiming Natl Univ Def Technol Coll Comp Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783319271613;9783319271606

In the recent years, cloud computing has expanded rapidly and improved the working efficiency for a number of cloud users, however, a few enterprises hesitate to move to the cloud because of the runtime security challenges of applications although cloud vendors promise to provide a trustworthy execution platform. In this paper, we propose Trusted Cloud Root Broker to give robust trustworthy guarantees to those JVM-Based applications. The broker as the application-root of the trust is to make the evaluation of the runtime trustworthiness and support dynamic attestation about the integrity state of an application with the assistance of java virtual machine. It could not just prove the authenticity but also offer the availability for these targeting applications. What is more, our broker has less performance overheads.

关键词： Cloud computing java virtual machine Dynamic attestation Runtime trustworthiness

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Combinatorial interaction testing of a java Card static verifier

Combinatorial interaction testing of a Java Card static veri...

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7th IEEE International Conference on Software Testing, Verification and Validation (ICST)

作者： Calvagna, Andrea Fornaia, Andrea Tramontana, Emiliano Univ Catania Dipartimento Matemat & Informat I-95124 Catania Italy

ISBN: (纸本)9780769551944

We present a combinatorial interaction testing approach to perform validation testing of a fundamental component for the security of java Cards: the byte code verifier. Combinatorial testing of all states of the java Card virtual machine has been adopted as the coverage criteria. We developed a formal model of the java Card byte code syntax to enable the combinatorial enumeration of well-formed states, and a formal model of the byte code semantic rules to be able to distinguish between well-typed and ill-typed ones, and to derive actual test programs from them. A complete framework has been implemented, enabling fully automated application and evaluation of the conformance tests to any verifier implementation.

关键词： Software engineering combinatorial interaction testing java virtual machine

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LLjava Live at the Loop A Case for Heteroiconic Staged Meta-programming 18

LLJava Live at the Loop A Case for Heteroiconic Staged Meta-...

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18th ACM SIGPLAN International Conference on Managed Programming Languages and Runtimes (MPLR)

作者： Widemann, Baltasar Trancon y Lepper, Markus Nordakademie Elmshorn Germany Semantics GmbH Berlin Germany

ISBN: (纸本)9781450386753

This paper investigates the use of staged meta-programming techniques for the transparent acceleration of embedded domain-specific languages on the java platform. LLjava-LIVE, the staged API of the low-level JVM language LLjava, can be used to complement an interpreted EDSL with orthogonal and extensible compilation facilities. Compiled JVM bytecode becomes available immediately as an extension of the running host program. The approach is illustrated with a didactic structured imperative programming language, WHILST.

关键词： embedded domain-specific languages compiler construction staged meta-programming java virtual machine class loading

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