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Found 5 results.
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TR-CS-2006-15
A Platform for Research into Object-Level Trace Generation
James Foucar
An object-level trace, which we will hereafter refer to as a garbage collection trace (GC-trace), enumerates all the events that happen during program execution that affect the heap. Therefore, GC-tracing is an excellent way to examine the behavior of an object-oriented system. Knowing behavior expedites many forms of virtual machine research including garbage collection research. GC-traces were originally generated by the painfully slow brute-force technique. Subsequently, this technique was replaced by the Merlin algorithm which can generate GC-traces at a fraction of the cost of the brute-force algorithm.
Our work introduces a new GC-tracing system. Our system uses the Merlin algorithm within the context of a general shadow heap that is independent of the virtual machine. The shadow heap supports many optimizations to the Merlin algorithm and also supports analysis and verification. We examine the advantages and disadvantages of our approach, the viability of using a C++ library for analysis in conjunction with a Java-in-Java virtual machine, the various costs of integrating our shadow heap with a virtual machine, and the effectiveness of our GC-tracing optimizations. Finally, we compare our GC-tracing system with the GC-tracing system that is currently bundled with JikesRVM.
TR-CS-2006-13
Design and Implementation of a Baseline port of the Jikes Research Virtual Machine to the IA-64 Architecture
Ravi kiran Gorrepati
Of all 64-bit architectures, IA-64 is the most recent and offers exciting new features for compiler developers. IA-64 gains speed from efficient compilation, which is costly for Java, because the compilation of modules happens dynamically on the virtual machine. Lack of an opensource Java virtual machine for the IA-64 which allows for research on code generation techniques lead us to pursue this work. This work presents a baseline code generator for the IA-64 architecture. This code generator is a part of the Jikes Research Virtual Machine for Java written in Java. To our knowledge, this work presents the first open-source, just-in-time virtual machine for Java on IA-64 architecture.
TR-CS-2003-41
Jikes Research Virtual Machine: Design and Implementation
of a 64-bit PowerPC Port
Sergiy Kyrylkov
This work describes the design and implementation of a 64-bit PowerPC port of the Jikes Research Virtual Machine (Jikes RVM). It explains general design decisions for 64-bit implementations of Java virtual machines, specifically Jikes RVM, along with details of the specific 64-bit PowerPC implementation.
TR-CS-2003-40
A Tool for Monitoring and Recording Heap-Allocated Object Behavior
Qingfeng Duan
A tool, to be used for monitoring and recording the heap-allocated object behavior, is designed, implemented, evaluated, and documented. Object-oriented programming languages, such as Java, require the support of automatic memory management (garbage collection), because of their intensive heap allocation. Modern garbage collection techniques rely on exploiting the object behaviors. These behaviors include the ages, the types, and the sizes of objects, and the references among objects. For example, the Appel generational copying collector and the Older-First collector are built on the basis of the distribution of object ages. To understand these object behaviors and thus be able to improve garbage collection techniques, we need a simulation tool. The tool described here correlates the low-level read-write data accesses with the high-level object characteristics. When an object is allocated, modified, moved, or deallocated, the tool monitors and records this information. By further analyzing this information, one obtains the relevant data to understand the desired object behaviors. The tool consists of three components: IBM's Jikes RVM, Dynamic SimpleScalar, and an off-line Analyzer. Jikes RVM is a Java virtual machine which itself is written in Java; Dynamic SimpleScalar is a machine-level emulator to simulate a PowerPC model running the AIX operating system; and the Analyzer is used to postprocess the results generated by the first two components. To be running, the entire tool maintains a layering of structures: the Java program, Jikes RVM, Dynamic SimpleScalar, and the host machine, in which the Java program resides at the first layer. We evaluate our tool using three SPECjvm98 Java benchmarks. We also illustrate how the tool can be used to analyze the write statistics to the fields of an object with certain class type. In general, this tool could have great significance in garbage collection research, by being able to provide accurate and flexible analyses at the heap-allocated object level.
TR-CS-2003-38
Design and Implementation of SIND, a Dynamic Binary Translator
Trek Palmer
Recent work with dynamic optimization in platform independent, virtual machine based languages such as Java has sparked interest in the possibility of applying similar techniques to arbitrary compiled binary programs. Systems such as Dynamo, DAISY, and FX$!$32 exploit dynamic optimization techniques to improve performance of native or foreign architecture binaries. However, research in this area is complicated by the lack of openly licensed, freely available, and platform-independent experimental frameworks. SIND aims to fill this void by providing an easily-extensible and flexible framework for research and development of applications and techniques of binary translation. Current research focuses are dynamic optimization of running binaries and dynamic security augmentation and integrity assurance.
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