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排序方式: 共有69条查询结果,搜索用时 14 毫秒
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Minh Ngoc Dinh David Abramson Chao Jin Andrew Gontarek Bob Moench Luiz DeRose 《Software》2015,45(4):501-526
Contemporary parallel debuggers allow users to control more than one processing thread while supporting the same examination and visualisation operations of that of sequential debuggers. This approach restricts the use of parallel debuggers when it comes to large scale scientific applications run across hundreds of thousands compute cores. First, manually observing the runtime data to detect error becomes impractical because the data is too big. Second, performing expensive but useful debugging operations becomes infeasible as the computational codes become more complex, involving larger data structures, and as the machines become larger. This study explores the idea of a data‐centric debugging approach, which could be used to make parallel debuggers more powerful. It discusses the use of ad hoc debug‐time assertions that allow a user to reason about the state of a parallel computation. These assertions support the verification and validation of program state at runtime as a whole rather than focusing on that of only a single process state. Furthermore, the debugger's performance can be improved by exploiting the underlying parallel platform because the available compute cores can execute parallel debugging functions, while a program is idling at a breakpoint. We demonstrate the system with several case studies and evaluate the performance of the tool on a 20 000 cores Cray XE6. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Dynamic slicing is a promising trace based technique that helps programmers in the process of debugging. In order to debug a failed run, dynamic slicing requires the dynamic dependence graph (DDG) information for that particular run. The two major challenges involved in utilizing dynamic slicing as a debugging technique are the efficient computation of the DDG and the efficient computation of the dynamic slice, given the DDG. In this paper, we present an efficient debugger, which first computes the DDG efficiently while the program is executing; dynamic slicing is later performed efficiently on the computed DDG, on demand. To minimize program slowdown during the online computation of DDG, we make the design decision of not outputting the computed dependencies to a file, instead, storing them in memory in a specially allocated fixed size circular buffer. The size of the buffer limits the length of the execution history that can be stored. To maximize the execution history that can be maintained, we introduce optimizations to eliminate the storage of most of the generated dependencies, at the same time ensuring that those that are stored are sufficient to capture the bug. Experiments conducted on CPU‐intensive programs show that our optimizations are able to reduce the trace rate from 16 to 0.8 bytes per executed instruction. This enables us to store the dependence trace history for a window of 20 million executed instructions in a 16‐MB buffer. Our debugger is also very efficient, yielding slicing times of around a second, and only slowing down the execution of the program by a factor of 19 during the online tracing step. Using recently proposed architectural support for monitoring, we are also able to handle multithreaded programs running on multicore processors. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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基于PVM的动态可伸缩并行调试器设计 总被引:2,自引:0,他引:2
PVM(parallel virtual machine)正在被越来越广泛地使用,但PVM应用程序的并行调试还是一个有待解决的难题。文中介绍了自行设计的基于PVM的动态可伸缩并行调试器ddbg,主要内容包括并行调试界面、总体设计和一些关键的实现技术。ddbg与其它已有的消息传递并行调试器相比,最大特点是其动态可伸缩结构,它能根据应用的需要自动分布调试服务。 相似文献
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本文介绍了在嵌入式调试器中如何通过以太网口进行嵌入式软件调试,实现了主机与开发板之间的网口通信。针对具体的嵌入式开发板$3C4510B对网口驱动和网络协议进行了研究,裁减了网口驱动和网络协议的冗余部分,既保证了调试器可以通过以太网进行远程调试,又能满足嵌入式系统对资源占用的要求。 相似文献
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并行计算机软件是并行机系统发展应用的一个薄弱环节。本文介绍了作者对几种不同类型并行机软件所做的研究与实践工作,并据此总结出几个基于部分共享存贮器结构提高并行软件开发与运行效率的原则和实现方法。 相似文献
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吴光龙 《安徽工业大学学报》2002,19(4):329-331
介绍了在Linux操作系统下,编译和调试C语言程序的工具GCC编译器、GDB调试器的使用方法等,并以例说明。 相似文献
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