• The Transactions of the Korea Information Processing Society
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• v.6 no.1
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• pp.225-233
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• 1999

One of the reasons that debugging distributed programs is much more difficult than sequential programs is the communication among processes. Even though there are many debuggers constructed on distributed system environment, no available debugger provides an efficient way to debug communication events.. In this paper, we show the way to debug RPC communication, which is regarded as one of the most popular communication protocol in distributed system development. This paper presents the implementation of the RPC event trace function based on the RPC event model, which is proposed to accommodate communication events into debugging objects. Analyzing conventional RPC protocols, we formalized library function calls as corresponding actions to sending and receiving of messages. B recognizing the locations of library calls the debugger can detect all occurrences of communication events, This RPC event trace function is implemented on the on-line distributed debugger UniVIEW system.

• The Journal of Korean Association of Computer Education
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• v.23 no.4
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• pp.61-68
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• 2020

The purpose of this study is to develop a debugging task to support process-centered assessment on software(SW) education and to develop a service site. Achievement criteria for programming in elementary and middle school SW curriculum consists of control structures such as repetition and condition, and elements such as variables and input/output. In order to apply the process-centered assessment presented by the Ministry of Education, it is necessary to present tasks that can be used in the actual classroom environment and to consider connection with achievement levels. Therefore, in this study, 12 tasks for elementary school and 15 tasks for middle school were developed as debugging tasks and their validity was verified. As a result of conducting Delphi verification for validity, it was found that the level and content of the debugging task are appropriate. In addition, as a result of verifying the usability of the debugging challenge site by applying a heuristic evaluation method, it was found that it is suitable for use in the real educational field.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.4
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• pp.84-92
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• 2002

As today's field programmable gate arrays have very large logic capacity as well as relatively fast operation speed, they're widely used in many application areas. However, debugging the design implemented in FPGA's is very time-consuming and painful as the internal signal probing usually requires large number of FPGA re-compilations, which take tremendously long time. In this paper, we analyze the problems in FPGA debugging and propose a new powerful debugging solution. With the proposed FPGA debugging solution, we can guarantee not only to provide 100% internal signal visibility without FPGA re-compilation for the design in FPGA's, but also to identify at least one design bug per FPGA compilation. An experimental result has clearly shown the proposed approach to FPGA debugging very powerful and practical.

• The Transactions of the Korea Information Processing Society
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• v.5 no.5
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• pp.1225-1233
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• 1998

An important issue for software developers is to determine when to stop testing the software system and release it to users. Generally the release time is specified by the number of detected faults or the testing time needed to meet the reliability requirement. Software reliability directly depends on the number of remaining or corrected faults. All the detected faults are not always corrected under imperfect debugging environment. We therefore need a new approach to software release policy for imperfect debugging. This paper suggests a software release policy, which guarantees that the reliability requirement has been achieved. The suggested policy is then implemented and illustrated for specific SRGMs.

• Journal of Korea Game Society
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• v.11 no.2
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• pp.131-140
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• 2011

Debugging is very important element in programming development. We can find a lot of bug of program we made, and we can fix it. but after a product is released, we need system we can catch bugs as soon as possible. For this, we need to know post-mortem debugging. We will look at post-mortem debugging, and we will talk about process dump. Also when process get the problem, we should get the process dump, but we can have situation process dump was not generated. We will consider this case, and we will examine programming technique which this case can be retrieved. Finally, I will introduce EHModule(exception handler module)

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.778-780
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• 2005

최근 가정, 자동차, 사무실등 많은 장소에서 임베디드 장치를 쉽게 찾아볼 수가 있다. 이렇듯 많은 분야에서 임베디드 장치가 사용됨에 따라 임베디드 시스템 제조업자들은 보다 빠른 시간에 많은 분야에 적용 가능한 임베디드 소프트 웨어를 개발해야 하는 어려움이 생겼다. 이러한 어려움은 소프트웨어 개발시간을 줄일 수 있도록 도와주는 개발환경의 필요성을 증가시켰다. 개발도구 중 디버깅도구는 개발시간의 대부분을 차지하는 디버깅 과정을 도움으로써 개발시간 단축이 큰 역할을 한다. 기존 디버깅도구는 모든 변수에 대한 데이터 추출을 하기 위하여 자원사용량과 처리량을 증가 시킴으로써 많은 부하를 발생시킨다. 이에 모니터링에 의한 부하를 최소화하기 위하여 변수 값을 추출하기 위한 모니터링 센서 기법과 실행시간 중 모니터링 대상을 변경하기 위한 디버깅레벨기법을 사용하여 소프트웨어의 내부 변수가 동작하면서 발생되는 오류를 검출할 수 있는 임베디드 모니터링 시스템을 설계 및 개발하였다. 하지만 실행시간 모니터링 중에 센서의 동작과정에 따르는 부하로 인하여 정확하지 않은 데이터를 추출할 수 있는 문제점이 발생되었다. 이러한 문제를 해결하기 위해 본 논문에서는 센서의 수행과정을 최소화하도록 센서 처리 구조를 변경하고 최적화된 센서 구조의 실행시간을 줄이기 위해 비트마스킹 기법을 사용한다.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.9
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• pp.424-433
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• 2001

The cyclic debugging approach often fails for message passing parallel programs because they non-deterministic characteristics due to message race conditions. This paper identifies the MPI events that affect non-deterministic executions, and then converts the concurrent execution to the sequential one that is controlled in order to make it equivalent to a reference execution by keeping their orders of events in two executions identical. This paper also presents an efficient algorithm for the causal distributed breakpoint which is initiated by any sequential breakpoint in one process, and restores each process to the earliest state that reflects all events that happened causally before the sequential breakpoint. So a cyclic debugging approach can be used in debugging MPI parallel programs as like as in debugging sequential programming environments.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.4
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• pp.737-743
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• 2008

I compare my parameter estimation methodoloay with existing method, considering both of testing effort and fault detecting rate simultaneously in software reliability modeling. Generally speaking, fault detection/removal mechanism depends on how apply previous fault detection/removal and testing effort of S/W. The fault removal efficiency makes large influence to the reliability growth, testing and removal cost in developing stage S/W. This is very useful measure during all the developing stages and much helpful for the developer to estimate debugging efficiency, and furthermore, to anticipate additional working amount.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.391-394
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• 2022

최근 한국을 포함한 여러 국가들에서 프로그래밍 교육이 중요시 되고 있다. 그러나 이런 상황으로 인해 더 많아진 학생들은 미숙함으로 인해 숙련자에 비해 더 많은 오류를 만나지만 이를 해결하기 위한 디버깅 실력은 아직 미숙하다. 따라서 본 논문에서는 프로그래밍 교육 지원을 위한 초보자용 GUI 디버깅 도우미 UDB (Unity-DeBugger)를 제안한다. UDB는 제출한 학생 코드를 분석하여 반응형 추적표와 오류 로그를 생성하고 이를 기반으로 GUI 및 애니메이션으로 만들어 학생과 상호작용한다. 특히 UDB는 반응형 추적표를 통해 프로그램 안에 있는 변수들의 현재 상태를 보여주고 순방향 추적뿐만 아니라 기존 IDE의 디버깅 도구들과는 다르게 역방향 추적이 가능하다는 큰 특징이 있다. 이런 UDB를 예시 코드에 실제로 적용한 결과를 통해 미숙한 학생도 역방향 추적 기능을 사용하여 오류 원인을 쉽게 찾을 수 있음을 보인다.

• The KIPS Transactions:PartA
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• v.12A no.7 s.97
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• pp.583-588
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• 2005

To develop SoC program for embedded systems, a tool that can remotely debug from host system is needed. Because the existing remote debugging systems using GDB don't offer information of the SoC program execution in real-time, it is difficult to observe condition of the program execution, and also they have limited characteristics to tools and use costly adaptors. In this paper, a real-time tracking tool that can record SoC status on the nv each execution of the assigned instructions is introduced and an economical USB-JTAG adaptor is proposed. And it is shown that this tool can track the execution of a composed program in the target system based on PXA255 processor.