Chapter 4 - DSpace at Waseda University

impossible to analyze every problem by the tool.
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Chapter 4
An analysis tool is changed according to development environment. If the main purpose is
network analysis, there are well-known tools such as ethereal [72], MRTG, and Ntop. In
addition, there are open resource programs such as Nagios and JFFNMS [71]. There are
nmon, strace, and many other usable tools for memory or other monitoring tools.
Undoubtedly, before solving problems by using mentioned tools, it is syslog [48] that can be
very simply checked in Linux. Mostly, log is recorded in /var/log/message but by changing
established value in /etc/syslog.conf log can be saved in a certain place. Syslog file is a text-
based message log recorded by the syslog daemon. By watching this file periodically, it is
possible to trace important hint on common system stability such as lack of disk space,
memory lack, I/O error, device failure.
As mentioned above, although there are analysis tools and event logging tools, these tools
only have ability to save logged event information in a text or to show them in a viewer.
Therefore, in this thesis we propose KAS which can analyze the cause of a problem quickly
and efficiently by using even information that has been logging.
4.2 Kernel Analysis System
Normally, kernel analysis tools show or output status information of kernel (CPU
utilization, memory information, time information, etc.) in text type. Sometimes, an event
that has been logging is displayed by using a viewer which makes it easier for a developer or
an administrator to see. However, the analysis is not easy for a developer and a system
administrator. In a case of text mode, it is difficult to find out where the problem has occurred