Chapter 4 - DSpace at Waseda University

Chapter 3
In Figure 3.4, through Mevalet viewer’s execution, a user can check a lot of information such
as the process name and CPU processing time and Inter-Process Communications (IPC).
Finally, there is a utility problem, NMON [22] from IBM. Generally, NMON is very useful
to monitor a system because it shows a lot of information rather than order top in Linux. You
can download it at the IBM homepage. NMON has designed for Linux professions to
monitor performance and analyze AIX Operation system.
It provide mainly these information
� CPU using information
� Memory using information
� Ratio of disk I/O, transfer, ratio of R/W
� Free storage of file system
� Ration of network I/O, transfer, ratio of R/W
Based on information, NMON output draws a graph, and makes a graphic file.
3.4 Linux Trace Toolkit next generation
Through the executing trace, LTTng [3] [5] [20] [32] [39] [42] [59] analyzes the system
exactly. Executing traces shows a lot of information such as task handling time, period, an
assigned process information. In addition, it calculates the delay time of application programs
or the time for a certain program to read disk.
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