Chapter 4 - DSpace at Waseda University
Chapter 4 - DSpace at Waseda University
Chapter 4 - DSpace at Waseda University
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It is very useful for these purposes.<br />
� To understand the system problems.<br />
31<br />
<strong>Chapter</strong> 3<br />
� To analyze system performance by the monitoring system and applic<strong>at</strong>ion program.<br />
� To analyze the communic<strong>at</strong>ion network among processes.<br />
Moreover, LTTng is different with strace [69] or gprof [70] or Dtrace [18] in th<strong>at</strong> it shows<br />
whole system including inside of the kernel.<br />
By using LTTng, we can copy and record the events occurring inside of the kernel such as<br />
thread, fork, interrupt, signal, and memory inform<strong>at</strong>ion, etc. from the kernel space to user<br />
space quickly. In addition to using LTTV (Linux Trace Tool Viewer) [3] [5], we can record<br />
and review the event log visually, and the overhead is reduced from 1.54 to 2.28 [3].<br />
Figure 3.5: LTTV viewer’s execution<br />
Figure 3.5 shows LTTV after event logging. It provides time inform<strong>at</strong>ion by the nanosecond.<br />
In addition, it analyzes each CPU’s event.
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