DVS Clipster Guide de l'utilisateur Page 101

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The Tool Area
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You can switch between the two measurings with a setting available in
the Configuration Tool (see “CLIPSTER Configurations” user guide).
They and their effect on the drawn charts will be explained in the fol-
lowing.
The Chart in ’Overall File I/O Workload’
If the performance monitor is set to the ’overall file I/O workload’ set-
ting, the chart indicates the overall workload of the system during a
timed interval (40 ms).
Figure 4-21: Chart of performance monitor (overall file I/O workload)
With this setting you can find at the top left of the chart the value of
the last multi-threaded operation. It details in certain intervals during
operation the workload of all threads in percent, i.e. the value of one
bar in the chart.
At the top right of the chart you can find an indication about how many
frames were processed total and how many drops occurred during this
time.
When operating, the system’s workload is displayed via blue bars in the
chart. The bars may well reach the 100 % line during an operation
which does not necessarily mean that a drop may occur soon. It simply
shows that all threads of the software were processing continuously at
that point of time and that no thread was idle. Drops exceed the work-
load of the system shown in the chart. They are displayed as bars in red
that are cut at the top.
The Chart in ’Individual File I/O Duration’
If the performance monitor is set to the ’individual file I/O duration’
setting, the chart of the performance monitor shows the access times
of single files, which is especially useful when the system is operating in
Missing frames on the storage are not registered by the perfor-
mance monitor as drops.
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