CANoe DENoe - KEMT FEI TUKE

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display functions are reduced to provide more computing time for internal data processing.
When the high-load limit of the ring buffer is exceeded, the display of messages in
the Trace window is interrupted briefly under load operation to provide other analysis
blocks with more computing power. However, it is possible that not all messages will
be displayed in the window any longer during the measurement. You can recognize
this load situation during the measurement by an exclamation point (!) in the first column
of the window. Although not all messages are shown, no data are lost. After you
stop the measurement, the entire set of information is available to you in the Trace
window, Graphic window and in logging.
2.5.2 Behavior with Data Loss
If the ring buffer overruns in spite of these measures, as a user you are immediately
informed of this data loss:
An occurring data loss is registered in ASCII logging. The ‘*’ symbol appears in the
line after which the data loss occurred. In the configuration dialog for the Log file the
Lost Data Message Box option also allows you to have a data loss shown in a separate
message window at the end of measurement.
The Bus Statistics window also indicates to you a data loss during an overload situation
with the @ symbol. However, please note that the display of bus load and received
messages continue to function properly, since this information is provided by
the interface card and does not need to be computed by the main program first. Consequently,
the Bus Statistics display allows you to estimate the extent of the data
loss.
2.5.3 Fill Level Indicator
To allow you to observe the ring buffer between the real-time library and the main
Windows program more precisely, the program has a fill level indicator.
You can view the fill level during the measurement in the left corner of the status bar.
If the ratio between arriving and processed events is balanced, the indicator has a
green color. However, if it appears in red, significantly more events are arriving than
can be processed at the given time. This is a clear indication that the system is overloaded.
If the queue fill level reaches an alarming limit, the system attempts to relieve
the load by selectively deactivating individual evaluation windows. If desired, you can
have the queue's state displayed with the help of the entry ShowMainQueue=0 in the
[System] section of the CAN.INI file.
You can also have the fill level displayed in the Write window. To do this, set a minimum
value of WriteLevel = 3 in the [Environment] section of the CAN.INI
file. Then, when the ring buffer overflows the Write window shows the report "Load
transition: NORMAL->DATA LOST" and informs you of the data loss. After the
overload situation has ended (e.g. after a brief burst on the bus) you are similarly
informed as soon as a normal situation has been restored. You can recognize this in
the Write window by the report "Load transition: QUEUE HIGH -> NORMAL".
© Vector Informatik GmbH CANoe/DENoe Manual Version 4.1.1