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The Monitor panel comprises 3 sections. The top most
section contains a real time graph illustrating the
realm memory usage in the same way the Realm
Status panel displays memory usage. This section
also contains a summary showing the number of mounted
realms, the number of channels, the number of queues
and the number of services.
The image below demonstrates the Monitor panel for
a clustered realm.
Channel Usage
The middle section of the Monitor panel displays a
table showing multiple columns and rows. This table
represents channel usage throughout the realm. Each
row in the table represents a channel. Channel usage
can be measured a number of ways. Each measurement corresponds
to a column within the table. By clicking on one of
the column headers, all known channels will be sorted
according to their value for the selected column. For
example, one of the columns is 'Connections', i.e. the
number of current consumers on the channel. By clicking
on the column header labelled 'Connections', the table
will be sorted according to the number of consumers
each channel has. The channel with the most number of
consumers will appear at the top of the table.
Each column used for channel usage measurements is
described below:
Connections - The number of consumers
the channel has
Published - The rate of events published
per status interval
Consumed - The rate of events consumed per
status interval
Memory (bytes) - The number of bytes the
channel uses from the JVM memory
% Memory - The percentage of overall JVM
memory used by this channel
Disk - The amount of disk space used by this
channel, only relevant for persistent / mixed channels
Connection Usage
The bottom section of the monitor panel shows a similar
table to that of the channel usage table described above,
except that this table represents connection usage.
Each row represents a connection. A connection corresponds
to the physical aspect of a Nirvana Session. Connection
usage, like channel usage can be measured in a number
of different ways. Each column in the table represents
a type of measurement for a realm connection. Clicking
on one of the column headers will cause the table of
connections to be sorted according to the value of the
selected column. For example, one of the columns is
'Events In', i.e. the number of events sent to the server
by the connection. By clicking on the column header
labelled 'Events In', the table will be sorted according
to the number of events each connection has sent to
the server. The connection with the most 'Events In'
count will appear at the top of the table.
Each column used for connection usage measurements
is described below:
Queued- The number of event in the
connections outbound queue
Events In - The rate of events sent by the
connection to the realm server
Bytes In - The rate of bytes sent by the
connection to the realm server
Events Out - The rate of events consumed
by the connection from the realm server
Bytes Out - The rate of bytes consumed by
the connection from the realm server
Latency - The measured time it takes the
connection to consume events from the server, i.e.
time taken between leaving the realm server and being
consumed by the connection.
Monitor Graphs
The monitor panel provides a method of graphing both
channel and connection usage. It uses a 3D graph package
from sourceforge
to display the items in each table as columns in a 3D
vertical bar chart. The bar charts can be update live
as the values in the tables are updated. Once a column
is selected, simply click on the button labelled 'Bar
Graph' under either the channel or connections table
and a graph panel will appear, as shown in the image
below showing a graph of the number of events published
for channels within a realm..
Right-clicking anywhere within the graph will show
a pop-up menu of options. One of the options is labelled
'Start Live Update', which will ensure the graph consumes
updates as and when they occur to the table. Once the
live update is started, you can also stop the live update
by once again right clicking on the graph and selecting
'Stop Live Update'.
You can also print the graph, and save the graph image
as a '.png' file, as well as alter the properties of
the graph and its axis. |
