The Performance panel contains a chart with two basic performance statistics: a number of running jobs and an amount of used heap memory. The graph displays values gathered within a specific interval. The interval can be set up with the combo box above the graph or it can be configured by "cluster.node.sendinfo.history.interval" config property. By default, the values are gathered within a couple of last minutes.

Note that the heap memory is constantly oscillating, even in an idle state, since it is periodically managed by JVM garbage collector (i.e. the temporary data required for running CloverETL Server is periodically removed from/allocated to the heap memory).

Figure 16.2. Performance

Depending on the operating system, the Resource Utilization panel shows the following statistics:

Table 16.1. Resource Utilization

Resource	Operating System		Description
	Unix	Windows
Average load			Shows the number of running/queued tasks per core in the last 1/5/15 minutes.
Time spent waiting for I/O			Shows the percentage of time the server is waiting for input/output data.
Time spent idle			Shows the percentage of time the server is idle (i.e. no jobs are running).
Running jobs			Shows the number of currently running jobs (e.g. graphs, jobflows).
System memory			Shows the total usage of RAM - including operating system and its processes, running programs, etc. (current / maximum (% of max used)).
System disk swap			Shows the usage of the swap memory (current / maximum (% of max used)).
Swap I/O			Amount of memory swapped to/from the disk (amount IN / amount OUT).
Heap memory			Monitors usage of the heap memory (current / maximum (% of max used)). For more information on heap memory, see Table 4.1, “JVM Memory Structure”.
Non-heap memory			Monitors usage of the non-heap memory (current / maximum (% of max used)). For more information on non-heap memory, see Table 4.1, “JVM Memory Structure”.
Event listeners			Shows the number of active event listeners. For more information, see Chapter 24, Listeners.

The CPU Load panel displays a chart with info about total CPU load and CPU load caused by JVM.

Figure 16.3. CPU Load

Running jobs panel lists currently running jobs, 10 oldest runs are displayed.

Figure 16.4. Running jobs

System panel contains info about operating system and license.

Figure 16.5. System

Status history panel displays node statuses history since restart of the server.

Figure 16.6. Status History

User's Access panel lists info about activities on files performed by users. The list displays a timestamp of an event, a username, and a name of the method.

Figure 16.7. Users' Accesses panel

Classloader cache lists all currently cached classloaders. The classloader cache may be empty as classloader caching is disabled by default.

Figure 16.8. Classloader cache

Status panel displays current node status since last server restart. It displays current server status (ready, stopped, ...), exact Java version, exact CloverETL Server version, way of access to database, URLs for synchronous and asynchronous messaging, available heap and non-heap memory, etc.

Figure 16.9. Status

Heartbeat panel displays a list of heartbeat events and their results.

Figure 16.10. Heartbeat

Threads panel lists java threads and their states.

Figure 16.11. Threads

Quartz panel lists scheduled actions: their name, description, start time, end time, time of previous event, time of next event and expected final event.

Figure 16.12. Quartz