Apache JMeter

org.apache.jmeter.monitor.util
Class Stats

java.lang.Object
  extended by org.apache.jmeter.monitor.util.Stats

public class Stats
extends Object

Description:

Stats is responsible for calculating the load and health of a given server. It uses tomcat's status servlet results. A schema was generated for the XML output and JAXB was used to generate classes.

The equations are:

memory weight = (int)(50 * (free/max))
thread weight = (int)(50 * (current/max))

The load factors are stored in the properties files. Simply change the values in the properties to change how load is calculated. The defaults values are memory (50) and threads (50). The sum of the factors must equal 100.


Field Summary
static int ACTIVE
           
static double ACTIVE_PER
           
static int DEAD
           
static int DEFAULT_MEMORY_FACTOR
           
static int DEFAULT_THREAD_FACTOR
           
static int HEALTHY
           
static double HEALTHY_PER
           
static int WARNING
           
static double WARNING_PER
           
 
Constructor Summary
Stats()
           
 
Method Summary
static int calculateLoad(Status stat)
          The method is responsible for taking a status object and calculating an int value from 1 to 100.
static int calculateMemoryLoad(Status stat)
          Method will calculate the memory load: used / max = load.
static int calculateStatus(Status stat)
          Method should calculate if the server is: dead, active, warning or healthy.
static int calculateThreadLoad(Status stat)
          Method will calculate the thread load: busy / max = load.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEAD

public static final int DEAD
See Also:
Constant Field Values

ACTIVE

public static final int ACTIVE
See Also:
Constant Field Values

WARNING

public static final int WARNING
See Also:
Constant Field Values

HEALTHY

public static final int HEALTHY
See Also:
Constant Field Values

DEFAULT_MEMORY_FACTOR

public static final int DEFAULT_MEMORY_FACTOR
See Also:
Constant Field Values

DEFAULT_THREAD_FACTOR

public static final int DEFAULT_THREAD_FACTOR
See Also:
Constant Field Values

HEALTHY_PER

public static final double HEALTHY_PER
See Also:
Constant Field Values

ACTIVE_PER

public static final double ACTIVE_PER
See Also:
Constant Field Values

WARNING_PER

public static final double WARNING_PER
See Also:
Constant Field Values
Constructor Detail

Stats

public Stats()
Method Detail

calculateLoad

public static int calculateLoad(Status stat)
The method is responsible for taking a status object and calculating an int value from 1 to 100. We use a combination of free memory and free threads. The current factor is 50/50.

Parameters:
stat -
Returns:
calculated load value

calculateStatus

public static int calculateStatus(Status stat)
Method should calculate if the server is: dead, active, warning or healthy. We do this by looking at the current busy threads.
  1. free > spare is healthy
  2. free < spare is active
  3. busy threads > 75% is warning
  4. none of the above is dead

Parameters:
stat -
Returns:
integer representing the status

calculateMemoryLoad

public static int calculateMemoryLoad(Status stat)
Method will calculate the memory load: used / max = load. The load value is an integer between 1 and 100. It is the percent memory used. Changed this to be more like other system monitors. Peter Lin 2-11-05

Parameters:
stat -
Returns:
memory load

calculateThreadLoad

public static int calculateThreadLoad(Status stat)
Method will calculate the thread load: busy / max = load. The value is an integer between 1 and 100. It is the percent busy.

Parameters:
stat -
Returns:
thread load

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