Compute plugins

1. Math.pm - <math> - Simple calculations
2. DiffPerSecond.pm - <diffpersec> - Calculate diffs
3. Min.pm - <min> - Calculate minimum value
4. Max.pm - <max> - Calculate maximum value
5. Average.pm - <avg> - Calculate average value

Math.pm (<math> directive)

Add, substract, multiply and divice with this simple plugin.

Examples:

• <math>*2</math> => Multiply by 2
• <math>/2</math> => Divide by 2
• <math>+10</math> => Add 10
• <math>-20</math> => Substract 20

Very useful to transform between bytes/Kbytes/Mbytes etc.

DiffPerSecond.pm (<diffpersec> directive)

DiffPerSecond saves data from previous execution and calculates diffs.

Say you have the following series of information (per second):

10

90

80

The series of results would be:

90-10 = 80

80-90 = -10

The number you provide for <diffpersec> is the number of seconds between samples, so for instance this:

• <diffpersec>1</diffpersec> => Means diff per second (1 second)
• <diffpersec>60</diffpersec> => Actually means diff per minute (60 seconds)

Min.pm (<min> directive)

Calculate minimum value over few iterations

Example:

• <min>10</min> => Calculate minimum value of every 10 iterations

Max.pm (<max> directive)

Calculate maximum value over few iterations

Example:

• <max>10</max> => Calculate maximum value of every 10 iterations

Average.pm (<avg> directive)

Calculate average value over few iterations

Example:

• <avg>10</avg> => Calculate average value over every 10 iterations