This topic describes the syntax, description, parameters, and return values of throttling functions. This topic also provides examples of these functions.

limit_rate_after

The following table describes the details about this function.
Item Description
Syntax limit_rate_after(n, unit)
Description Sets the upper limit of the data transfer rate. If the upper limit is reached, the data transfer rate is throttled.
Parameter
  • n: the lowest data transfer rate. Data type: integer. If you do not set the unit parameter, the unit is byte/s.
  • unit: the unit to measure the data transfer rate. Data type: character. This parameter is optional. Valid values of unit: K, M, and G. These values are not case-sensitive.
Return value If the function succeeds, true is returned. Otherwise, false is returned.
Example 
limit_rate_after(10, 'k')                                                                                                                                                              
limit_rate(1, 'm') 
//Note: If the data transfer rate is lower than 10 Kbit/s, it is not throttled. If the data transfer rate is higher than 10 Kbit/s, it is throttled to 1 Mbit/s.

limit_rate

The following table describes the details about this function.
Item Description
Syntax limit_rate(n, unit)
Description Sets the upper limit of the data transfer rate. By default, the lowest data transfer rate is 4 Kbit/s. If you specify a data transfer rate that is lower than 4 Kbit/s, the data transfer rate is throttled to 4 Kbit/s.
Parameter
  • n: the lowest data transfer rate. Data type: integer. If you do not set the unit parameter, the unit is byte/s.
  • unit: the unit to measure the data transfer rate. Data type: char. This parameter is optional. Valid values of unit: K, M, and G. These values are not case-sensitive.
Return value If the function succeeds, true is returned. Otherwise, false is returned.
Example 
limit_rate_after(10, 'k')                                                                                                                                                              
limit_rate(1, 'm') 
//Note: If the data transfer rate is lower than 10 Kbit/s, it is not throttled. If the data transfer rate is higher than 10 Kbit/s, it is throttled to 1 Mbit/s.