MemoryPressureSettings
Added in version 2.34.
- class MemoryPressureSettings(**kwargs)
A boxed type representing the settings for the memory pressure handler
MemoryPressureSettings is a boxed type that can be used to provide some custom settings
to control how the memory pressure situations are handled by the different processes.
The memory pressure system implemented inside the different process will try to keep the memory usage under the defined memory limit. In order to do that, it will check the used memory with a user defined frequency and decide whether it should try to release memory. The thresholds passed will define how urgent is to release that memory.
Take into account that badly defined parameters can greatly reduce the performance of the engine. For example, setting memory limit too low with a fast poll interval can cause the process to constantly be trying to release memory.
A MemoryPressureSettings can be passed to a WebContext constructor, and the settings will
be applied to all the web processes created by that context.
A MemoryPressureSettings can be passed to webkit_website_data_manager_set_memory_pressure_settings(),
and the settings will be applied to all the network processes created after that call by any instance of
WebsiteDataManager.
Constructors
- class MemoryPressureSettings
- classmethod new() MemoryPressureSettings
Create a new
MemoryPressureSettingswith the default values.Added in version 2.34.
Methods
- class MemoryPressureSettings
- free() None
Free the
MemoryPressureSettings.Added in version 2.34.
- get_conservative_threshold() float
Gets the conservative memory usage threshold.
Added in version 2.34.
- get_poll_interval() float
Gets the interval at which memory usage is checked.
Added in version 2.34.
- set_conservative_threshold(value: float) None
Sets the memory limit for the conservative policy to start working.
Sets
valueas the fraction of the defined memory limit where the conservative policy starts working. This policy will try to reduce the memory footprint by releasing non critical memory.The threshold must be bigger than 0 and smaller than 1, and it must be smaller than the strict threshold defined in
settings. The default value is 0.33.Added in version 2.34.
- Parameters:
value – fraction of the memory limit where the conservative policy starts working.
- set_kill_threshold(value: float) None
Sets
valueas the fraction of the defined memory limit where the process will be killed.The threshold must be a value bigger or equal to 0. A value of 0 means that the process is never killed. If the threshold is not 0, then it must be bigger than the strict threshold defined in
settings. The threshold can also have values bigger than 1. The default value is 0.Added in version 2.34.
- Parameters:
value – fraction of the memory limit where the process will be killed because of excessive memory usage.
- set_memory_limit(memory_limit: int) None
Sets
memory_limitthe memory limit value tosettings.The default value is the system’s RAM size with a maximum of 3GB.
Added in version 2.34.
- Parameters:
memory_limit – amount of memory (in MB) that the process is allowed to use.
- set_poll_interval(value: float) None
Sets
valueas the poll interval used bysettings.The poll interval value must be bigger than 0. The default value is 30 seconds.
Added in version 2.34.
- Parameters:
value – period (in seconds) between memory usage measurements.
- set_strict_threshold(value: float) None
Sets the memory limit for the strict policy to start working.
Sets
valueas the fraction of the defined memory limit where the strict policy starts working. This policy will try to reduce the memory footprint by releasing critical memory.The threshold must be bigger than 0 and smaller than 1. Also, it must be bigger than the conservative threshold defined in
settings, and smaller than the kill threshold if the latter is not 0. The default value is 0.5.Added in version 2.34.
- Parameters:
value – fraction of the memory limit where the strict policy starts working.