NavigatorConcurrentHardware

The NavigatorConcurrentHardware mixin adds to the Navigator interface features which allow Web content to determine how many logical processors the user has available, in order to let content and Web apps optimize their operations to best take advantage of the user's CPU.

Note: This feature is available in Web Workers.

The number of logical processor cores is a way to measure the number of threads which can effectively be run at once without them having to share CPUs. Modern computers have multiple physical cores in their CPU (two or four cores is typical), but each physical core is also usually able to run more than one thread at a time using advanced scheduling techniques. So a four-core CPU may return 8. The browser may, however, choose to reduce the number in order to represent more accurately the number of Workers that can run at once

Properties

NavigatorConcurrentHardware.hardwareConcurrency Read only
Returns the number of logical processors which may be available to the user agent. This value is always at least 1, and will be 1 if the actual number of logical processors can't be determined.

Methods

The NavigatorConcurrentHardware mixin has no methods.

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'NavigatorConcurrentHardware' in that specification.
Living Standard Initial definition.

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
NavigatorConcurrentHardwareChrome Full support 37Edge Full support ≤18Firefox Full support 48IE ? Opera Full support 24Safari ? WebView Android Full support 37Chrome Android Full support 37Firefox Android Full support 48Opera Android Full support 24Safari iOS ? Samsung Internet Android Full support 3.0
hardwareConcurrencyChrome Full support 37Edge Full support 15Firefox Full support 48IE ? Opera Full support 24Safari ? WebView Android Full support 37Chrome Android Full support 37Firefox Android Full support 48Opera Android Full support 24Safari iOS ? Samsung Internet Android Full support 3.0
Available in workersChrome Full support 37Edge Full support ≤79Firefox ? IE ? Opera Full support 24Safari ? WebView Android Full support 37Chrome Android Full support 37Firefox Android ? Opera Android Full support 24Safari iOS ? Samsung Internet Android Full support 3.0

Legend

Full support
Full support
Compatibility unknown
Compatibility unknown

See also