PressureRecord: state property

Limited availabilityAvailable in workersSecure context

The read-only state property is a string indicating the pressure state recorded.

Value

A string indicating the pressure state recorded. The Compute Pressure API uses human-readable pressure states with the following semantics (see also the specification):

• ⚪ "nominal": The conditions of the target device are at an acceptable level with no noticeable adverse effects on the user.
• 🟢 "fair": Target device pressure, temperature and/or energy usage are slightly elevated, potentially resulting in reduced battery-life, as well as fans (or systems with fans) becoming active and audible. Apart from that the target device is running flawlessly and can take on additional work.
• 🟡 "serious": Target device pressure, temperature and/or energy usage is consistently highly elevated. The system may be throttling as a countermeasure to reduce thermals.
• 🔴 "critical": The temperature of the target device or system is significantly elevated and it requires cooling down to avoid any potential issues.

Examples

Using the state property

In the following example we log the value of the state property in the pressure observer callback.

function callback(records) {
  const lastRecord = records[records.length - 1];
  console.log(`Current pressure is ${lastRecord.state}`);
}

try {
  const observer = new PressureObserver(callback);
  await observer.observe("cpu", {
    sampleInterval: 1000, // 1000ms
  });
} catch (error) {
  // report error setting up the observer
}

Specifications

Browser compatibility