Chrome DevTools Protocol

Methods

Profiler.disable #

Profiler.enable #

Profiler.setSamplingInterval #

Changes CPU profiler sampling interval. Must be called before CPU profiles recording started.

parameters

interval: integer

New sampling interval in microseconds.

Profiler.start #

Profiler.stop #

Return Object

profile: Profile

Recorded profile.

Events

Profiler.consoleProfileFinished #

parameters

id: string
location: Debugger.Location

Location of console.profileEnd().
profile: Profile
title: string

Profile title passed as an argument to console.profile().

Profiler.consoleProfileStarted #

Sent when new profile recodring is started using console.profile() call.

parameters

id: string
location: Debugger.Location

Location of console.profile().
title: string

Profile title passed as an argument to console.profile().

Types

Profiler.Profile #

Profile.

Type: object

properties

nodes: array[ ProfileNode ]

The list of profile nodes. First item is the root node.
startTime: number

Profiling start timestamp in microseconds.
endTime: number

Profiling end timestamp in microseconds.
samples: array[ integer ]

Ids of samples top nodes.
timeDeltas: array[ integer ]

Time intervals between adjacent samples in microseconds. The first delta is relative to the profile startTime.

Profiler.ProfileNode #

Profile node. Holds callsite information, execution statistics and child nodes.

Type: object

properties

id: integer

Unique id of the node.
callFrame: Runtime.CallFrame

Function location.
hitCount: integer

Number of samples where this node was on top of the call stack.

Experimental
children: array[ integer ]

Child node ids.
deoptReason: string

The reason of being not optimized. The function may be deoptimized or marked as don't optimize.
positionTicks: array[ PositionTickInfo ]

An array of source position ticks.

Experimental