Profiler Domain
Methods
Events
Types
Methods
Profiler.disable #
Profiler.enable #
Profiler.getBestEffortCoverage #
Collect coverage data for the current isolate. The coverage data may be incomplete due to garbage collection.
Return Object
- result
-
array[ ScriptCoverage ]
Coverage data for the current isolate.
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.startPreciseCoverage #
Enable precise code coverage. Coverage data for JavaScript executed before enabling precise code coverage may be incomplete. Enabling prevents running optimized code and resets execution counters.
parameters
- callCount
-
boolean
Collect accurate call counts beyond simple 'covered' or 'not covered'.
- detailed
-
boolean
Collect block-based coverage.
- allowTriggeredUpdates
-
boolean
Allow the backend to send updates on its own initiative
Return Object
- timestamp
-
number
Monotonically increasing time (in seconds) when the coverage update was taken in the backend.
Profiler.stopPreciseCoverage #
Disable precise code coverage. Disabling releases unnecessary execution count records and allows executing optimized code.
Profiler.takePreciseCoverage #
Collect coverage data for the current isolate, and resets execution counters. Precise code coverage needs to have started.
Return Object
- result
-
array[ ScriptCoverage ]
Coverage data for the current isolate.
- timestamp
-
number
Monotonically increasing time (in seconds) when the coverage update was taken in the backend.
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 recording 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.CoverageRange #
Coverage data for a source range.
Type: object
properties
- startOffset
-
integer
JavaScript script source offset for the range start.
- endOffset
-
integer
JavaScript script source offset for the range end.
- count
-
integer
Collected execution count of the source range.
Profiler.FunctionCoverage #
Coverage data for a JavaScript function.
Type: object
properties
- functionName
-
string
JavaScript function name.
- ranges
-
array[ CoverageRange ]
Source ranges inside the function with coverage data.
- isBlockCoverage
-
boolean
Whether coverage data for this function has block granularity.
Profiler.PositionTickInfo #
Specifies a number of samples attributed to a certain source position.
Type: object
properties
- line
-
integer
Source line number (1-based).
- ticks
-
integer
Number of samples attributed to the source line.
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.
- 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.
Profiler.ScriptCoverage #
Coverage data for a JavaScript script.
Type: object
properties
- scriptId
-
Runtime.ScriptId
JavaScript script id.
- url
-
string
JavaScript script name or url.
- functions
-
array[ FunctionCoverage ]
Functions contained in the script that has coverage data.