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Profiler Domain

Methods

Profiler. enable

Profiler. disable

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.

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. Experimental

Parameters
callCount
boolean Collect accurate call counts beyond simple 'covered' or 'not covered'.

Profiler. stopPreciseCoverage

Disable precise code coverage. Disabling releases unnecessary execution count records and allows executing optimized code. Experimental

Profiler. takePreciseCoverage

Collect coverage data for the current isolate, and resets execution counters. Precise code coverage needs to have started. Experimental

Return object
result
array [ ScriptCoverage ] Coverage data for the current isolate.

Profiler. getBestEffortCoverage

Collect coverage data for the current isolate. The coverage data may be incomplete due to garbage collection. Experimental

Return object
result
array [ ScriptCoverage ] Coverage data for the current isolate.

Events

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().

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().

Types

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

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.

PositionTickInfo

Specifies a number of samples attributed to a certain source position. Experimental

Type: object

Properties
line
integer Source line number (1-based).
ticks
integer Number of samples attributed to the source line.

CoverageRange

Coverage data for a source range. Experimental

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.

FunctionCoverage

Coverage data for a JavaScript function. Experimental

Type: object

Properties
functionName
string JavaScript function name.
ranges
array [ CoverageRange ] Source ranges inside the function with coverage data.

ScriptCoverage

Coverage data for a JavaScript script. Experimental

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.