使用

qmlprofiler /usr/bin/testapp

or

/usr/bin/testapp -qmljsdebugger=port:12345

# another terminal

qmlprofiler -a localhsot -p 12345

参考（来源）：

-qmljsdebugger=port:<port>[,host:<ip address>][,block]

Where port (mandatory) specifies the debugging port, ip address (optional) specifies the IP address of the host where the application is running, and block (optional) prevents the application from running until the debug client connects to the server. This enables debugging from the start.

diagram

@startuml
class QJSEnginePrivate {
    addToDebugServer(QJSEngine *q)
}

QJSEnginePrivate <|-- QQmlEnginePrivate
QQmlEnginePrivate::profiler *-> QQmlProfiler
class QQmlEnginePrivate {
    profiler : QQmlProfiler
}

class QJSEngine {
    evaluate(program, fileName, lineNumber)
    newObject()
    newArray(length)
    newQObject(QObject *o)
    newQMetaObject()
}

QJSEngine <|-- QQmlEngine
class QQmlEngine {
    rootContext();
    setImageProvider();
    setUrlInterpreter()
    createContextForObject()
    setObjectOwnersip()
}

QQmlProfilerDefinitions <|-- QQmlAbstractProfilerAdaptor
QQmlProfilerDefinitions <|-- QQmlProfiler
QQmlProfilerDefinitions <|-- QQmlProfilerHelper
QQmlProfilerHelper <|-- QQmlBindingProfiler
QQmlProfilerHelper <|-- QQmlHandlingSignalProfiler
QQmlProfilerHelper <|-- QQmlCompilingProfiler
QQmlProfilerHelper <|-- QQmlVmeProfiler
QQmlProfilerHelper <|-- QQmlObjectCreationProfiler
QQmlProfilerHelper <|-- QQmlObjectCompletionProfiler

QQmlBindingProfiler::profiler *-> QQmlProfiler
QQmlHandlingSignalProfiler::profiler *-> QQmlProfiler
QQmlCompilingProfiler::profiler *-> QQmlProfiler
QQmlVmeProfiler::profiler *-> QQmlProfiler
QQmlObjectCreationProfiler::profiler *-> QQmlProfiler
QQmlObjectCompletionProfiler::profiler *-> QQmlProfiler

class QQmlAbstractProfilerAdaptor {
    startProfiling(features)
    stopProfiling()
    reportData(bool trackLocations)
    startService(QQmlProfilerService service)
    sendMessages()
}

class QQmlProfiler {
    startBinding(binding, function)
    startCompiling()
    startHandlingSignal()
    startCreating()
    m_data
}

class QQmlMemoryProfiler
@enduml