TraceProcessor

Kotlin API for Perfetto Trace Processor, which enables SQL querying against the data stored in a Perfetto trace.

This includes synchronous and async trace sections, kernel-level scheduling timing, binder events... If it's displayed in Android Studio system trace or ui.perfetto.dev, it can be queried from this API.

// Collect the duration of all slices named "activityStart" in the trace
val activityStartDurationNs = TraceProcessor.runServer {
    loadTrace(trace) {
        query("SELECT dur FROM slice WHERE name LIKE \"activityStart\"").toList {
            it.long("dur")
        }
    }
}

Note that traces generally hold events from multiple apps, services and processes, so it's recommended to filter potentially common trace events to the process you're interested in. See the following example which queries Choreographer#doFrame slices (labelled spans of time) only for a given package name:

query("""
    |SELECT
    |    slice.name,slice.ts,slice.dur
    |FROM slice
    |    INNER JOIN thread_track on slice.track_id = thread_track.id
    |    INNER JOIN thread USING(utid)
    |    INNER JOIN process USING(upid)
    |WHERE
    |    slice.name LIKE "Choreographer#doFrame%" AND
    |    process.name LIKE "$packageName"
    """.trimMargin()
)

See also Perfetto project documentation:

• Trace Processor overview

• Common queries

Summary

@ExperimentalTraceProcessorApi
@<Error class: unknown class>
fun <T : Any?> runServer(
    serverLifecycleManager: ServerLifecycleManager,
    eventCallback: TraceProcessor.EventCallback,
    tracer: TraceProcessor.Tracer,
    timeout: Duration = SERVER_START_TIMEOUT_MS,
    block: TraceProcessor.() -> T
): T

@ExperimentalTraceProcessorApi
TraceProcessor(
    serverLifecycleManager: ServerLifecycleManager,
    tracer: TraceProcessor.Tracer = Tracer(),
    eventCallback: TraceProcessor.EventCallback = EventCallback.Noop
)

fun <T : Any?> loadTrace(trace: PerfettoTrace, block: TraceProcessor.Session.() -> T): T