TraceMetric
@ExperimentalMetricApi
abstract class TraceMetric : Metric
MemoryCountersMetric |
Captures the number of page faults over time for a target package name. |
MemoryUsageMetric |
Metric for tracking the memory usage of the target application. |
Metric which captures results from a Perfetto trace with custom PerfettoTraceProcessor queries.
This is a more customizable version of TraceSectionMetric which can perform arbitrary queries against the captured PerfettoTrace.
Sample metric which finds the duration of the first "activityResume" trace section for the traced package:
class ActivityResumeMetric : TraceMetric() {
override fun getMeasurements(
captureInfo: CaptureInfo,
traceSession: PerfettoTraceProcessor.Session
): List<Measurement> {
val rowSequence = traceSession.query(
"""
SELECT
slice.name as name,
slice.ts as ts,
slice.dur as 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
process.name LIKE ${captureInfo.targetPackageName}
AND slice.name LIKE "activityResume"
""".trimIndent()
)
// this metric queries a single slice type to produce submetrics, but could be extended
// to capture timing of every component of activity lifecycle
val activityResultNs = rowSequence.firstOrNull()?.double("dur")
return if (activityResultMs != null) {
listOf(Measurement("activityResumeMs", activityResultNs / 1_000_000.0))
} else {
emptyList()
}
}
}
Summary
Public constructors |
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Public functions |
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abstract List<Metric.Measurement> |
getMeasurements(Get the metric result for a given iteration given information about the target process and a TraceProcessor session |
Public constructors
Public functions
getMeasurements
Added in 1.3.0
abstract fun getMeasurements(
captureInfo: Metric.CaptureInfo,
traceSession: PerfettoTraceProcessor.Session
): List<Metric.Measurement>
Get the metric result for a given iteration given information about the target process and a TraceProcessor session