Version: 2021.2
LanguageEnglish
  • C#

ProfilerUnsafeUtility.FlowEvent

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Declaration

public static void FlowEvent(uint flowId, Unity.Profiling.ProfilerFlowEventType flowEventType);

Parameters

flowId Profiler flow identifier.
flowEventType Flow event type.

Description

Add flow event to a Profiler sample.

Use Profiler flow events to highlight the dependencies between task execution on different threads.

Flow event works in conjunction with ProfilerMarker.

using System;
using System.Threading;
using Unity.Profiling;
using Unity.Profiling.LowLevel;
using Unity.Profiling.LowLevel.Unsafe;

public class Example { public const int k_NumberOfTasks = 4;

static readonly ProfilerMarker k_ScheduleParallelTasksMarker = new ProfilerMarker("Schedule Parallel Tasks"); static readonly ProfilerMarker k_ParallelTaskMarker = new ProfilerMarker("Parallel Task"); static readonly ProfilerMarker k_TaskSyncMarker = new ProfilerMarker("Sync Task");

static void EmitFlowEventAndChainThread(uint flowId) { // Mark the next k_ParallelTaskMarker as a beginning of the flow ProfilerUnsafeUtility.FlowEvent(flowId, ProfilerFlowEventType.ParallelNext); using (k_ParallelTaskMarker.Auto()) { // Do work } }

static void ScheduleParallelTask() { uint flowId; var threads = new Thread[k_NumberOfTasks]; using (k_ScheduleParallelTasksMarker.Auto()) { flowId = ProfilerUnsafeUtility.CreateFlow(ProfilerUnsafeUtility.CategoryScripts); // Mark the parent k_ScheduleParallelTasksMarker as a beginning of the flow ProfilerUnsafeUtility.FlowEvent(flowId, ProfilerFlowEventType.Begin); for (var i = 0; i < k_NumberOfTasks; ++i) { var thread = new Thread(() => EmitFlowEventAndChainThread(flowId)); thread.Start(); threads[i] = thread; } }

using (k_TaskSyncMarker.Auto()) { // Mark the parent k_TaskSyncMarker as a beginning of the flow ProfilerUnsafeUtility.FlowEvent(flowId, ProfilerFlowEventType.End); for (var i = 0; i < k_NumberOfTasks; ++i) threads[i].Join(); } } }

You must use FlowEvent together with a ProfilerMarker.

To mark the sample as a beginning or end of a flow, use FlowEvent with ProfilerFlowEventType.Begin and ProfilerFlowEventType.End events within a scope that is instrumented with ProfilerMarker.Begin and ProfilerMarker.End, or within the using scope of ProfilerMarker.Auto.


To mark the sample as a flow continuation point, use FlowEvent with ProfilerFlowEventType.Next and ProfilerFlowEventType.ParallelNext before a call to ProfilerMarker.Begin or ProfilerMarker.Auto.

Note: Unity Job System automatically marks up job scheduling, execution and wait points.

See Also: CreateFlow, CPU Usage Profiler module.