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Remove scheduler sampling profiler shared array buffer
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No one has been using this data so there's no reason to collect it. Event log has been maintained and tests have been updated.
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Brian Vaughn committed Feb 18, 2021
1 parent af3d526 commit 8452fcb
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Showing 3 changed files with 15 additions and 121 deletions.
2 changes: 1 addition & 1 deletion packages/scheduler/src/SchedulerFeatureFlags.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@

export const enableSchedulerDebugging = false;
export const enableIsInputPending = false;
export const enableProfiling = false;
export const enableProfiling = __VARIANT__;

// TODO: enable to fix https://github.com/facebook/react/issues/20756.
export const enableSetImmediate = __VARIANT__;
56 changes: 0 additions & 56 deletions packages/scheduler/src/SchedulerProfiling.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,45 +10,9 @@
import type {PriorityLevel} from './SchedulerPriorities';
import {enableProfiling} from './SchedulerFeatureFlags';

import {NoPriority} from './SchedulerPriorities';

let runIdCounter: number = 0;
let mainThreadIdCounter: number = 0;

const isEnabledSharedArrayBuffer =
// $FlowFixMe Flow doesn't know about SharedArrayBuffer
typeof SharedArrayBuffer === 'function' &&
// We only use SharedArrayBuffer when cross origin isolation is enabled.
typeof window !== 'undefined' &&
window.crossOriginIsolated === true;

const profilingStateSize = 4;
export const sharedProfilingBuffer = enableProfiling
? isEnabledSharedArrayBuffer
? new SharedArrayBuffer(profilingStateSize * Int32Array.BYTES_PER_ELEMENT)
: typeof ArrayBuffer === 'function'
? new ArrayBuffer(profilingStateSize * Int32Array.BYTES_PER_ELEMENT)
: null // Don't crash the init path on IE9
: null;

const profilingState =
enableProfiling && sharedProfilingBuffer !== null
? new Int32Array(sharedProfilingBuffer)
: []; // We can't read this but it helps save bytes for null checks

const PRIORITY = 0;
const CURRENT_TASK_ID = 1;
const CURRENT_RUN_ID = 2;
const QUEUE_SIZE = 3;

if (enableProfiling) {
profilingState[PRIORITY] = NoPriority;
// This is maintained with a counter, because the size of the priority queue
// array might include canceled tasks.
profilingState[QUEUE_SIZE] = 0;
profilingState[CURRENT_TASK_ID] = 0;
}

// Bytes per element is 4
const INITIAL_EVENT_LOG_SIZE = 131072;
const MAX_EVENT_LOG_SIZE = 524288; // Equivalent to 2 megabytes
Expand Down Expand Up @@ -116,8 +80,6 @@ export function markTaskStart(
ms: number,
) {
if (enableProfiling) {
profilingState[QUEUE_SIZE]++;

if (eventLog !== null) {
// performance.now returns a float, representing milliseconds. When the
// event is logged, it's coerced to an int. Convert to microseconds to
Expand All @@ -136,10 +98,6 @@ export function markTaskCompleted(
ms: number,
) {
if (enableProfiling) {
profilingState[PRIORITY] = NoPriority;
profilingState[CURRENT_TASK_ID] = 0;
profilingState[QUEUE_SIZE]--;

if (eventLog !== null) {
logEvent([TaskCompleteEvent, ms * 1000, task.id]);
}
Expand All @@ -155,8 +113,6 @@ export function markTaskCanceled(
ms: number,
) {
if (enableProfiling) {
profilingState[QUEUE_SIZE]--;

if (eventLog !== null) {
logEvent([TaskCancelEvent, ms * 1000, task.id]);
}
Expand All @@ -172,10 +128,6 @@ export function markTaskErrored(
ms: number,
) {
if (enableProfiling) {
profilingState[PRIORITY] = NoPriority;
profilingState[CURRENT_TASK_ID] = 0;
profilingState[QUEUE_SIZE]--;

if (eventLog !== null) {
logEvent([TaskErrorEvent, ms * 1000, task.id]);
}
Expand All @@ -193,10 +145,6 @@ export function markTaskRun(
if (enableProfiling) {
runIdCounter++;

profilingState[PRIORITY] = task.priorityLevel;
profilingState[CURRENT_TASK_ID] = task.id;
profilingState[CURRENT_RUN_ID] = runIdCounter;

if (eventLog !== null) {
logEvent([TaskRunEvent, ms * 1000, task.id, runIdCounter]);
}
Expand All @@ -205,10 +153,6 @@ export function markTaskRun(

export function markTaskYield(task: {id: number, ...}, ms: number) {
if (enableProfiling) {
profilingState[PRIORITY] = NoPriority;
profilingState[CURRENT_TASK_ID] = 0;
profilingState[CURRENT_RUN_ID] = 0;

if (eventLog !== null) {
logEvent([TaskYieldEvent, ms * 1000, task.id, runIdCounter]);
}
Expand Down
78 changes: 14 additions & 64 deletions packages/scheduler/src/__tests__/SchedulerProfiling-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,6 @@
'use strict';

let Scheduler;
let sharedProfilingArray;
// let runWithPriority;
let ImmediatePriority;
let UserBlockingPriority;
Expand Down Expand Up @@ -59,10 +58,6 @@ describe('Scheduler', () => {
jest.mock('scheduler', () => require('scheduler/unstable_mock'));
Scheduler = require('scheduler');

sharedProfilingArray = new Int32Array(
Scheduler.unstable_Profiling.sharedProfilingBuffer,
);

// runWithPriority = Scheduler.unstable_runWithPriority;
ImmediatePriority = Scheduler.unstable_ImmediatePriority;
UserBlockingPriority = Scheduler.unstable_UserBlockingPriority;
Expand All @@ -76,20 +71,6 @@ describe('Scheduler', () => {
// shouldYield = Scheduler.unstable_shouldYield;
});

const PRIORITY = 0;
const CURRENT_TASK_ID = 1;
const CURRENT_RUN_ID = 2;
const QUEUE_SIZE = 3;

afterEach(() => {
if (sharedProfilingArray[QUEUE_SIZE] !== 0) {
throw Error(
'Test exited, but the shared profiling buffer indicates that a task ' +
'is still running',
);
}
});

const TaskStartEvent = 1;
const TaskCompleteEvent = 2;
const TaskErrorEvent = 3;
Expand Down Expand Up @@ -272,23 +253,6 @@ describe('Scheduler', () => {
return '\n' + result;
}

function getProfilingInfo() {
const queueSize = sharedProfilingArray[QUEUE_SIZE];
if (queueSize === 0) {
return 'Empty Queue';
}
const priorityLevel = sharedProfilingArray[PRIORITY];
if (priorityLevel === 0) {
return 'Suspended, Queue Size: ' + queueSize;
}
return (
`Task: ${sharedProfilingArray[CURRENT_TASK_ID]}, ` +
`Run: ${sharedProfilingArray[CURRENT_RUN_ID]}, ` +
`Priority: ${priorityLevelToString(priorityLevel)}, ` +
`Queue Size: ${sharedProfilingArray[QUEUE_SIZE]}`
);
}

it('creates a basic flamegraph', () => {
Scheduler.unstable_Profiling.startLoggingProfilingEvents();

Expand All @@ -297,35 +261,27 @@ describe('Scheduler', () => {
NormalPriority,
() => {
Scheduler.unstable_advanceTime(300);
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 1');
scheduleCallback(
UserBlockingPriority,
() => {
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 2');
Scheduler.unstable_advanceTime(300);
},
{label: 'Bar'},
);
Scheduler.unstable_advanceTime(100);
Scheduler.unstable_yieldValue('Yield');
Scheduler.unstable_yieldValue('Yield 3');
return () => {
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 4');
Scheduler.unstable_advanceTime(300);
};
},
{label: 'Foo'},
);
expect(Scheduler).toFlushAndYieldThrough([
'Task: 1, Run: 1, Priority: Normal, Queue Size: 1',
'Yield',
]);
expect(Scheduler).toFlushAndYieldThrough(['Yield 1', 'Yield 3']);
Scheduler.unstable_advanceTime(100);
expect(Scheduler).toFlushAndYield([
'Task: 2, Run: 2, Priority: User-blocking, Queue Size: 2',
'Task: 1, Run: 3, Priority: Normal, Queue Size: 1',
]);

expect(getProfilingInfo()).toEqual('Empty Queue');
expect(Scheduler).toFlushAndYield(['Yield 2', 'Yield 4']);

expect(stopProfilingAndPrintFlamegraph()).toEqual(
`
Expand All @@ -340,19 +296,16 @@ Task 1 [Normal] │ ████████░░░░░░░
Scheduler.unstable_Profiling.startLoggingProfilingEvents();

const task = scheduleCallback(NormalPriority, () => {
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 1');
Scheduler.unstable_advanceTime(300);
Scheduler.unstable_yieldValue('Yield');
Scheduler.unstable_yieldValue('Yield 2');
return () => {
Scheduler.unstable_yieldValue('Continuation');
Scheduler.unstable_advanceTime(200);
};
});

expect(Scheduler).toFlushAndYieldThrough([
'Task: 1, Run: 1, Priority: Normal, Queue Size: 1',
'Yield',
]);
expect(Scheduler).toFlushAndYieldThrough(['Yield 1', 'Yield 2']);
Scheduler.unstable_advanceTime(100);

cancelCallback(task);
Expand Down Expand Up @@ -392,28 +345,25 @@ Task 1 [Normal] │██████🡐 errored
Scheduler.unstable_Profiling.startLoggingProfilingEvents();

const task1 = scheduleCallback(NormalPriority, () => {
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 1');
Scheduler.unstable_advanceTime(300);
Scheduler.unstable_yieldValue('Yield');
Scheduler.unstable_yieldValue('Yield 2');
return () => {
Scheduler.unstable_yieldValue('Continuation');
Scheduler.unstable_advanceTime(200);
};
});
const task2 = scheduleCallback(NormalPriority, () => {
Scheduler.unstable_yieldValue(getProfilingInfo());
Scheduler.unstable_yieldValue('Yield 3');
Scheduler.unstable_advanceTime(300);
Scheduler.unstable_yieldValue('Yield');
Scheduler.unstable_yieldValue('Yield 4');
return () => {
Scheduler.unstable_yieldValue('Continuation');
Scheduler.unstable_advanceTime(200);
};
});

expect(Scheduler).toFlushAndYieldThrough([
'Task: 1, Run: 1, Priority: Normal, Queue Size: 2',
'Yield',
]);
expect(Scheduler).toFlushAndYieldThrough(['Yield 1', 'Yield 2']);
Scheduler.unstable_advanceTime(100);

cancelCallback(task1);
Expand Down

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