Is my Javascript experiencing a shortage of asyncIds? (Encountered RangeError in inspector_async_hook.js)

Question

Is my Javascript experiencing a shortage of asyncIds? (Encountered RangeError in inspector_async_hook.js)

One issue that I frequently encounter while using async/await is the following error:

RangeError: Value undefined out of range for undefined options property undefined
    at Set.add (<anonymous>)
    at AsyncHook.init (internal/inspector_async_hook.js:19:25)
    at PromiseWrap.emitInitNative (internal/async_hooks.js:134:43)

I am unsure how to resolve this error. My code is written entirely in TypeScript and I have not created any file named 'async_hooks'.

Despite my best efforts to limit the number of simultaneous async functions (using await extensively), it seems that JavaScript fails to reduce the asyncId count efficiently, leading to a rapid exhaustion of the allowed limit.

Even when I tried reducing the use of async/await, the problem persisted. However, delaying the occurrence of the error until after the function completes successfully.

I am using Electron 7 and it appears to have a restricted async pool. This behavior can be replicated with a basic TypeScript code snippet:

class Test {
    private async testCompare(a,b):Promise<boolean> {
        return a == b;
    }

    public async testRun():Promise<void> {
        for (let index = 0; index < 999999999; index++) {
            for (let index2 = 0; index < 999999999; index2++) {
                await this.testCompare(index,index2)
            }
        }
    }

}
new Test().testRun();

This implementation leads to high memory consumption, similar to what I experience in my own program. It appears that the async pool gets filled up quickly until it hits its maximum capacity.

javascript typescript asynchronous promise async-await

Answer 1

Answer №1

Encountered the same issue with Set.add when my set size reached 16777216 (2^24). There seems to be a limit on sets that restricts unique values to this number, although it's not documented explicitly.

You can easily confirm this limit by using a simple for loop.

The following code snippet will trigger the same error:

let s = new Set();
for (let i = 0; i <= 16777216; i++) s.add(i);

However, this revised version will execute without errors:

let s = new Set();
for (let i = 0; i < 16777216; i++) s.add(i);

Note that running this code might consume around 5GB of memory, so adjust your heap limit accordingly to prevent crashes caused by memory constraints.

Answer 2

Encountered the same issue with Set.add when my set size reached 16777216 (2^24). There seems to be a limit on sets that restricts unique values to this number, although it's not documented explicitly.

You can easily confirm this limit by using a simple for loop.

The following code snippet will trigger the same error:

let s = new Set();
for (let i = 0; i <= 16777216; i++) s.add(i);

However, this revised version will execute without errors:

let s = new Set();
for (let i = 0; i < 16777216; i++) s.add(i);

Note that running this code might consume around 5GB of memory, so adjust your heap limit accordingly to prevent crashes caused by memory constraints.

Answer 3

Answer №2

Recently came across an issue while using a Set, and I found a quick workaround

class UniqueSet {
  data = {}

  add (value) {
    this.data[JSON.stringify(value)] = true
  }

  has (value) {
    return this.data[JSON.stringify(value)] == true
  }
}

This solution does not have a limit, it only depends on the available system memory

Answer 4

Recently came across an issue while using a Set, and I found a quick workaround

class UniqueSet {
  data = {}

  add (value) {
    this.data[JSON.stringify(value)] = true
  }

  has (value) {
    return this.data[JSON.stringify(value)] == true
  }
}

This solution does not have a limit, it only depends on the available system memory

Answer 5

Answer №3

RangeError: Value undefined out of range for undefined options property undefined

This particular error occurs when a Set reaches its maximum limit of elements. For more information, you can refer to: Maximum number of entries in Node.js Map?

If you encounter this issue, you might consider using large-set, a package designed to handle a large quantity of elements by partitioning them into smaller sets once the 16,777,216 (2^24) limit is reached. This enables storage and access of more elements than what the built-in Set can manage.

If you prefer not to use an external package, here's a simple workaround solution:

class LargeSet {
    constructor(limit = 16777216) {
        this.limit = limit;
        this.sets = [new Set()];
    }

    has(value) {
        return this.sets.some(set => set.has(value));
    }

    add(value) {
        if (this.sets[this.sets.length - 1].size >= this.limit) {
            this.sets.push(new Set());
        }
        if (this.has(value)) return this;
        this.sets[this.sets.length - 1].add(value);
        return this;
    }

    delete(value) {
        for (const set of this.sets) {
          if (set.delete(value)) return true;
        }
        return false;
    }
    
    clear() {
        this.sets = [new Set()];
    }
}

You can then test the code with the following snippet:

const largeSet = new LargeSet();
for (let i = 0; i <= 16777216; i++) {
    largeSet.add(i); // No errors will occur
}

const set = new Set();
for (let i = 0; i <= 16777216; i++) {
    set.add(i); // Throws a 'RangeError: Value undefined out of range for undefined options property undefined'
}

Answer 6

RangeError: Value undefined out of range for undefined options property undefined

This particular error occurs when a Set reaches its maximum limit of elements. For more information, you can refer to: Maximum number of entries in Node.js Map?

If you encounter this issue, you might consider using large-set, a package designed to handle a large quantity of elements by partitioning them into smaller sets once the 16,777,216 (2^24) limit is reached. This enables storage and access of more elements than what the built-in Set can manage.

If you prefer not to use an external package, here's a simple workaround solution:

class LargeSet {
    constructor(limit = 16777216) {
        this.limit = limit;
        this.sets = [new Set()];
    }

    has(value) {
        return this.sets.some(set => set.has(value));
    }

    add(value) {
        if (this.sets[this.sets.length - 1].size >= this.limit) {
            this.sets.push(new Set());
        }
        if (this.has(value)) return this;
        this.sets[this.sets.length - 1].add(value);
        return this;
    }

    delete(value) {
        for (const set of this.sets) {
          if (set.delete(value)) return true;
        }
        return false;
    }
    
    clear() {
        this.sets = [new Set()];
    }
}

You can then test the code with the following snippet:

const largeSet = new LargeSet();
for (let i = 0; i <= 16777216; i++) {
    largeSet.add(i); // No errors will occur
}

const set = new Set();
for (let i = 0; i <= 16777216; i++) {
    set.add(i); // Throws a 'RangeError: Value undefined out of range for undefined options property undefined'
}

Answer 7

Answer №4

An alternative solution (equally as efficient as using Set) And Exclusive,

const setA = {};
try {
    for (let i = 0; i < 16777216 + 500; i++) setA[i] = null;
} catch (err) {
    console.log('Halted at ', setA.size, ' Because of ');
    console.error(err);
}

console.log('survived even after ', Object.keys(setA).length);

Answer 8

An alternative solution (equally as efficient as using Set) And Exclusive,

const setA = {};
try {
    for (let i = 0; i < 16777216 + 500; i++) setA[i] = null;
} catch (err) {
    console.log('Halted at ', setA.size, ' Because of ');
    console.error(err);
}

console.log('survived even after ', Object.keys(setA).length);

Is my Javascript experiencing a shortage of asyncIds? (Encountered RangeError in inspector_async_hook.js)

Answer №1

Answer №2

Answer №3

Answer №4

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