2 replies

Worker failing mysteriously with exceeded CPU time limit.

I'm trying to run this minimal worker:

// Worker
export default {
    async fetch(request: Request) {
        let stopTime = Date.now() + 1; //1ms
        let curTime = Date.now()
        while(curTime < stopTime) {
            curTime =  Date.now()
        }
        return new Response();
    }
};

// Worker
export default {
    async fetch(request: Request) {
        let stopTime = Date.now() + 1; //1ms
        let curTime = Date.now()
        while(curTime < stopTime) {
            curTime =  Date.now()
        }
        return new Response();
    }
};

When this worker is deployed with:

npx wrangler dev --remote=false

npx wrangler dev --remote=false

:
- Calls to the worker SUCCEED after ~1ms

npx wrangler dev --remote=true

npx wrangler dev --remote=true

:
- Calls to the worker hang for 39 seconds then FAIL with exceeded CPU time limit.

npx wrangler deploy

npx wrangler deploy

:
- Calls to the worker hang for 39 seconds then FAIL with exceeded CPU time limit.

------

Is this intended behavior? What's the reason for this occurring?

Cloudflare Developers•3y ago•

2 replies

usmannk

Worker failing mysteriously with exceeded CPU time limit.

I'm trying to run this minimal worker:

// Worker
export default {
    async fetch(request: Request) {
        let stopTime = Date.now() + 1; //1ms
        let curTime = Date.now()
        while(curTime < stopTime) {
            curTime =  Date.now()
        }
        return new Response();
    }
};

// Worker
export default {
    async fetch(request: Request) {
        let stopTime = Date.now() + 1; //1ms
        let curTime = Date.now()
        while(curTime < stopTime) {
            curTime =  Date.now()
        }
        return new Response();
    }
};

When this worker is deployed with:

npx wrangler dev --remote=false

npx wrangler dev --remote=false

:
- Calls to the worker SUCCEED after ~1ms

npx wrangler dev --remote=true

npx wrangler dev --remote=true

:
- Calls to the worker hang for 39 seconds then FAIL with exceeded CPU time limit.

npx wrangler deploy

npx wrangler deploy

:
- Calls to the worker hang for 39 seconds then FAIL with exceeded CPU time limit.

------

Is this intended behavior? What's the reason for this occurring?

Worker failing mysteriously with exceeded CPU time limit.

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