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: - Calls to the worker SUCCEED after ~1ms npx wrangler dev --remote=true: - Calls to the worker hang for 39 seconds then FAIL with exceeded CPU time limit. 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?

2 Replies

kian•5mo ago

Answered at https://discord.com/channels/595317990191398933/779390076219686943/1196733709584441444

uk•5mo ago

oh thanks

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Worker failing mysteriously with exceeded CPU time limit.