Errors with Python workers when trying to perform heavy compute

[samuelcolvin]

I'm trying to run the following on Python CF workers as part of the current closed beta:

import numpy as np
import time


def main():
    size = 1000
    A = np.random.rand(size, size)
    B = np.random.rand(size, size)

    result = np.dot(A, B)
    return result

I'm seeing the following two errors when running npx wrangler tail:

POST https://xxx - Exception Thrown @ 02/02/2025, 18:20:12
  (warn) Error in makeHandler
  (warn) TypeError: Cannot read properties of undefined (reading 'callRelaxed')
  (warn)     at pyodide:python-entrypoint-helper:98:50
  (warn)     at enterJaegerSpan (pyodide-internal:jaeger:8:16)
  (warn)     at Object.fetch (pyodide:python-entrypoint-helper:97:34)
✘ [ERROR]   TypeError: Cannot read properties of undefined (reading 'callRelaxed')

and

POST https://xxx - Exception Thrown @ 02/02/2025, 18:25:41
  (error) Aborted()
  (error) Pyodide has suffered a fatal error. Please report this to the Pyodide maintainers.
  (error) The cause of the fatal error was:
  (error) RuntimeError: Aborted(). Build with -sASSERTIONS for more info.
✘ [ERROR]   Error: Aborted(). Build with -sASSERTIONS for more info.

[mikenomitch]

Hey @samuelcolvin, we'll take a look at this in the next few days and let you know.

[hoodmane]

I think the error TypeError: Cannot read properties of undefined (reading 'callRelaxed') is because you didn't define an on_fetch handler.