BrokenPipeError: [Errno 32] Broken pipe

[SDFlying858]

Hello,

I'm attempting to use the optstrategy functionality to optimize my algorithm using an Orange Pi 5 Plus running Ubuntu OS.

My script functions properly when run with only a few variations such as below

strats = cerebro.optstrategy(
            IndicatorResearch,
            period1 = range(1, 3),
            period2 = range(15, 18),
            rsibuy = range (30, 35),
            rsisell = range(60, 65),
    )

It fails when more variations are introduced:

strats = cerebro.optstrategy(
            IndicatorResearch,
            period1 = range(1, 15),
            period2 = range(15, 25  ),
            rsibuy = range (16, 46),
            rsisell = range(56, 76),
    )

When it fails the errors I get for each pool worker are:

Process ForkPoolWorker-2:
Traceback (most recent call last):
  File "/usr/lib/python3.10/multiprocessing/pool.py", line 131, in worker
    put((job, i, result))
  File "/usr/lib/python3.10/multiprocessing/queues.py", line 377, in put
    self._writer.send_bytes(obj)
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 200, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 404, in _send_bytes
    self._send(header)
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.10/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/usr/lib/python3.10/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.10/multiprocessing/pool.py", line 136, in worker
    put((job, i, (False, wrapped)))
  File "/usr/lib/python3.10/multiprocessing/queues.py", line 377, in put
    self._writer.send_bytes(obj)
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 200, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 411, in _send_bytes
    self._send(header + buf)
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe

I'm having trouble understanding what connection is failing, all file reading occurs on the local drive.

Thanks.