Thank you @ptrblck ! below is the backtrace:
sh-4.2$ gdb --args /home/ec2-user/anaconda3/envs/python3/bin/python3 gpu-test.py
GNU gdb (GDB) Red Hat Enterprise Linux 8.0.1-36.amzn2.0.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /home/ec2-user/anaconda3/envs/python3/bin/python3...done.
(gdb) run
Starting program: /home/ec2-user/anaconda3/envs/python3/bin/python3 gpu-test.py
Missing separate debuginfos, use: debuginfo-install glibc-2.26-62.amzn2.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
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Missing separate debuginfo for /home/ec2-user/anaconda3/envs/python3/lib/python3.10/site-packages/torch/lib/libgomp-a34b3233.so.1
Try: yum --enablerepo='*debug*' install /usr/lib/debug/.build-id/5f/4fb88af97be3ecacc71363136bb015b2a07119.debug
Missing separate debuginfo for /lib64/libcuda.so.1
Try: yum --enablerepo='*debug*' install /usr/lib/debug/.build-id/d7/a1b5fea0f4f1f6375e4ed8a59d4afbd04ef289.debug
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Global seed set to 42
GPU available: True (cuda), used: True
TPU available: False, using: 0 TPU cores
IPU available: False, using: 0 IPUs
HPU available: False, using: 0 HPUs
Number of parameters in network: 29.7k
Detaching after vfork from child process 95196.
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Detaching after vfork from child process 95207.
Global seed set to 42
GPU available: True (cuda), used: True
TPU available: False, using: 0 TPU cores
IPU available: False, using: 0 IPUs
HPU available: False, using: 0 HPUs
Number of parameters in network: 29.7k
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 125, in _main
prepare(preparation_data)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/runpy.py", line 289, in run_path
return _run_module_code(code, init_globals, run_name,
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/runpy.py", line 96, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/home/ec2-user/SageMaker/gpu-test.py", line 139, in <module>
trainer.fit(
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/site-packages/pytorch_lightning/trainer/trainer.py", line 608, in fit
call._call_and_handle_interrupt(
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/site-packages/pytorch_lightning/trainer/call.py", line 36, in _call_and_handle_interrupt
return trainer.strategy.launcher.launch(trainer_fn, *args, trainer=trainer, **kwargs)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/site-packages/pytorch_lightning/strategies/launchers/multiprocessing.py", line 113, in launch
mp.start_processes(
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/site-packages/torch/multiprocessing/spawn.py", line 189, in start_processes
process.start()
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/context.py", line 288, in _Popen
return Popen(process_obj)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 32, in __init__
super().__init__(process_obj)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/popen_fork.py", line 19, in __init__
self._launch(process_obj)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 42, in _launch
prep_data = spawn.get_preparation_data(process_obj._name)
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "/home/ec2-user/anaconda3/envs/python3/lib/python3.10/multiprocessing/spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.