Python IOError: [Errno 5] Input/output error?

Question

I m running on a remote server a python script using nohup.

• First I connected to the remote machine using a VPN and SSH

• Second I run a python script using the following command:

  nohup python backmap.py mpirun -np 48 &

The python script contains the following lines:

frame = []
file_in = open("Traj_equil_prot.pdb", "r")
for line in file_in:
    if line.startswith('TITLE'):
        frame.append(line[127:134])

import os
for fileNum in range(631, 29969):
    os.system("./initram-v5.sh -f Traj_equil_prot_frame" +  str(fileNum) + ".pdb -o Traj_equilprot_aa_frame" + str(frame[fileNum]) + ".gro -to amber -p topol.top")

The script was running just fine the whole day. but now it just crashed and when I try to re-launch it again I'm getting the following error:

Traceback (most recent call last): File "", line 1, in IOError: [Errno 5] Input/output error

The file is in the working directory. I tried to disconnect/connect again but still the same problem. I don't know what I'm missing. Any help, please?

Answer 1

I had the same problem, I used to run my script using this command:

python MY_SCRIPT.py &

The script will run in the background and the output will be displayed on the terminal until you logout or exit.

By logging out, the script is still running but it's output has nowhere to display thus, exceptions will be made when the script wants to display something (e.g. calling print).

---

Solution:

I've piped the output to somewhere other than the actual terminal display:

python MY_SCRIPT.py >/dev/null &

Checkout this link for more details:

https://stackoverflow.com/a/38238281/6826476