Error when importing gurobipy in a supercomputer

Answered

Carlos Olivos

August 29, 2022 21:17

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Hello, 

I am trying to use gurobi in a supercomputer and when I import the gurobipy library I got this error. I could not find something similar. 

See the error below

Traceback (most recent call last):
  File "tsp.py", line 1, in <module>
    import gurobipy as gp
  File "/opt/asn/apps/gurobi_9.5.1/gurobi951/linux64/lib/python3.8_utf32/gurobipy/__init__.py", line 1, in <module>
    from .gurobipy import *
ImportError: /opt/asn/apps/gurobi_9.5.1/gurobi951/linux64/lib/python3.8_utf32/gurobipy/gurobipy.so: undefined symbol: _Py_tracemalloc_config

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  Gwyneth Butera

  • Gurobi Staff

  August 30, 2022 13:11

  Hi Carlos - 

  As far as I know, we've only seen this error once before. This error might be due to a Python version mismatch, or to a de-installation of pytracemalloc.

  • Do you get this error if you run a Python example from the Gurobi example directory?
  • Could you try re-installing gurobipy by going into GUROBI_HOME and running python3 setup.py install?
  • If this does not work, could you try re-installing pytracemalloc?

  Gwyneth

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  Carlos Olivos

  August 30, 2022 14:03

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  Hi Gwyneth, thanks for answering. 

  I ran it with python 3.8, and it worked. Nevertheless, I got this error. 

  Set parameter Username

  Set parameter TokenServer to value "hpcflexlm1"

  Traceback (most recent call last):

    File "tsp.py", line 17, in <module>

      mdl = Model('TSP')

    File "src/gurobipy/model.pxi", line 68, in gurobipy.Model.__init__

    File "src/gurobipy/gurobi.pxi", line 32, in gurobipy.gurobi._getdefaultenv

    File "src/gurobipy/env.pxi", line 62, in gurobipy.Env.__init__

  gurobipy.GurobiError: Failed to connect to token server 'hpcflexlm1' (port 41954) - license file '/opt/asn/apps/gurobi_9.5.1/gurobi.lic'.  Consult the Quick Start Guide for instructions on starting a token server.

   

  I asked the staff of the supercomputer, and they asked me to use python3.7. Nevertheless, when I do that, the error related to _Py_tracemalloc_config pop-up. 

   

  Which option do you think is easier for them to solve? Unfortunately, I do not have access to either install or re-install packages. 

   

  Thanks 

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  Gwyneth Butera

  • Gurobi Staff

  August 30, 2022 17:58

  Hi Carlos -  As this now appears to be a license issue, I have opened a new ticket. I will reply there. G.

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