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Re: [Bug-glpk] [Fwd: Windows appdata write error - Permission denied]

From: Heinrich Schuchardt
Subject: Re: [Bug-glpk] [Fwd: Windows appdata write error - Permission denied]
Date: Mon, 25 Jul 2016 00:28:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0

Hello João,

this seems to be a problem that is not related to GLPK but to the
generation of temporary file names in your Python code.

Could it be that you try to create a file that is already in use?

You could append os.getpid() to the file name to make sure that two
processes do not use the same temporary file.

Best regards

Heinrich Schuchardt

On 07/23/2016 01:37 PM, Andrew Makhorin wrote:
> -------- Forwarded Message --------
> Subject: Windows appdata write error - Permission denied
> Date: Sat, 23 Jul 2016 10:21:17 +0200
> Hi,
> I am running an optimization problem in python using pyomo 4.3.11388 and
> the GLPK solver 4.57 on Windows 7. While running 8 calls in parallel
> with multiprocessing.Pool GLPK has a rare write problem to the \Users
> \user\AppData\Local\Temp folder: This happens only once out of more than
> thousands of successful runs. Anyone can help? Thanks!
> ERROR: "[base]\site-packages\pyomo\opt\base\solvers.py", 575, solve
> Solver log: GLPSOL: GLPK LP/MIP Solver, v4.57 Parameter(s) specified in
> the command line: --write C:\Users\JGOREN~1\AppData\Local\Temp
> \tmp4fo_8eqx.glpk.raw --wglp C:\Users\JGOREN~1\AppData\Local\Temp
> \tmps7viej_q.glpk.glp --cpxlp C:\Users\JGOREN~1\AppData\Local\Temp
> \tmpjnqvqljx.pyomo.lp Reading problem data from 'C:\Users\JGOREN~1
> \AppData\Local\Temp\tmpjnqvqljx.pyomo.lp'... 25 rows, 45 columns, 69
> non-zeros 223 lines were read Writing problem data to 'C:\Users\JGOREN~1
> \AppData\Local\Temp\tmps7viej_q.glpk.glp'... Unable to create 'C:\Users
> \JGOREN~1\AppData\Local\Temp\tmps7viej_q.glpk.glp' - Permission denied
> Unable to write problem in GLPK format
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