Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Heinrich Schuchardt
On 08/30/2017 08:13 PM, Simone Atzeni wrote: > Heinrich, > > looking at the thread example I added the glp_config("TLS”) check and I was > getting a undefined reference which made me realized that for some reason I > was linking to a wrong and old GLPK library instead of the one manually > comp

Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Simone Atzeni
Heinrich, looking at the thread example I added the glp_config("TLS”) check and I was getting a undefined reference which made me realized that for some reason I was linking to a wrong and old GLPK library instead of the one manually compiled by me. So it’s all good now. Thanks for your help!

Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Heinrich Schuchardt
On 08/30/2017 07:23 PM, Simone Atzeni wrote: > Hi Heinrich, > > you mean the line: > > std::string filename = "ilp_problem" + std::to_string(rand()) + ".lp”; > > or the problem name: > > glp_set_prob_name(mip, "overlap”); > > The filename is not used at all in the function, it was just somethi

Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Simone Atzeni
Hi Heinrich, you mean the line: std::string filename = "ilp_problem" + std::to_string(rand()) + ".lp”; or the problem name: glp_set_prob_name(mip, "overlap”); The filename is not used at all in the function, it was just something I forgot to remove. Thanks, Simone > On Aug 30, 2017, at 11:

Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Heinrich Schuchardt
Hello Simone, in your program all threads create random file names that are generated from the same name space. The initial value of the random number generator probably will be the same for all threads. This will lead to two threads trying to write the same file. Either use a Singleton for the f

Re: [Help-glpk] Thread Safety of GLPK

2017-08-30 Thread Simone Atzeni
Yes, I run the following command: "../configure --prefix=$HOME/usr --with-gmp” attached the output of “config”. I am working on a Red Hat Enterprise Linux Server release 7.3. Thanks. Simone ../configure --prefix=$HOME/usr --with-gmp checking for a BSD-compatible install... /usr/bin/install -c

Re: [Help-glpk] Questions regarding Simplex during Integer Optimization

2017-08-30 Thread Andrew Makhorin
> I want to set overall simplex parameters for an integer (linear) > optimization. I am little bit confused, that I “only” can use > glp_simplex (where I can set parameters like pricing, meth, etc.) > prior to the integer optimization. But then the MILP has no presolve > option and I seems that th