Update documentation to make sure the correct cplex option file is us…

…ed on the HPC.

base/documentation/gh-pages/running_on_hpc/submitting_a_job.md

@@ -10,7 +10,10 @@ Remember to study the log report after your job finishes, so you can be more acc
 
 After having transferred our Balmorel model through WinSCP (see [previous page](access.md)), we need to submit a job. This means creating a job script that asks for the right amount of memory usage and time before completion. This is done through a job script, illustrated in the code snippet below. We refer to [this general guide](https://www.hpc.dtu.dk/?page_id=1416) by DTU Computing Center for the exact explanations of the different elements. Note that the paths in the `export` commands are specific to our setup at DTU's clusters. 
 
-The bottom commands assumes that the job script is submitted from inside your Balmorel folder, and that your Balmorel project contains a "scenario1" scenario - see [how to create new scenarios](../get_started/scenario_setup.md). The `--threads=$LSB_DJOB_NUMPROC` command makes sure that Balmorel does not use more cores than defined  in your job script (four in this case, due to `#BSUB -n 4`)
+The bottom commands assumes that the job script is submitted from inside your Balmorel folder, and that your Balmorel project contains a "scenario1" scenario - see [how to create new scenarios](../get_started/scenario_setup.md). The `threads=$LSB_DJOB_NUMPROC` command makes sure that Balmorel does not use more cores than defined  in your job script (four in this case, due to `#BSUB -n 4`)
+:::{warning}
+Please make sure to switch to the solver options file `cplex.op2`, by going into the `balgams.opt` file and setting `$Setglobal USEOPTIONFILE 2`. Otherwise CPLEX will overwrite the number of chosen threads and will ue more resources than requested.
+:::
 ```bash
 #!/bin/sh 
 ### General options 
@@ -48,7 +51,7 @@ export LD_LIBRARY_PATH=/appl/gams/47.6.0:$LD_LIBRARY_PATH
 # Go to model folder of your scenario - this assumes that the job script is at the same level of the Balmorel folder
 cd scenario1/model 
 # Run Balmorel
-gams Balmorel --threads=$LSB_DJOB_NUMPROC
+gams Balmorel threads=$LSB_DJOB_NUMPROC
 ```
 
 ## Submitting the Job from PuTTY