How to run HX on multiple processors?

Question

How to run HX to use multiple processor?

NarendraSingh · Answer

*  		Environment variables set to activate multiple processors vary from system to system.

*  		Following are for Linux (example shows in csh setting it to 2)

*  				setenv MKL_NPROCS 2

*  		setenv OMP_NUM_THREADS 2

*  		For other systems one of the below will work - so setting all is not a bad idea.

*  				OMP_NUM_THREADS

*  		MKL_NPROCS

MP_SET_NUMTHREADS

P_NUMBER_OF_THREADS

MLIB_NUMBER_OF_THREADS

*  		Please be aware that this may not improve the speed at all, and on some cheap motherboards with fast CPU it may actually run slower.

*  		But HX always uses out-of-core solution (as the problems are large) and hence it is I/O intensive. Hence the gains will be less.

*  		It is possible to force HX to use in-core solutions. But for the kind of problems, one needs over 20 GB Ram. To force this, you should set MemoryForSolver to -1 in the .hx/.tcl file

*  				pset MemoryForSolver -1