Modifying the Configuration File

By default, the program performs non-parallel computing. To perform parallel computing, modify the configuration file.

Procedure

Use PuTTY to log in to the server as the root user.
Edit the config.mk file in the olb-1.4r0 directory.
```
vim config.mk
```

Press i to enter the insert mode and modify the file as follows:

#CXX	:= g++			# Default
CXX	:= mpicxx
#CC		:= gcc			# Default
CC		:= mpicc
OPTIM	:= -03 -Wall –march=native –mtune=native
DEBUG	:= -g –Wall –DOLB_DEBUG
CXXFLAGS	:= $(OPTIM)
CXXFLAGA	+= -std=c++14
ARPRG	:= ar
LDFLAGS	:=
#PARALLEL_MODE	:= OFF
PARALLEL_MODE	:= HYBRID
MPIFLAGS	:=
OMPFLAGS	:= -fopenmp
BUILDTYPE	:= generic
FEATURES	:=

Press Esc, type :wq!, and press Enter to save the file and exit.

Parent topic: Installing OpenLB