Modifying the Configuration File

By default, the program performs non-parallel computing. To perform parallel computing, modify the configuration file, that is, add the LDFLAGS parameter to the BiSheng Compiler.

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		# Default
OPTIM	:= -03 -Wall
DEBUG	:= -g –Wall –DOLB_DEBUG
CXXFLAGS	:= $(OPTIM)
CXXFLAGA	+= -std=c++14
ARPRG	:= ar
LDFLAGS	:= -Wl,-z,muldefs		# Allow repeated defining.
#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