Recompile OpenFoam from double precison to single precision
————Why?
For, I just want to play with GPGPU
Some of the ATI cards does not support double precision for openCL；
use speedIT openfoam plugin on cuda platform。
Follow the instructions for compile OF
http://www.openfoam.com/download/source.php
————–preparation
make sure you have install the Double precison OF sucessfully,
There are quite a lot dependencies, you must meet, or the compiling will stop with error.
you DO need to download src pack.
check gcc version, must be >=4.4,
export WM_COMPILER=<pathofgcc44>/gcc
or edit the wmake/rulels/<platform>/c and c++
% cd $HOME/OpenFOAM/OpenFOAM-1.7.1/wmake/rules/linux64Gcc
% vim c
cc = gcc44 -m64
% vim c++
CC = g++44 -m64
—————edit env. var.
gedit $WM_PROJECT_DIR /etc/bashrc
# change from default DP to SP
the file look like
# WM_ARCH_OPTION = 32 | 64
: ${WM_ARCH_OPTION:=64}; export WM_ARCH_OPTION
# this is the OS , 32bit Linux or 64bit linux, leave it because you just recompile it
# WM_PRECISION_OPTION = DP | SP
: ${WM_PRECISION_OPTION:=DP}; export WM_PRECISION_OPTION
————check the env
$ source ~/.bashrc
$ env|grep WM_*
WM_OPTIONS=linux64GccSPOpt
WM_PRECISION_OPTION=SP # just check this line,
WM_ARCH_OPTION=64 #if you OS is 64bit,
—————–test compilation
$foamSystemCheck
—————-compile
Go to the top-level source directory $WM_PROJECT_DIR
and execute the top-level build script ./Allwmake.
——————test
$icoFoam
Thirdparty
————done.
Tested on OF1.7.1 Linux64 or Linux32
May 2011
CC-BY-NC 4.0 licensed free for non-commercial usage
Author: Qingfeng XIA
copyright (C) 2011-2020
http://www.iesensor.com
please keep the original link in your reference.
http://www.iesensor.com/blog/2011/05/20/recompile-openfoam-from-double-precison-to-single-precision/
