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Old   May 1, 2011, 16:29
Default Two OpenFOAM installations in parallel? (DP + SP)
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Klaus
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Hello,

I've OpenFOAM with double precision installed as recommended in /home/user/OpenFOAM.

I need a single precision installation as well (with some add-ons) - the plan is to build/install it in /home/user/OpenFOAMSP

I don't want to spoil the existing double precision installation.

Are the following steps suficient to avoid problems?

1. Add . $HOME/OpenFOAMSP/OpenFOAM-1.7.x/etc/bashrc to $HOME/.bashrc
2. Change FOAM_INST_DIR to /home/user/OpenFOAMSP and $WM_PROJECT_DIR to /home/user/OpenFOAMSP/OpenFOAM-1.7.x

Klaus
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Old   May 2, 2011, 02:11
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Bernhard
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I think sourcing both /bashrc files in ~/.bashrc will cause problems.

If you put it like this
Code:
alias startFoam='source $HOME/OpenFOAM/OpenFOAM-1.7.x/etc/bashrc'
alias startFoamSP='source $HOME/OpenFOAM/OpenFOAM-1.7.xSP/etc/bashrc'
You can type startFoam in your shell when you want to use your original install, and startFoamSP for the single precision version.

Best way to change the install, is to change the variable foamInstall in bashrc. Furthermore, you probably don't recompile the ThirdParty software, so you have that variable in you bashrc as well.
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Old   May 2, 2011, 03:04
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Mark Olesen
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Quote:
Originally Posted by klausb View Post
Hello,

I've OpenFOAM with double precision installed as recommended in /home/user/OpenFOAM.

I need a single precision installation as well (with some add-ons) - the plan is to build/install it in /home/user/OpenFOAMSP

I don't want to spoil the existing double precision installation.

Are the following steps suficient to avoid problems?

1. Add . $HOME/OpenFOAMSP/OpenFOAM-1.7.x/etc/bashrc to $HOME/.bashrc
2. Change FOAM_INST_DIR to /home/user/OpenFOAMSP and $WM_PROJECT_DIR to /home/user/OpenFOAMSP/OpenFOAM-1.7.x

Klaus

I don't see why you'd want or need to have a separate installation directory. There is absolutely no problem having different compiler/precision combinations in the same FOAM_INST_DIR. The only thing you need to do is have the correct variables set.

For a "once-of", simply use the "wmSP" or "wmDP" aliases set the corresponding variables.
For a more permanent switch, the easiest is to simpy copy the etc/bashrc. For example,
Code:
cp etc/bashrc etc/bashrc-sp
cp etc/bashrc etc/bashrc-dp
As hard-code the WM_PRECISION_OPTION.

You can use the same idea if you are using a different compiler (type or version).
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Old   May 2, 2011, 03:08
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Good point, what I posted can be used if you want to keep different version of OpenFOAM seperate (e.g. 1.6-ext and 1.7)
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