JUSTUS2/Software/Turbomole

Description	Content
module load	chem/turbomole
Availability	bwUniCluster_2.0 | bwForCluster_Chemistry
License	Commerical
Citing	See Turbomole manual
Links	Homepage | Documentation
User Forum	external

1 Description

Turbomole is a general purpose quantum chemistry software package for ab initio electronic structure calculations and provides:

• ground state calculations for methods such as Hartree-Fock, DFT, MP2, and CCSD(T);
• excited state calculations at different levels such as full RPA, TDDFT, CIS(D), CC2, an ADC(2);
• geometry optimizations, transition state searches, molecular dynamics calculations;
• property and spectra calculations such as IR, UV/VIS, Raman, and CD;
• approximations like resolution-of-the-identity (RI) to speed-up the calculations without introducing uncontrollable or unknown errors; as well as
• parallel versions for all kind of jobs.

For more information on Turbmole's features please visit http://www.turbomole-gmbh.com/program-overview.html.

2 Versions and Availability

On the command line interface (CLI) of a particular bwHPC cluster a list of all available Turbomole versions can be inquired as followed

$ module avail chem/turbomole

A current list of the versions available on the bwUniCluster and bwForClusters can be found here: https://www.bwhpc.de/software.php

2.1 bwUniCluster 2.0

• Turbomole 7.4.1

2.2 bwForCluster JUSTUS 2

• Turbomole 7.5
• Turbomole 7.4.1

2.3 Parallel computing

The Turbomole Module subsumes all available parallel computing variants of Turbomole's binaries. Turbomole defines the following parallel computing variants:

• SMP = Shared-memory parallel computing based on OpenMP and Fork() with the latter using separated address spaces.
• MPI = Message passing interface protocol based parallel computing

However only one of the parallel variants or the sequential variant can be loaded at once and most Turbomole's binaries support only 1 or 2 of the parallelization variants. Like for Turbomole installations without the Module system of the bwHPC clusters, the variants have to be triggered by the environment variable $PARA_ARCH.

3 Usage

3.1 Before loading the Module

Before loading the Turbomole Module the parallel computing variant has to be defined via the environment variable $PARA_ARCH using the abbreviations SMP or MPI, e.g.:

$ export PARA_ARCH=MPI

will later load the MPI binary variants. If the variable $PARA_ARCH is not defined or empty, the sequential binary variants will be active once the Turbomole Module is loaded.

3.2 Loading the Module

You can load the default version of Turbomole with the command:

$ module load chem/turbomole

The Turbomole Module does not depend on any other Module, but on the variable $PARA_ARCH. Moreover, Turbomole provides its own libraries regarding OpenMP, Fork(), and MPI based parallelization. If you wish to load a specific (older) version you can do so by executing e.g.:

$ module load chem/turbomole/7.4.1

to load the version 7.4.1

3.3 Switching between different parallel variants

To switch between the different parallel variants provided by the Turbomole Module, simply define the new parallel variant via $PARA_ARCH and load the Module again. Note that for switching between the parallel variants unloading of the Turbomole Module is not required. For instance to change to the MPI variant, execute:

$ export PARA_ARCH=MPI
$ module load chem/turbomole

3.4 Turbomole binaries

The Turbomole software package consists of a set of stand-alone program binaries providing different features and parallelization support:

Binary	Features	OpenMP	Fork	MPI
define	Interactive input generator	no	no	no
dscf	Energy calculations	yes	yes	yes
grad	Gradient calculations	yes	yes	yes
ridft	Energy calc. with fast Coulomb approximation	no	yes	yes
rdgrad	Gradient calc. with fast Coulomb approximation	yes	yes	yes
ricc2	Electronic excitation energies, transition moments and properties of excited states	yes	no	yes
statpt	Hessian and coordinate update for stationary point search	no	no	no
aoforce	Analytic calculation of force constants, vibrational frequencies and IR intensities	yes	yes	yes
escf	Calc. of time dependent and dielectric properties	yes	yes	yes
egrad	gradients and first-order properties of excited states	yes	no	yes
odft	Orbital-dependent energy calc.	yes	no	no

For the complete set of binaries and more detailed description of their features read here.

3.5 Turbomole tools

Turbomole's tool set contains scripts and binaries that help to prepare, execute workflows (such as geometry optimisation) and postprocess results.

Script	Type	Description
x2t	Preparation	Converts XYZ coordinates into Turbomole coordinates.
sdg	Preparation	Shows data group from control file: for example$ sdg coordshows current Turbomole coordinates used.
jobex	Optimization workflow	Shell script that controls and executes automatic optimizations of molecular geometry parameters.
tm2molden	Postprocessing	Creates a molden format input file for the Molden program.
eiger	Postprocessing	Script front-end of program eigerf to display HOMO-LUMO gap and MO eigenvalues.

For the complete set of tools and more detailed description of their features read here.

3.6 Disk Usage

By default, scratch files of Turbomole binaries are placed in the directory of Turbomole binary execution. Please do not run your Turbomole calculations in your $HOME or $WORK directory.

4 Examples

4.1 Single node jobs

4.1.1 Template provided by Turbomole Module

The Turbomole Module provides a simple job script example of Cubane (C8H8) that runs an energy relaxation via MPI parallel dscf using 4 cores on a single node and its local file system. To simply run the example do the following steps:

$ module load chem/turbomole
$ mkdir -vp ~/Turbomole-example/
$ cd ~/Turbomole-examples/
$ cp -r $TURBOMOLE_EXA_DIR/* ~/Turbmole-example/
$ sbatch bwHPC_turbomole_single-node_tmpdir_example.sh

The last step submits the job example script bwHPC_turbomole_single-node_example.sh to the queueing system. Once started on a compute node, all calculations will be done under an unique directory on the local file system of that particular compute node.

4.1.2 Geometry optimization

To do a geometry optimization of the previous job example modify bwHPC_turbomole_single-node_tmpdir_example.sh by replacing the following line

time dscf > dscf.out 2>&1

with

time jobex -dscf -keep 2>&1

and submit the modified script to the queueing system on bwForCluster JUSTUS 2 via sbatch and bwUniCluster also via sbatch, respectively. The Turbomole command jobex controls the call of all the required Turbomole binaries for the geometry optimization.

5 Turbomole-Specific Environment Variables

To see a list of all Turbomole environments set by the 'module load'-command do the following:

module show chem/turbomole 2>&1 | grep -E '(setenv|prepend-path)'

6 Version-Specific Information

For specific information about the Turbomole version (e.g. 7.5) to be loaded do the following:

module help chem/turbomole/7.5

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