Global Optimization

Benchmarks for Global Optimization.

Lennard-Jones 38

This benchmark requires that the global optimization algorithm is run starting from the 100 randomly generated (minimized) Lennard-Jones structures. Runs that are greater than 0.001 energy units from the known global minimum are considered failures. If a run was successful, the number of force calls needed to reach the global minimum is recorded.

The starting structures can be downloaded here.

Entries for this benchmark must record the average number number of force calls as force_calls in benchmark.dat, the maximum number of force calls as force_calls_max, and the minimum number of force calls as force_calls_min.

Entry Code <N> min N max N
gmin-csm

Date: 06 Aug 2014 Contributor: Jacob Stevenson and David Wales Code: wales-27058.tar.bz2 Input files: gmin-csm.tgz

GMIN 6.421e+03 7.700e+01 2.698e+04
gmin-symmetrise

Date: 06 Aug 2014 Contributor: Jacob Stevenson and David Wales Code: wales-27058.tar.bz2 Input files: gmin-symmetrise.tgz

GMIN 2.271e+04 7.200e+02 1.212e+05
gmin-nosym

Date: 06 Aug 2014 Contributor: Jacob Stevenson and David Wales Code: wales-27058.tar.bz2 Input files: gmin-nosym.tgz

GMIN 2.660e+05 6.457e+03 1.170e+06
eon-basinhopping1

Date: 20 Aug 2013 Contributor: Sam Chill Input files: eon-basinhopping.tgz

Eon 5.080e+05 4.579e+03 1.796e+06
pele-basinhopping

Date: 29 Aug 2013 Contributor: Jacob Stevenson Code: pele-a68ec5.tgz Input files: pele-basinhopping.tgz

pele 5.216e+05 9.447e+03 2.534e+06

Lennard-Jones 75

This benchmark is a global optimization benchmark for a Lennard-Jones cluster with 75 atoms. The same criterion apply as in the LJ38 benchmark above.

The starting structures can be downloaded here.

Entry Code <N> min N max N
gmin1

Date: 09 Jan 2014 Contributor: David Wales Input files: gmin.tgz

GMIN 6.069e+04 1.100e+03 3.101e+05

Binary Lennard-Jones 100

This benchmark test the performance of global optimization algorithms on a binary Lennard-Jones A42B58 system with a size ratio of 1.3. The form of the potential is

$$ E = 4 \sum_{i < j} \left[ \left( \frac{\sigma_{\alpha \beta}}{r_{ij}} \right)^{12} - \left( \frac{\sigma_{\alpha \beta}}{r_{ij}} \right)^{6} \right] $$

where $\alpha$ and $\beta$ are the atom type of atoms $i$ and $j$, respectively. Here $\epsilon_{AA}$=$\epsilon_{AB}$=$\epsilon_{BB}$=1, $\sigma_{AA}$=1, $\sigma_{BB}$=1.3, and $\sigma_{AB}$=($\sigma_{AA}$+$\sigma_{BB}$)/2. Previous studies have reported a putative global minimum energy of -604.796307.

This benchmark requires that the global optimization algorithm is run starting from the 100 randomly generated (minimized) Lennard-Jones structures. The starting structures can be downloaded here. The global optimization algorithm will be run for not more than two million energy (force) evaluations for each starting structure.

Entries for this benchmark must record the average lowest energy found at the end of each run as average_energy in benchmark.dat as well as the largest and smallest energies (min_energy and max_energy) found at the end of the 100 runs.

Entry Code <E> min E max E
gmin

Date: 07 Aug 2014 Contributor: David Wales and Jacob Stevenson Code: wales-27058.tar.bz2 Input files: gmin.tgz

GMIN -5.895e+02 -5.990e+02 -5.786e+02
eon-basinhopping1

Date: 21 May 2014 Contributor: Sam Chill Input files: eon-basinhopping.tgz

Eon -5.846e+02 -5.961e+02 -5.741e+02

TIP4Pn(n=10,15,20)

global minimum of TIP4P<sub>20</sub>

This benchmark requires that the global optimization algorithm is run starting from the supplied randomly generated (minimized) structures. Runs that are greater than 0.001 energy units from the known global minimum are considered failures. If a run was successful, the number of force calls needed to reach the global minimum is recorded.

The 10000, 500, and 100 starting structures for n = 10, 15, and 20 can be downloaded here, here, and here.

Entries for this benchmark must record the average number number of force calls as force_calls in benchmark.dat, the maximum number of force calls as force_calls_max, and the minimum number of force calls as force_calls_min.

Entry Code <N> min N max N
gmin-tbp1

Date: 05 May 2014 Contributor: James Farrell Input files: gmin-tbp.tgz

GMIN 1.610e+04 1.210e+02 1.451e+05
gmin1

Date: 05 May 2014 Contributor: James Farrell Input files: gmin.tgz

GMIN 1.624e+04 1.210e+02 1.484e+05
Entry Code <N> min N max N
gmin-tbp1

Date: 05 May 2014 Contributor: James Farrell Input files: gmin-tbp.tgz

GMIN 6.254e+05 2.345e+03 6.177e+06
gmin1

Date: 05 May 2014 Contributor: James Farrell Input files: gmin.tgz

GMIN 6.706e+05 4.549e+03 5.026e+06
Entry Code <N> min N max N
gmin-tbp1

Date: 09 May 2014 Contributor: James Farrell Input files: gmin-tbp.tgz

GMIN 2.557e+07 5.973e+05 1.434e+08
gmin1

Date: 09 May 2014 Contributor: James Farrell Input files: gmin.tgz

GMIN 2.860e+07 4.412e+05 1.419e+08