mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-16 02:35:36 +00:00
108 lines
2.5 KiB
Markdown
108 lines
2.5 KiB
Markdown
Using HMC in Grid version 0.5.1
|
|
|
|
These are the instructions to use the Generalised HMC on Grid version 0.5.1.
|
|
Disclaimer: GRID is still under active development so any information here can be changed in future releases.
|
|
|
|
|
|
Command line options
|
|
===================
|
|
(relevant file GenericHMCrunner.h)
|
|
The initial configuration can be changed at the command line using
|
|
--StartType <your choice>
|
|
valid choices, one among these
|
|
HotStart, ColdStart, TepidStart, CheckpointStart
|
|
default: HotStart
|
|
|
|
example
|
|
./My_hmc_exec --StartType HotStart
|
|
|
|
The CheckpointStart option uses the prefix for the configurations and rng seed files defined in your executable and the initial configuration is specified by
|
|
--StartTrajectory <integer>
|
|
default: 0
|
|
|
|
The number of trajectories for a specific run are specified at command line by
|
|
--Trajectories <integer>
|
|
default: 1
|
|
|
|
The number of thermalization steps (i.e. steps when the Metropolis acceptance check is turned off) is specified by
|
|
--Thermalizations <integer>
|
|
default: 10
|
|
|
|
|
|
Any other parameter is defined in the source for the executable.
|
|
|
|
HMC controls
|
|
===========
|
|
|
|
The lines
|
|
|
|
std::vector<int> SerSeed({1, 2, 3, 4, 5});
|
|
std::vector<int> ParSeed({6, 7, 8, 9, 10});
|
|
|
|
define the seeds for the serial and the parallel RNG.
|
|
|
|
The line
|
|
|
|
TheHMC.MDparameters.set(20, 1.0);// MDsteps, traj length
|
|
|
|
declares the number of molecular dynamics steps and the total trajectory length.
|
|
|
|
|
|
Actions
|
|
======
|
|
|
|
Action names are defined in the file
|
|
lib/qcd/Actions.h
|
|
|
|
Gauge actions list:
|
|
|
|
WilsonGaugeActionR;
|
|
WilsonGaugeActionF;
|
|
WilsonGaugeActionD;
|
|
PlaqPlusRectangleActionR;
|
|
PlaqPlusRectangleActionF;
|
|
PlaqPlusRectangleActionD;
|
|
IwasakiGaugeActionR;
|
|
IwasakiGaugeActionF;
|
|
IwasakiGaugeActionD;
|
|
SymanzikGaugeActionR;
|
|
SymanzikGaugeActionF;
|
|
SymanzikGaugeActionD;
|
|
|
|
|
|
ConjugateWilsonGaugeActionR;
|
|
ConjugateWilsonGaugeActionF;
|
|
ConjugateWilsonGaugeActionD;
|
|
ConjugatePlaqPlusRectangleActionR;
|
|
ConjugatePlaqPlusRectangleActionF;
|
|
ConjugatePlaqPlusRectangleActionD;
|
|
ConjugateIwasakiGaugeActionR;
|
|
ConjugateIwasakiGaugeActionF;
|
|
ConjugateIwasakiGaugeActionD;
|
|
ConjugateSymanzikGaugeActionR;
|
|
ConjugateSymanzikGaugeActionF;
|
|
ConjugateSymanzikGaugeActionD;
|
|
|
|
|
|
ScalarActionR;
|
|
ScalarActionF;
|
|
ScalarActionD;
|
|
|
|
|
|
each of these action accept one single parameter at creation time (beta).
|
|
Example for creating a Symanzik action with beta=4.0
|
|
|
|
SymanzikGaugeActionR(4.0)
|
|
|
|
The suffixes R,F,D in the action names refer to the Real
|
|
(the precision is defined at compile time by the --enable-precision flag in the configure),
|
|
Float and Double, that force the precision of the action to be 32, 64 bit respectively.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|