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109 lines
2.6 KiB
Markdown
109 lines
2.6 KiB
Markdown
---
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title : "Documentation"
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author_profile: false
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excerpt: "Using HMC"
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header:
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overlay_color: "#5DADE2"
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permalink: /docs/theories/hmc/
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sidebar:
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nav : docs
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---
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Using HMC in Grid version 0.7.0
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These are the instructions to use the Generalised HMC on Grid version 0.7.0.
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Disclaimer: GRID is still under active development so any information provided here can be changed in future releases.
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General
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=======
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$$ \mathbf{X}\_{n,p} = \mathbf{A}\_{n,k} \mathbf{B}\_{k,p} $$
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$$ \langle O \rangle = \int O e^{-S(\psi)} d\psi $$
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Command line options
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====================
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(relevant file `GenericHMCrunner.h`)
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List of command line options, specific for HMC
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* ```--StartingType <string>```
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Choices: HotStart, ColdStart, TepidStart, CheckpointStart
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* ```--StartingTrajectory <integer>```
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Only for CheckpointStart, ignored otherwise.
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Expected format of the filename is ```<config prefix>.<integer>``` for the configuration and ```<rng file prefix>.<integer>```
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* ```--Trajectories <integer>```
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Number of trajectories in this run, excluding the thermalization steps. Default: 1.
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* ```--Thermalizations <integers>```
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Default: 10
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* ```--ParameterFile <string>```
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The filename for the input parameters deserialisation.
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All of them, except the starting trajectory, can be overridden by the input file (but this behaviour can be easily changed by the user writing the source file).
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Actions
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======
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Action names are defined in the file
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lib/qcd/Actions.h
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Gauge action names list:
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```
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WilsonGaugeActionR;
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WilsonGaugeActionF;
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WilsonGaugeActionD;
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PlaqPlusRectangleActionR;
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PlaqPlusRectangleActionF;
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PlaqPlusRectangleActionD;
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IwasakiGaugeActionR;
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IwasakiGaugeActionF;
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IwasakiGaugeActionD;
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SymanzikGaugeActionR;
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SymanzikGaugeActionF;
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SymanzikGaugeActionD;
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ConjugateWilsonGaugeActionR;
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ConjugateWilsonGaugeActionF;
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ConjugateWilsonGaugeActionD;
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ConjugatePlaqPlusRectangleActionR;
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ConjugatePlaqPlusRectangleActionF;
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ConjugatePlaqPlusRectangleActionD;
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ConjugateIwasakiGaugeActionR;
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ConjugateIwasakiGaugeActionF;
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ConjugateIwasakiGaugeActionD;
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ConjugateSymanzikGaugeActionR;
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ConjugateSymanzikGaugeActionF;
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ConjugateSymanzikGaugeActionD;
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```
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Scalar action names list
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```
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ScalarActionR;
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ScalarActionF;
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ScalarActionD;
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```
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each of these action accept one single parameter at creation time (beta).
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Example for creating a Symanzik action with beta=4.0
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SymanzikGaugeActionR(4.0)
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The suffixes R,F,D in the action names refer to the Real
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(the precision is defined at compile time by the --enable-precision flag in the configure),
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Float and Double, that force the precision of the action to be 32, 64 bit respectively.
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