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108 lines
2.5 KiB
Markdown
108 lines
2.5 KiB
Markdown
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Using HMC in Grid version 0.5.1
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These are the instructions to use the Generalised HMC on Grid version 0.5.1.
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Disclaimer: GRID is still under active development so any information here can be changed in future releases.
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Command line options
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===================
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(relevant file GenericHMCrunner.h)
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The initial configuration can be changed at the command line using
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--StartType <your choice>
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valid choices, one among these
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HotStart, ColdStart, TepidStart, CheckpointStart
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default: HotStart
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example
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./My_hmc_exec --StartType HotStart
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The CheckpointStart option uses the prefix for the configurations and rng seed files defined in your executable and the initial configuration is specified by
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--StartTrajectory <integer>
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default: 0
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The number of trajectories for a specific run are specified at command line by
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--Trajectories <integer>
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default: 1
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The number of thermalization steps (i.e. steps when the Metropolis acceptance check is turned off) is specified by
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--Thermalizations <integer>
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default: 10
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Any other parameter is defined in the source for the executable.
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HMC controls
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===========
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The lines
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std::vector<int> SerSeed({1, 2, 3, 4, 5});
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std::vector<int> ParSeed({6, 7, 8, 9, 10});
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define the seeds for the serial and the parallel RNG.
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The line
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TheHMC.MDparameters.set(20, 1.0);// MDsteps, traj length
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declares the number of molecular dynamics steps and the total trajectory length.
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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 actions list:
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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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ScalarActionR;
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ScalarActionF;
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ScalarActionD;
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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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