HMLQCD
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== General Information == | == General Information == | ||
| - | * Application's name: | + | * Application's name: '''Hadron Masses from Lattice QCD''' |
| - | * Virtual Research Community: | + | * Virtual Research Community: Computational Physics |
| - | * Scientific contact: | + | * Scientific contact: Artan Borici |
| - | * Technical contact: | + | * Technical contact: Artan Borici |
| - | * Developers: | + | * Developers: A.Boriçi, D.Xhako, R.Zeqirllari |
| - | * Web site: | + | * Web site: - |
== Short Description == | == Short Description == | ||
| - | + | LQCD is a quantum field theory whose correlation functions are described by means of | |
| + | vacuum expectation values. These are path integrals whose measure is defined on four | ||
| + | dimensional hypercubic lattices. The computation of path integrals is performed via | ||
| + | Markov Chain Monte Carlo sampling of the underlying positive definite measure. The | ||
| + | lattice QCD measure is a non-local function on the degrees of freedom which makes the | ||
| + | evolution in configuration space very slow with large autocorrelation times of certain | ||
| + | observables. At any Markov step several huge ans sparse linear systems have to be | ||
| + | solved. Once the gauge field configurations are produced, one stores them in the disk | ||
| + | for further analysis. The mass spectrum analysis involves computation of quark | ||
| + | propagators, which are the solution of huge linear systems of Dirac operators on the | ||
| + | lattice. As a typical example on 32^3 by 64 lattices one needs thousands of Monte | ||
| + | Carlo steps to compute one statistically independent configuration. One Krylov solver | ||
| + | needs typically hundreds of iterations and one multiplication by the Wilson-Dirac | ||
| + | operator needs 1Gflops. | ||
| + | QCD lattices must be scaled appropriately in order to get physical results. This scalability requirement needs HPC techniques. | ||
== Problems Solved == | == Problems Solved == | ||
| - | + | Lattice QCD has become an indispensable tool both for particle and nuclear physics. It | |
| + | has fundamental role in describing elementary particle interactions from first principles. | ||
| + | In the application side it has become a tool to understand small nuclear systems from | ||
| + | first principles. | ||
== Scientific and Social Impact == | == Scientific and Social Impact == | ||
| - | + | Using local chiral fermions saves two orders of magnitude computing resources which is | |
| + | translated in physical results with unprecedented accuracy. | ||
| + | Increased social support for scientific communities. | ||
== Collaborations and Beneficiaries == | == Collaborations and Beneficiaries == | ||
| - | + | - TIRLatt (Tirana lattice QCD group) | |
| + | - International lattice QCD groups will benefit from expanded libraries of QCDLAB and | ||
| + | fermiQCD | ||
== Technical Features and HP-SEE Implementation == | == Technical Features and HP-SEE Implementation == | ||
| - | * Primary programming language: | + | * Primary programming language: C/C++/Matlab/Octave (Matlab compiler) |
| - | * Parallel programming paradigm: | + | * Parallel programming paradigm: MPI/MPITB(Octave)/Parallel Computing Toolbox (Matlab) |
| - | * Main parallel code: | + | * Main parallel code: C/C++/Matlab |
| - | * Pre/post processing code: | + | * Pre/post processing code: - |
| - | * Application tools and libraries: | + | * Application tools and libraries: |
| - | * Number of cores required: | + | * Number of cores required: Limited to available number of CPUs |
| - | * Minimum RAM/core required: | + | * Minimum RAM/core required: $GB |
| - | * Storage space during a single run: | + | * Storage space during a single run: 1TB |
| - | * Long-term data storage: | + | * Long-term data storage: 2TB |
== Usage Example == | == Usage Example == | ||
| - | + | - | |
== Publications == | == Publications == | ||
| - | |||
* ... | * ... | ||
Revision as of 12:56, 10 July 2011
Contents |
General Information
- Application's name: Hadron Masses from Lattice QCD
- Virtual Research Community: Computational Physics
- Scientific contact: Artan Borici
- Technical contact: Artan Borici
- Developers: A.Boriçi, D.Xhako, R.Zeqirllari
- Web site: -
Short Description
LQCD is a quantum field theory whose correlation functions are described by means of vacuum expectation values. These are path integrals whose measure is defined on four dimensional hypercubic lattices. The computation of path integrals is performed via Markov Chain Monte Carlo sampling of the underlying positive definite measure. The lattice QCD measure is a non-local function on the degrees of freedom which makes the evolution in configuration space very slow with large autocorrelation times of certain observables. At any Markov step several huge ans sparse linear systems have to be solved. Once the gauge field configurations are produced, one stores them in the disk for further analysis. The mass spectrum analysis involves computation of quark propagators, which are the solution of huge linear systems of Dirac operators on the lattice. As a typical example on 32^3 by 64 lattices one needs thousands of Monte Carlo steps to compute one statistically independent configuration. One Krylov solver needs typically hundreds of iterations and one multiplication by the Wilson-Dirac operator needs 1Gflops. QCD lattices must be scaled appropriately in order to get physical results. This scalability requirement needs HPC techniques.
Problems Solved
Lattice QCD has become an indispensable tool both for particle and nuclear physics. It has fundamental role in describing elementary particle interactions from first principles. In the application side it has become a tool to understand small nuclear systems from first principles.
Scientific and Social Impact
Using local chiral fermions saves two orders of magnitude computing resources which is translated in physical results with unprecedented accuracy. Increased social support for scientific communities.
Collaborations and Beneficiaries
- TIRLatt (Tirana lattice QCD group) - International lattice QCD groups will benefit from expanded libraries of QCDLAB and fermiQCD
Technical Features and HP-SEE Implementation
- Primary programming language: C/C++/Matlab/Octave (Matlab compiler)
- Parallel programming paradigm: MPI/MPITB(Octave)/Parallel Computing Toolbox (Matlab)
- Main parallel code: C/C++/Matlab
- Pre/post processing code: -
- Application tools and libraries:
- Number of cores required: Limited to available number of CPUs
- Minimum RAM/core required: $GB
- Storage space during a single run: 1TB
- Long-term data storage: 2TB
Usage Example
-
Publications
- ...
