SKIRT: Hybrid parallelization of radiative transfer simulations

We describe the design, implementation and performance of the new hybrid parallelization scheme in our Monte Carlo radiative transfer code SKIRT, which has been used extensively for modelling the continuum radiation of dusty astrophysical systems including late-type galaxies and dusty tori. The hybr...

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Published in:Astronomy and computing Vol. 20; pp. 16 - 33
Main Authors: Verstocken, S., Van De Putte, D., Camps, P., Baes, M.
Format: Journal Article
Language:English
Published: Elsevier B.V 01.07.2017
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ISSN:2213-1337, 2213-1345
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Abstract We describe the design, implementation and performance of the new hybrid parallelization scheme in our Monte Carlo radiative transfer code SKIRT, which has been used extensively for modelling the continuum radiation of dusty astrophysical systems including late-type galaxies and dusty tori. The hybrid scheme combines distributed memory parallelization, using the standard Message Passing Interface (MPI) to communicate between processes, and shared memory parallelization, providing multiple execution threads within each process to avoid duplication of data structures. The synchronization between multiple threads is accomplished through atomic operations without high-level locking (also called lock-free programming). This improves the scaling behaviour of the code and substantially simplifies the implementation of the hybrid scheme. The result is an extremely flexible solution that adjusts to the number of available nodes, processors and memory, and consequently performs well on a wide variety of computing architectures.
AbstractList We describe the design, implementation and performance of the new hybrid parallelization scheme in our Monte Carlo radiative transfer code SKIRT, which has been used extensively for modelling the continuum radiation of dusty astrophysical systems including late-type galaxies and dusty tori. The hybrid scheme combines distributed memory parallelization, using the standard Message Passing Interface (MPI) to communicate between processes, and shared memory parallelization, providing multiple execution threads within each process to avoid duplication of data structures. The synchronization between multiple threads is accomplished through atomic operations without high-level locking (also called lock-free programming). This improves the scaling behaviour of the code and substantially simplifies the implementation of the hybrid scheme. The result is an extremely flexible solution that adjusts to the number of available nodes, processors and memory, and consequently performs well on a wide variety of computing architectures.
Author Verstocken, S.
Van De Putte, D.
Camps, P.
Baes, M.
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Keywords Radiative transfer — methods
Concurrency control — software and its engineering
Multithreading — software and its engineering
Multiprocessing / multiprogramming / multitasking — software and its engineering
Numerical — software and its engineering
Process synchronization
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Snippet We describe the design, implementation and performance of the new hybrid parallelization scheme in our Monte Carlo radiative transfer code SKIRT, which has...
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SubjectTerms Concurrency control — software and its engineering
Multiprocessing / multiprogramming / multitasking — software and its engineering
Multithreading — software and its engineering
Numerical — software and its engineering
Process synchronization
Radiative transfer — methods
Title SKIRT: Hybrid parallelization of radiative transfer simulations
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