a st ro - p h / 97 03 18 3 v 1 2 7 M ar 1 99 7 Hydra : A Parallel Adaptive Grid Code
نویسندگان
چکیده
We describe the first parallel implementation of an adaptive particle-particle, particle-mesh code with smoothed particle hydrodynamics. Parallelisation of the serial code, " Hydra " , is achieved by using CRAFT, a Cray proprietary language which allows rapid implementation of a serial code on a parallel machine by allowing global addressing of distributed memory. The collisionless variant of the code has already completed several 16.8 million particle cosmological simulations on a 128 processor Cray T3D whilst the full hy-drodynamic code has completed several 4.2 million particle combined gas and dark matter runs. The efficiency of the code now allows parameter-space explorations to be performed routinely using 64 3 particles of each species. A complete run including gas cooling, from high redshift to the present epoch requires approximately 10 hours on 64 processors. In this paper we present implementation details and results of the performance and scalability of the CRAFT version of Hydra under varying degrees of particle clustering.
منابع مشابه
ar X iv : a st ro - p h / 97 11 24 4 v 1 2 0 N ov 1 99 7 POPULATION SYNTHESIS OF HIGH ENERGY TRANSIENTS RELATIVISTIC BINARY MERGING RATES
متن کامل
ar X iv : a st ro - p h / 97 03 16 1 v 1 2 5 M ar 1 99 7 The
The case is simple: there is no compelling theoretical argument against a cosmological constant and ΛCDM is the only CDM model that is consistent with all present observations. ΛCDM has two noteworthy features: it can be falsified in the near future (the prediction q0 ∼ − 1 2 is an especially good test), and, if correct, it has important implications for fundamental physics.
متن کاملar X iv : a st ro - p h / 97 03 16 1 v 2 2 6 M ar 1 99 7 The Case for ΛCDM
The case is simple: there is no compelling theoretical argument against a cosmological constant and ΛCDM is the only CDM model that is consistent with all present observations. ΛCDM has two noteworthy features: it can be falsified in the near future (the prediction q0 ∼ − 1 2 is an especially good test), and, if correct, it has important implications for fundamental physics.
متن کاملar X iv : a st ro - p h / 99 03 35 2 v 1 2 3 M ar 1 99 9 GENESIS : A high – resolution code for 3 D relativistic hydrodynamics
The main features of a three dimensional, high–resolution special relativistic hydro code based on relativistic Riemann solvers are described. The capabilities and performance of the code are discussed. In particular, we present the results of extensive test calculations which demonstrate that the code can accurately and efficiently handle strong shocks in three spatial dimensions. Results of t...
متن کامل