Научный Open Source Опции

[Гость_Nils_*]

Тут будем рассказывать об Научном Open Source.


Scientific Linux

Пара скриншотов

SL - это релиз Linux, который создан совместными усилиями Fermilab и CERN при поддержке различных лабораторий и университетов со всего мира. Его исходной целью было стремление уменьшить дублирование усилий лабораторий и иметь общую инсталляционную базу для различных экспериментов.

Scientific Linux - официальный сайт (SL)


Полезные ссылки
Обзор свободных программ для численных расчётов

[Nils]

Организуем распределенные вычисления с помощью RPyC

RPyC - это библиотека для интеграции процессов Python на многих машинах/процессах. В этой статье рассматриваются преимущества и недостатки RPyC по сравнению с другими распределенными инфраструктурами Python, такими как XML-RPC и Pyro. Также, чтобы показать эту библиотеку в работе, приводятся несколько простых примеров использования RPyC.

полностью на сайте IBM

Обновления в Gerris

Gerris release notes/12-05-09
Major improvements include:

* Moving solid boundaries: this is an initial release, more will follow.
* New axisymmetric version.
* New non-linear shallow-water solver.
* The reference dimension of the GfsBox can be set.
* "2D3" ocean model has been replaced with a generalised 3D ocean code.
* New Map module for cartographic projections.
* New Terrain module for large height-field databases.
* New Tide module for FES2004 tidal atlas database.
* Major improvements to the VOF and surface tension code (as described in the JCP paper above).
* New Cook Strait tides example.
* New ship wave example.
* New object GfsOutputDropletSums for VOF droplets statistics.
* Vim dictionary and utilities.
* Overall improvements to code portability (including Mac OSX).
* Improvements to the Poisson and Crank-Nicholson diffusion coupling.
* Both GfsRefineSolid and GfsRefineSurface now work with implicit surfaces.
* Examples and tests are automatically cross-linked with the syntax reference.
* Numerous bug fixes.

Gerris release notes/09-07-21
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The main change for this release is dynamic load-balancing for parallel simulations. See Gerris in parallel and the new parallel Von Karmann vortex street example. Gerris has also been recently benchmarked on up to 2048 processors on several supercomputers. For the problem considered (a 128^3 lid-driven cavity), Gerris scaled linearly up to 512 processors.

There is also a new moving cylinder test case.

There are several important improvements and bug fixes for parallel simulations including:

* Overlapping communications and computations
* Important bug fix for graph partitioning
* gfs_domain_locate() uses a Cartesian array for fast indexing

The previous systematic traversal of all the GfsBoxes was very slow (when the number of boxes was large e.g. due to "splitting"). This was particularly noticeable for the VOF algorithm (which does many locate() calls to reconstruct local Cartesian stencils).

* New option '--event' for gerris2D/3D
* Entirely solid boxes can be used

They will be automatically removed from the simulation rather than making the simulation abort with an error message.

* GfsInitFraction should now work also for parallel simulations

It used to fail for domains containing disconnected GfsBoxes (which can happen for some domain decompositions in parallel).

* GfsOutputDropletSums and GfsRemoveDroplets should now work in parallel
* Major bug fix for GfsBoundaryPeriodic

Amazingly the implementation of the match() method seems to have been wrong right from the initial implementation (then part of BoundaryMpi). Yet, despite being completely inconsistent, this implementation managed to "work" undetected for several years... The bug also affected parallel simulations through inheritance to BoundaryMpi.

* GfsOutputSimulation can write "joined" parallel simulation files
* New gfsjoin2D, gfsjoin3D tools

These are replacing the gfsjoin script. Note however that they can only be used to join parallel files created using this and later versions of Gerris. Older parallel simulation files should still use the gfsjoin script.

сайт проекта gerris

Сообщение отредактировал Nils - 26.07.2009, 16:58