mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-10 07:55:35 +00:00
59 lines
2.4 KiB
Markdown
59 lines
2.4 KiB
Markdown
# Grid [](https://travis-ci.org/paboyle/Grid)
|
|
Data parallel C++ mathematical object library
|
|
|
|
Last update 2015/7/30
|
|
|
|
This library provides data parallel C++ container classes with internal memory layout
|
|
that is transformed to map efficiently to SIMD architectures. CSHIFT facilities
|
|
are provided, similar to HPF and cmfortran, and user control is given over the mapping of
|
|
array indices to both MPI tasks and SIMD processing elements.
|
|
|
|
* Identically shaped arrays then be processed with perfect data parallelisation.
|
|
* Such identically shapped arrays are called conformable arrays.
|
|
|
|
The transformation is based on the observation that Cartesian array processing involves
|
|
identical processing to be performed on different regions of the Cartesian array.
|
|
|
|
The library will both geometrically decompose into MPI tasks and across SIMD lanes.
|
|
Local vector loops are parallelised with OpenMP pragmas.
|
|
|
|
Data parallel array operations can then be specified with a SINGLE data parallel paradigm, but
|
|
optimally use MPI, OpenMP and SIMD parallelism under the hood. This is a significant simplification
|
|
for most programmers.
|
|
|
|
The layout transformations are parametrised by the SIMD vector length. This adapts according to the architecture.
|
|
Presently SSE4 (128 bit) AVX, AVX2 (256 bit) and IMCI and AVX512 (512 bit) targets are supported (ARM NEON on the way).
|
|
|
|
These are presented as
|
|
|
|
vRealF, vRealD, vComplexF, vComplexD
|
|
|
|
internal vector data types. These may be useful in themselves for other programmers.
|
|
The corresponding scalar types are named
|
|
|
|
RealF, RealD, ComplexF, ComplexD
|
|
|
|
MPI, OpenMP, and SIMD parallelism are present in the library.
|
|
|
|
You can give `configure' initial values for configuration parameters
|
|
by setting variables in the command line or in the environment. Here
|
|
are examples:
|
|
|
|
./configure CXX=clang++ CXXFLAGS="-std=c++11 -O3 -msse4" --enable-simd=SSE4
|
|
|
|
./configure CXX=clang++ CXXFLAGS="-std=c++11 -O3 -mavx" --enable-simd=AVX
|
|
|
|
./configure CXX=clang++ CXXFLAGS="-std=c++11 -O3 -mavx2" --enable-simd=AVX2
|
|
|
|
./configure CXX=icpc CXXFLAGS="-std=c++11 -O3 -mmic" --enable-simd=AVX512 --host=none
|
|
|
|
Note: Before running configure it could be necessary to execute the script
|
|
|
|
script/filelist
|
|
|
|
|
|
|
|
For developers:
|
|
Use reconfigure_script in the scripts/ directory to create the autotools environment
|
|
|