mirror of
https://github.com/paboyle/Grid.git
synced 2025-10-25 18:19:34 +01:00
45 lines
2.0 KiB
Plaintext
45 lines
2.0 KiB
Plaintext
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 (eventually) both geometrically decompose into MPI tasks and across SIMD lanes.
|
|
|
|
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 SSE2 (128 bit) AVX, AVX2 (256 bit) and IMCI and AVX512 (512 bit) targets are supported.
|
|
|
|
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 parallelism is UNIMPLEMENTED and for now only OpenMP and SIMD parallelism is 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
|
|
is 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=AVX1
|
|
|
|
./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
|
|
|
|
|