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@ -158,7 +158,6 @@ The following options can be use with the `--enable-comms=` option to target dif
| `none` | no communications |
| `mpi[-auto]` | MPI communications |
| `mpi3[-auto]` | MPI communications using MPI 3 shared memory |
| `mpi3l[-auto]` | MPI communications using MPI 3 shared memory and leader model |
| `shmem ` | Cray SHMEM communications |
For the MPI interfaces the optional `-auto` suffix instructs the `configure` scripts to determine all the necessary compilation and linking flags. This is done by extracting the informations from the MPI wrapper specified in the environment variable `MPICXX` (if not specified `configure` will scan though a list of default names). The `-auto` suffix is not supported by the Cray environment wrapper scripts. Use the standard versions instead.
@ -199,21 +198,109 @@ The following configuration is recommended for the Intel Knights Landing platfor
``` bash
../configure --enable-precision=double\
--enable-simd=KNL \
--enable-comms=mpi-auto \
--with-gmp=<path> \
--with-mpfr=<path> \
--enable-comms=mpi-auto \
--enable-mkl \
CXX=icpc MPICXX=mpiicpc
```
The MKL flag enables use of BLAS and FFTW from the Intel Math Kernels Library.
where `<path>` is the UNIX prefix where GMP and MPFR are installed. If you are working on a Cray machine that does not use the `mpiicpc` wrapper, please use:
If you are working on a Cray machine that does not use the `mpiicpc` wrapper, please use:
``` bash
../configure --enable-precision=double\
--enable-simd=KNL \
--enable-comms=mpi \
--with-gmp=<path> \
--with-mpfr=<path> \
--enable-mkl \
CXX=CC CC=cc
```
If gmp and mpfr are NOT in standard places (/usr/) these flags may be needed:
``` --with-gmp=<path> \
--with-mpfr=<path> \
```
where `<path>` is the UNIX prefix where GMP and MPFR are installed.
Knight's Landing with Intel Omnipath adapters with two adapters per node
presently performs better with use of more than one rank per node, using shared memory
for interior communication. This is the mpi3 communications implementation.
We recommend four ranks per node for best performance, but optimum is local volume dependent.
``` bash
../configure --enable-precision=double\
--enable-simd=KNL \
--enable-comms=mpi3 \
--enable-mkl \
CXX=mpiicpc
```
### Build setup for Intel Haswell Xeon platform
The following configuration is recommended for the Intel Knights Landing platform:
``` bash
../configure --enable-precision=double\
--enable-simd=AVX2 \
--enable-comms=mpi3 \
--enable-mkl \
CXX=mpiicpc
```
The MKL flag enables use of BLAS and FFTW from the Intel Math Kernels Library.
If gmp and mpfr are NOT in standard places (/usr/) these flags may be needed:
``` --with-gmp=<path> \
--with-mpfr=<path> \
```
where `<path>` is the UNIX prefix where GMP and MPFR are installed.
If you are working on a Cray machine that does not use the `mpiicpc` wrapper, please use:
``` bash
../configure --enable-precision=double\
--enable-simd=AVX2 \
--enable-comms=mpi3 \
--enable-mkl \
CXX=CC CC=cc
```
Since Dual socket nodes are commonplace, we recommend MPI-3 as the default with the use of
one rank per socket. If using the Intel MPI library, threads should be pinned to NUMA domains using
```
export I_MPI_PIN=1
```
This is the default.
### Build setup for Intel Skylake Xeon platform
The following configuration is recommended for the Intel Knights Landing platform:
``` bash
../configure --enable-precision=double\
--enable-simd=AVX512 \
--enable-comms=mpi3 \
--enable-mkl \
CXX=mpiicpc
```
The MKL flag enables use of BLAS and FFTW from the Intel Math Kernels Library.
If gmp and mpfr are NOT in standard places (/usr/) these flags may be needed:
``` --with-gmp=<path> \
--with-mpfr=<path> \
```
where `<path>` is the UNIX prefix where GMP and MPFR are installed.
If you are working on a Cray machine that does not use the `mpiicpc` wrapper, please use:
``` bash
../configure --enable-precision=double\
--enable-simd=AVX512 \
--enable-comms=mpi3 \
--enable-mkl \
CXX=CC CC=cc
```
Since Dual socket nodes are commonplace, we recommend MPI-3 as the default with the use of
one rank per socket. If using the Intel MPI library, threads should be pinned to NUMA domains using
```
export I_MPI_PIN=1
```
This is the default.