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Added Eigen -march=native hack to perf docs.

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Details:
- Spell out the hack given to me by Sameer Agarwal in order to get Eigen
  to build with -march=native (which is critically important for Eigen)
  in docs/Performance.md and docs/PerformanceSmall.md.
This commit is contained in:
Field G. Van Zee
2019-08-22 14:27:30 -05:00
parent 0cd383d53a
commit 2f387e32ef
2 changed files with 40 additions and 5 deletions
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27
docs/Performance.md
View File

@@ -208,7 +208,14 @@ size of interest so that we can better assist you.
* Multithreaded (52 core) execution requested via `export OPENBLAS_NUM_THREADS=52`
* Eigen 3.3.90
* Obtained via the [Eigen git mirror](https://github.com/eigenteam/eigen-git-mirror) (March 27, 2019)
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal).
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal):
```
# These lines added after line 67.
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endif()
```
* configured and built BLAS library via `mkdir build; cd build; cmake ..; make blas`
* The `gemm` implementation was pulled in at compile-time via Eigen headers; other operations were linked to Eigen's BLAS library.
* Single-threaded (1 core) execution requested via `export OMP_NUM_THREADS=1`
@@ -282,7 +289,14 @@ size of interest so that we can better assist you.
* Multithreaded (24 core) execution requested via `export OPENBLAS_NUM_THREADS=24`
* Eigen 3.3.90
* Obtained via the [Eigen git mirror](https://github.com/eigenteam/eigen-git-mirror) (March 27, 2019)
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal).
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal):
```
# These lines added after line 67.
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endif()
```
* configured and built BLAS library via `mkdir build; cd build; cmake ..; make blas`
* The `gemm` implementation was pulled in at compile-time via Eigen headers; other operations were linked to Eigen's BLAS library.
* Single-threaded (1 core) execution requested via `export OMP_NUM_THREADS=1`
@@ -354,7 +368,14 @@ size of interest so that we can better assist you.
* Multithreaded (64 core) execution requested via `export OPENBLAS_NUM_THREADS=64`
* Eigen 3.3.90
* Obtained via the [Eigen git mirror](https://github.com/eigenteam/eigen-git-mirror) (March 27, 2019)
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal).
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal):
```
# These lines added after line 67.
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endif()
```
* configured and built BLAS library via `mkdir build; cd build; cmake ..; make blas`
* The `gemm` implementation was pulled in at compile-time via Eigen headers; other operations were linked to Eigen's BLAS library.
* Single-threaded (1 core) execution requested via `export OMP_NUM_THREADS=1`

18
docs/PerformanceSmall.md
View File

@@ -125,7 +125,14 @@ size of interest so that we can better assist you.
* configured `Makefile.rule` with: `BLAS_API=1 FORTRAN_BLAS_API=1 CBLAS_API=1`.
* Eigen 3.3.90
* Obtained via the [Eigen git mirror](https://github.com/eigenteam/eigen-git-mirror) (30 May 2019)
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal).
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal):
```
# These lines added after line 67.
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endif()
```
* configured and built BLAS library via `mkdir build; cd build; cmake ..; make blas`
* The `gemm` implementation was pulled in at compile-time via Eigen headers; other operations were linked to Eigen's BLAS library.
* Requested threading via `export OMP_NUM_THREADS=1` (single-threaded)
@@ -187,7 +194,14 @@ size of interest so that we can better assist you.
* configured `Makefile.rule` with: `BLAS_API=1 FORTRAN_BLAS_API=1 CBLAS_API=1`.
* Eigen 3.3.90
* Obtained via the [Eigen git mirror](https://github.com/eigenteam/eigen-git-mirror) (30 May 2019)
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal).
* Prior to compilation, modified top-level `CMakeLists.txt` to ensure that `-march=native` was added to `CXX_FLAGS` variable (h/t Sameer Agarwal):
```
# These lines added after line 67.
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endif()
```
* configured and built BLAS library via `mkdir build; cd build; cmake ..; make blas`
* The `gemm` implementation was pulled in at compile-time via Eigen headers; other operations were linked to Eigen's BLAS library.
* Requested threading via `export OMP_NUM_THREADS=1` (single-threaded)