Use posix_memalign version of STREAM

Taken from https://www.cs.virginia.edu/stream/FTP/Code/Versions/stream_5-10_posix_memalign.c. This version avoids statically allocated arrays by using heap allocations. This avoids limitations of ELF/PE.
alpaka-group · Feb 25, 2023 · da10cd8 · da10cd8
1 parent 1d9a110
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diff --git a/examples/stream/CMakeLists.txt b/examples/stream/CMakeLists.txt
@@ -4,7 +4,7 @@
 cmake_minimum_required (VERSION 3.18.3)
 
 find_package(OpenMP REQUIRED)
-set(STREAM_ARRAY_SIZE 80000000) # if we make this too large, we will get linker errors due to ELF/PE limits
+set(STREAM_ARRAY_SIZE 400000000 CACHE STRING "STREAM benchmark array size")
 
 project(stream C)
 

diff --git a/examples/stream/README.md b/examples/stream/README.md
@@ -0,0 +1,6 @@
+This is a compliant version of the [STREAM benchmark](https://www.cs.virginia.edu/stream/).
+There are a few official such versions, which you can download [here](https://www.cs.virginia.edu/stream/FTP/Code/).
+The [original version](https://www.cs.virginia.edu/stream/FTP/Code/stream.c) places the input and ouput arrays into the static program segment.
+This causes the linker to complain because it breaks limits of ELF/PE (Linux/Windows executable file format) for big array sizes.
+We therefore took the [version using `posix_memalign`](https://www.cs.virginia.edu/stream/FTP/Code/Versions/stream_5-10_posix_memalign.c) for allocation.
+Some fixes were applied to make it compile with MSVC.