opa-basic-tools includes /usr/lib/opa/tools/stream, "STREAM: Sustainable Memory
Bandwidth in High Performance Computers". The upstream source compiles stream
with the march=native flag. However, this will result in reproducible build
failures due to differences in build machine CPUs. Thus, the Debian build of
stream omits the march=native flag and targets the default CPU architecture
detected by gcc.

Removal of march=native inhibits gcc's use of AVX and other machine-specific
optimizations. It is likely that this build of stream will have lower 
performance than when built for a specific CPU.

In order to build stream with march=native:

 1) Retrieve the opa-ff source package.
 2) Remove 0006-Remove-march-native-in-stream-build.patch from
    opa-ff/debian/patches/series.
 3) Build the opa-ff binaries: debuild -us -uc

 -- Brian T. Smith <bsmith@systemfabricworks.com> Mon, 11 Feb 2019 13:13:21 -0600
