Re: x86_64 and -mcx16
* Orion Poplawski:
I recently acquired a cheap wintel toy tablet/laptop (a Kano PC),
which has a Celeron N4000 processor.
Looking at the build logs of openmpi-4.1.0-5.fc34.x86_64, I see that
it has been compiled with the -mcx16 flag detected by configure.
However, because the instruction is not available on all x86_64
processors, the use of the flag should be disabled in OpenMPI.
This may be true, but the Celeron N4000 supports CMPXCHG16B, so it has
to be something else that causes this.
Thanks,
Florian