On 11/2/22 13:03, Florian Weimer wrote:
* Demi Marie Obenour:
On 11/2/22 02:56, Florian Weimer wrote:
* Benson Muite:
On 11/1/22 06:35, Orion Poplawski wrote:
While poking at building openmpi with clang, I started wondering
about flang and some things:
* Should %set_build_flags set FC? I think it should since it sets
FCFLAGS.
* Is flang-new even worth bothering with? See the following
configure check:
Yes, this will be helpful. Significant work has gone into optimizing
this for A64FX
Fedora does not run well on A64FX because we enable PAC+BTI, adding
significant overhead to most function calls.
How is this specific to A64FX?
It just is? I'm not aware of any other AArch64 CPUs that are impacted
in the same way.
It is not specific to A64-FX, but flang has been optimized for aarch64
as a result of this. Thus, use of flang likely to grow in use for
applications that use MPI. My expectation is that Fedora is mostly used
for testing MPI applications, though with increasing core counts,
production use on workstations will likely grow.
Maybe I don't understand the question.
Thanks,
Florian
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