Hi Åke,
On 07/12/2016 20:03, Åke Sandgren wrote:
Since i couldn't join todays meeting, here are some comments on the outcome.
Regarding the suggested foss/2017a, OpenMPI 2.0.1 is way better than
1.10 in my opinion. Esp since i've seen cases of 1.10.3 failing to
actually start... probably a weird corner case, but it's repeatable.
We'll be going forward with OpenMPI 2.0.2 (about to be released).
FFTW 3.3.5 (at least for this toolchain) should be compiled with
--enable-sse2 --enable-avx --enable-avx2
and preferably with --enable-avx512 too.
I'm looking into this, but even though the FFTW documentation clearly
states that an FFTW library compiled with AVX2 will run just fine on a
system without AVX2, it seems like *building* FFTW with --enable-avx2 on
a system that doesn't support AVX2 doesn't work...
Here's what I'm seeing on a Sandy Bridge systems:
configure flags:
--enable-threads --enable-openmp --with-pic --enable-single
--enable-mpi --enable-sse2 --enable-avx --enable-avx2 --enable-avx512
fails with:
In file included from ../../../dft/simd/n1f.h:21:0,
from ../common/n1fv_12.c:35,
from n1fv_12.c:3:
../../../simd-support/simd-avx2.h:43:2: error: #error "compiling
simd-avx2.h without avx2 support"
#error "compiling simd-avx2.h without avx2 support"
^~~~~
So, I don't think that including all of these --enable-avx* flags is
going to work out well, unless we implement an FFTW easyblock that
auto-detects *what* is really supported and injects the corresponding
--enable-avx* flags.
3.3.5 built that way is safe to run on anything from sse2-only and upwards.
And 6.2(3) is supposed to be able to build it that way even on sse2-only
systems.
Apparently not, but I don't think it's the problem of the GCC being
used, but of FFTW itself not allowing it...
regards,
Kenneth
On 12/07/2016 06:07 PM, Kenneth Hoste wrote:
Hi all,
Notes for today's conf call are available at
https://github.com/hpcugent/easybuild/wiki/Conference-call-notes-20161207 .
Next conf call is planned for Wed Dec 21st 2016, 5pm CET.
regards,
Kenneth
On 07/12/16 08:47, Kenneth Hoste wrote:
Dear EasyBuilders,
The next EasyBuild conference call is planned for today, Wed Dec 7th
2016, 5pm CET;
see also https://plus.google.com/events/c2n1qkbp1fhii89u647skiu5864
Agenda:
* common toolchains: foss/2017a, intel/2017a
* update on RPATH support
* https://github.com/hpcugent/easybuild-framework/issues/1992
* Q&A
Suggestions for additional topics are welcome, please let me know if
you're planning to attend this conf call.
More information about the EasyBuild conference calls is available at
https://github.com/hpcugent/easybuild/wiki/Conference-calls .
regards,
Kenneth
