-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello all,
> ET release: * most tests pass on all machines, exceptions are > GRHydro's weno and slow_sector tests. Roland will look into them > (since he put them into the repo). Suspicions are that they were > generated using gcc but are now tested using intel (thing > --fast-math) I looked into this and so far it is not clear to me where the differences come from. The points that differ are in the outer boundary in the "---" corner of the domain. (in 2D) They form a square of size of the ghost zones. This is idependent of using -O2 or -O0. Also compiling the WENO routines with gfortran (and everything else with ifort) makes no difference. I also looked into the issue that many tests fail on bethe when oversubscribing the machine using 2 MPI processes and 8 threads each (there are only 8 physical cores). This turns out to be related to vectorization/OpenMP in the Kranc generated thorns, in particular McLachlan. The errors go away if I either run without openmp, or fewer openmp threads, eg. 1x16 fails but 1x8 is fine. They also go away if I disable vectorization. Changing various Vectors options for ALIGNED storage and read/write seems to make no difference. This actually seems serious if really there is a bug in the interaction between vectorization and OpenMP (note that since the error goes away and comes back if I disable OpenMP only in eg. the ML_BSSN_enforce.cc file it does not seem to be related to reductions being not bit identical when using OpenMP.). Yours, Roland - -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlGOlpAACgkQTiFSTN7SboU4KgCdGarZ+QERdh2wYNFS+Hn+CFRQ dNMAoIWStwoFmegaj+1WmlVu3Ql/eG6a =ci8n -----END PGP SIGNATURE----- _______________________________________________ Users mailing list [email protected] http://lists.einsteintoolkit.org/mailman/listinfo/users
