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rename Kokkos::gpu_direct to Kokkos::gpu_direct_flag

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This is for consistency with other parts of LAMMPS where
such variables have "flag" in their name. Also reduces
confusion with have_gpu_direct() function.

When we can safely detect, that GPU-direct is not available,
change the default setting of Kokkos::gpu_direct_flag from 1 to 0
This commit is contained in:
Axel Kohlmeyer
2018-08-09 04:46:31 -04:00
parent dd9fed11dc
commit 9521814441
5 changed files with 27 additions and 19 deletions
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11
doc/src/package.txt
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@ -512,9 +512,12 @@ this keyword is set to {on}, buffers in GPU memory are passed directly
through MPI send/receive calls. This reduces overhead of first copying
the data to the host CPU. However GPU-direct is not supported on all
systems, which can lead to segmentation faults and would require
using a value of {off}. When the {gpu/direct} keyword is set to {off}
while any of the {comm} keywords are set to {device}, the value for the
{comm} keywords will be automatically changed to {host}.
using a value of {off}. If LAMMPS can safely detect that GPU-direct is
not available (currently only possible with OpenMPI v2.0.0 or later),
then the {gpu/direct} keyword is automatically set to {off} by default.
When the {gpu/direct} keyword is set to {off} while any of the {comm}
keywords are set to {device}, the value for these {comm} keywords will
be automatically changed to {host}.
:line
@ -624,6 +627,8 @@ switch"_Section_start.html#start_6.
For the KOKKOS package, the option defaults neigh = full, neigh/qeq =
full, newton = off, binsize = 0.0, and comm = device, gpu/direct = on.
When LAMMPS can safely detect, that GPU-direct is not available, the
default value of gpu/direct becomes "off".
These settings are made automatically by the required "-k on"
"command-line switch"_Section_start.html#start_6. You can change them by
using the package kokkos command in your input script or via the "-pk