The CUDA driver API starting version 6.5 offers a set of runtime functions to
calculate several occupancy-related measures, as a replacement for the occupancy
calculator spreadsheet.
This patch adds a heuristic for default runtime launch geometry, based on the
new runtime function cuOccupancyMaxPotentialBlockSize.
Build on x86_64 with nvptx accelerator and ran libgomp testsuite.
2018-08-13 Cesar Philippidis <cesar@codesourcery.com>
Tom de Vries <tdevries@suse.de>
PR target/85590
* plugin/cuda/cuda.h (CUoccupancyB2DSize): New typedef.
(cuOccupancyMaxPotentialBlockSize): Declare.
* plugin/cuda-lib.def (cuOccupancyMaxPotentialBlockSize): New
CUDA_ONE_CALL_MAYBE_NULL.
* plugin/plugin-nvptx.c (CUDA_VERSION < 6050): Define
CUoccupancyB2DSize and declare
cuOccupancyMaxPotentialBlockSize.
(nvptx_exec): Use cuOccupancyMaxPotentialBlockSize to set the
default num_gangs and num_workers when the driver supports it.
Co-Authored-By: Tom de Vries <tdevries@suse.de>
From-SVN: r263505
Cuda driver api functions cuLinkAddData and cuLinkCreate are available starting
version 5.5. In version 6.5, they are remapped onto _v2 versions.
The dlopen interface of the libgomp nvptx plugin uses the _v2 versions, so it
won't work with a cuda driver with driver api version lower than 6.5.
This patch fixes the problem by testing for the presence of the _v2 versions,
and falling back to the original versions in case of absence of the _v2
versions.
Build on x86_64 with nvptx accelerator and reg-tested libgomp, both with and
without --without-cuda-driver.
2018-08-08 Tom de Vries <tdevries@suse.de>
* plugin/cuda-lib.def (cuLinkAddData_v2, cuLinkCreate_v2): Declare using
CUDA_ONE_CALL_MAYBE_NULL.
* plugin/plugin-nvptx.c (cuLinkAddData, cuLinkCreate): Undef and declare.
(cuLinkAddData_v2, cuLinkCreate_v2): Declare.
(link_ptx): Fall back to cuLinkAddData/cuLinkCreate if the _v2 versions
are not found.
From-SVN: r263408
Cuda driver api function cuGetErrorString is available in version 6.0 and
higher.
Currently, when the driver that is used does not contain this function, the
libgomp nvptx plugin will not build (PLUGIN_NVPTX_DYNAMIC == 0) or run
(PLUGIN_NVPTX_DYNAMIC == 1).
This patch fixes this problem by testing for the presence of the function, and
handling absence.
Build on x86_64 with nvptx accelerator and reg-tested libgomp, both with and
without --without-cuda-driver.
2018-08-08 Tom de Vries <tdevries@suse.de>
* plugin/cuda-lib.def (cuGetErrorString): Use CUDA_ONE_CALL_MAYBE_NULL.
* plugin/plugin-nvptx.c (cuda_error): Handle if cuGetErrorString is not
present.
From-SVN: r263407
2018-08-01 Tom de Vries <tdevries@suse.de>
* plugin/cuda-lib.def: New file. Factor out of ...
* plugin/plugin-nvptx.c (CUDA_CALLS): ... here.
(struct cuda_lib_s, init_cuda_lib): Include cuda-lib.def instead of
using CUDA_CALLS.
From-SVN: r263208
Cesar Philippidis