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//------------------------------------------------------------------------------
// GraphBLAS/CUDA/GB_cuda_init: initialize the GPUs for use by GraphBLAS
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// This file: Copyright (c) 2024-2025, NVIDIA CORPORATION. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// GB_cuda_init queries the system for the # of GPUs available, their memory
// sizes, SM counts, and other capabilities. Unified Memory support is
// assumed. Then each GPU is "warmed up" by allocating a small amount of
// memory.
// FIXME: remove printfs
#include "GB.h"
GrB_Info GB_cuda_init (void)
{
// get the GPU properties
if (!GB_Global_gpu_count_set (true))
{
printf ("GB_cuda_init line %d\n", __LINE__) ;
return (GxB_GPU_ERROR) ;
}
int gpu_count = GB_Global_gpu_count_get ( ) ;
printf ("GB_cuda_init: ngpus: %d\n", gpu_count) ;
for (int device = 0 ; device < gpu_count ; device++)
{
// query the GPU and then warm it up
if (!GB_Global_gpu_device_properties_get (device))
{
printf ("GB_cuda_init line %d\n", __LINE__) ;
return (GxB_GPU_ERROR) ;
}
}
// initialize RMM if necessary
if (!rmm_wrap_is_initialized ())
{
rmm_wrap_initialize_all_same (rmm_wrap_managed,
// FIXME ask the GPU(s) for good default values. This might be
// found by GB_cuda_init. Perhaps GB_cuda_init needs to be split
// into 2 methods: one to query the sizes(s) of the GPU(s) then
// call rmm_wrap_initialize_all_same, and the other for the rest
// of the work. Alternatively, move GB_cuda_init here (if so,
// ensure that it doesn't depend on any other initializations
// below).
256 * 1000000L, 1024 * 100000000L, 1) ; // FIXME: ask the GPU(s)
}
// warm up the GPUs
for (int device = 0 ; device < gpu_count ; device++)
{
if (!GB_cuda_warmup (device))
{
printf ("GB_cuda_init line %d\n", __LINE__) ;
return (GxB_GPU_ERROR) ;
}
}
// FIXME: default device set to 1 to avoid hardware failure ...
GB_cuda_set_device (0) ; // make GPU 1 the default device
GB_Context_gpu_id_set (NULL, 0) ; // set GxB_CONTEXT_WORLD->gpu_id to 1
// also check for jit cache, pre-load library of common kernels ...
return (GrB_SUCCESS) ;
}
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