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Adding Radeon support by controlling wave size #1729

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Adding Radeon support by controlling wave size #1729

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bd9f2fb
Various tweaks to enable Wave32 for Radeon cards with HIP.
seanofthemillers Aug 16, 2024
f352a5f
Removing dynamic stack allocation fix
seanofthemillers Nov 18, 2024
d0a65e7
Apply suggestions from code review
MrBurmark Nov 25, 2024
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1 change: 1 addition & 0 deletions CMakeLists.txt
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Expand Up @@ -171,6 +171,7 @@ endif()

if(RAJA_ENABLE_HIP)
message(STATUS "HIP version: ${hip_VERSION}")
set(RAJA_HIP_WAVESIZE "64" CACHE STRING "Set the wave size for GPU architecture. E.g. MI200/MI300 this is 64.")
if("${hip_VERSION}" VERSION_LESS "3.5")
message(FATAL_ERROR "Trying to use HIP/ROCm version ${hip_VERSION}. RAJA requires HIP/ROCm version 3.5 or newer. ")
endif()
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2 changes: 2 additions & 0 deletions include/RAJA/config.hpp.in
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Expand Up @@ -182,6 +182,8 @@ static_assert(RAJA_HAS_SOME_CXX14,
#cmakedefine RAJA_ENABLE_NV_TOOLS_EXT
#cmakedefine RAJA_ENABLE_ROCTX

#cmakedefine RAJA_HIP_WAVESIZE @RAJA_HIP_WAVESIZE@

/*!
******************************************************************************
*
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5 changes: 3 additions & 2 deletions include/RAJA/policy/hip/policy.hpp
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Expand Up @@ -324,8 +324,9 @@ struct DeviceConstants
// values for HIP warp size and max block size.
//
#if defined(__HIP_PLATFORM_AMD__)
constexpr DeviceConstants device_constants(64, 1024, 64); // MI300A
// constexpr DeviceConstants device_constants(64, 1024, 128); // MI250X
constexpr DeviceConstants device_constants(RAJA_HIP_WAVESIZE, 1024, 64); // MI300A
// constexpr DeviceConstants device_constants(RAJA_HIP_WAVESIZE, 1024, 128); // MI250X

#elif defined(__HIP_PLATFORM_NVIDIA__)
constexpr DeviceConstants device_constants(32, 1024, 32); // V100
#endif
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9 changes: 5 additions & 4 deletions include/RAJA/policy/tensor/arch/hip/hip_wave.hpp
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Expand Up @@ -57,7 +57,7 @@ namespace expt

public:

static constexpr int s_num_elem = 64;
static constexpr int s_num_elem = policy::hip::device_constants.WARP_SIZE;

/*!
* @brief Default constructor, zeros register contents
Expand Down Expand Up @@ -780,8 +780,8 @@ namespace expt

// Third: mask off everything but output_segment
// this is because all output segments are valid at this point
// (5-segbits), the 5 is since the warp-width is 32 == 1<<5
int our_output_segment = get_lane()>>(6-segbits);
static constexpr int log2_warp_size = RAJA::log2(RAJA::policy::hip::device_constants.WARP_SIZE);
int our_output_segment = get_lane()>>(log2_warp_size-segbits);
bool in_output_segment = our_output_segment == output_segment;
if(!in_output_segment){
result.get_raw_value() = 0;
Expand Down Expand Up @@ -828,8 +828,9 @@ namespace expt

// First: tree reduce values within each segment
element_type x = m_value;
static constexpr int log2_warp_size = RAJA::log2(RAJA::policy::hip::device_constants.WARP_SIZE);
RAJA_UNROLL
for(int i = 0;i < 6-segbits; ++ i){
for(int i = 0;i < log2_warp_size-segbits; ++ i){

// tree shuffle
int delta = s_num_elem >> (i+1);
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3 changes: 2 additions & 1 deletion include/RAJA/policy/tensor/arch/hip/traits.hpp
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Expand Up @@ -29,7 +29,8 @@ namespace expt {
struct RegisterTraits<RAJA::expt::hip_wave_register, T>{
using element_type = T;
using register_policy = RAJA::expt::hip_wave_register;
static constexpr camp::idx_t s_num_elem = 64;
static constexpr camp::idx_t s_num_elem = policy::hip::device_constants.WARP_SIZE;

static constexpr camp::idx_t s_num_bits = sizeof(T) * s_num_elem;
using int_element_type = int32_t;
};
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4 changes: 3 additions & 1 deletion test/include/RAJA_test-tensor.hpp
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Expand Up @@ -87,7 +87,9 @@ struct TensorTestHelper<RAJA::expt::hip_wave_register>
void exec(BODY const &body){
hipDeviceSynchronize();

RAJA::forall<RAJA::hip_exec<64>>(RAJA::RangeSegment(0,64),
static constexpr int warp_size = RAJA::policy::hip::device_constants.WARP_SIZE;

RAJA::forall<RAJA::hip_exec<warp_size>>(RAJA::RangeSegment(0,warp_size),
[=] RAJA_HOST_DEVICE (int ){
body();
});
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