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[Inference/Feat] Add quant kvcache support for decode_kv_cache_memcpy (#5686)

pull/5695/head
傅剑寒 2024-05-06 15:35:13 +08:00 committed by GitHub
parent db7b3051f4
commit 1ace1065e6
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GPG Key ID: B5690EEEBB952194
1 changed files with 62 additions and 27 deletions
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89
extensions/csrc/kernel/cuda/decode_kv_cache_memcpy_kernel.cu
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@ -2,17 +2,21 @@
#include <torch/extension.h>
#include "utils/vec_copy.h"
#include "funcs/cast_functor.h"
#include "common/micros.h"
using colossalAI::cuda::utils::copy_vector;
using colossalAI::cuda::utils::get_vec_size;
using colossalAI::cuda::utils::copy;
using colossalAI::funcs::CastFunctor;
template<typename scalar_t, bool Aligned, int VecSize>
template<typename T, typename CacheT, bool Aligned, int VecSize>
__global__ void decode_kv_cache_memcpy_kernel(
const scalar_t* __restrict__ key,
const scalar_t* __restrict__ value,
scalar_t* __restrict__ key_cache,
scalar_t* __restrict__ value_cache,
const T* __restrict__ key,
const T* __restrict__ value,
CacheT* __restrict__ key_cache,
CacheT* __restrict__ value_cache,
const int* __restrict__ sequence_lengths,
const int* __restrict__ block_tables,
const int head_num,
@ -52,8 +56,8 @@ __global__ void decode_kv_cache_memcpy_kernel(
+ head_id * block_size * head_dim
+ block_offset * head_dim + head_offset;
copy_vector<scalar_t, VecSize>(key_cache + target_key_id, key + key_src_id);
copy_vector<scalar_t, VecSize>(value_cache + target_value_id, value + value_src_id);
copy<T, CacheT, VecSize>(key + key_src_id, key_cache + target_key_id);
copy<T, CacheT, VecSize>(value + value_src_id, value_cache + target_value_id);
}
if (!Aligned) {
@ -73,14 +77,14 @@ __global__ void decode_kv_cache_memcpy_kernel(
+ head_id * block_size * head_dim
+ block_offset * head_dim + head_offset;
key_cache[target_key_id] = key[key_src_id];
value_cache[target_value_id] = value[value_src_id];
key_cache[target_key_id] = CastFunctor<T, CacheT>()(key[key_src_id]);
value_cache[target_value_id] = CastFunctor<T, CacheT>()(value[value_src_id]);
}
}
}
template<typename scalar_t>
template<typename T, typename CacheT>
void apply_decode_kv_cache_memcpy(
at::Tensor& key, // [num_tokens, head_num, head_dim]
at::Tensor& value, // [num_tokens, head_num, head_dim]
@ -99,7 +103,7 @@ void apply_decode_kv_cache_memcpy(
int64_t value_stride = value.stride(0);
int block_table_stride = block_tables.stride(0);
int vec_size = get_vec_size<scalar_t>(key);
int vec_size = get_vec_size<T>(key);
bool aligned = true;
if (head_dim % vec_size != 0) {
@ -114,11 +118,11 @@ void apply_decode_kv_cache_memcpy(
#define DECODE_KV_CACHE_MEMCOPY_KERNEL_LAUNCH(__aligned, __vec_size) \
do { \
decode_kv_cache_memcpy_kernel<scalar_t, __aligned, __vec_size><<<grid, block, 0, stream>>>( \
key.data_ptr<scalar_t>(), \
value.data_ptr<scalar_t>(), \
key_cache.data_ptr<scalar_t>(), \
value_cache.data_ptr<scalar_t>(), \
decode_kv_cache_memcpy_kernel<T, CacheT, __aligned, __vec_size><<<grid, block, 0, stream>>>( \
reinterpret_cast<T*>(key.data_ptr()), \
reinterpret_cast<T*>(value.data_ptr()), \
reinterpret_cast<CacheT*>(key_cache.data_ptr()), \
reinterpret_cast<CacheT*>(value_cache.data_ptr()), \
sequence_lengths.data_ptr<int>(), \
block_tables.data_ptr<int>(), \
head_num, \
@ -168,15 +172,46 @@ void decode_kv_cache_memcpy(
at::Tensor& sequence_lengths, // [batch_size]
at::Tensor& block_tables) // [batch_size, max_seq_len]
{
DISPATCH_FLOAT_HALF_AND_BFLOAT(
key.scalar_type(),
"decode_kv_cache_memcpy",
apply_decode_kv_cache_memcpy<scalar_t>(
key,
value,
key_cache,
value_cache,
sequence_lengths,
block_tables
);)
#define _(T, CacheT) \
apply_decode_kv_cache_memcpy<T, CacheT>( \
key, \
value, \
key_cache, \
value_cache, \
sequence_lengths, \
block_tables \
)
if(key_cache.scalar_type() == at::ScalarType::Byte)
{
switch (key.scalar_type())
{
case at::ScalarType::Float:
_(float, uint8_t);
break;
case at::ScalarType::Half:
_(half, uint8_t);
break;
case at::ScalarType::BFloat16:
_(__nv_bfloat16, uint8_t);
break;
}
}
else
{
switch (key.scalar_type())
{
case at::ScalarType::Float:
_(float, float);
break;
case at::ScalarType::Half:
_(half, half);
break;
case at::ScalarType::BFloat16:
_(__nv_bfloat16, __nv_bfloat16);
break;
}
}
#undef _
}