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ggml : add is_ram_shared to ggml_backend

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Metal can share the RAM memory and can utilize mmap without temp buffer
This commit is contained in:
Georgi Gerganov
2023-07-18 18:51:02 +03:00
parent 90503f150d
commit 652c849643
4 changed files with 68 additions and 21 deletions
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5
ggml-backend.c
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@@ -255,8 +255,9 @@ struct ggml_backend ggml_backend_cpu_init(void) {
ctx->work_size = 0;
struct ggml_backend cpu_backend = {
/* .interface = */ &cpu_backend_interface,
/* .context = */ ctx
/* .interface = */ &cpu_backend_interface,
/* .context = */ ctx,
/* .is_ram_shared = */ true,
};
return cpu_backend;
}

14
ggml-backend.h
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@@ -61,7 +61,10 @@ extern "C" {
struct ggml_backend {
struct ggml_backend_interface * interface;
ggml_backend_context_t context;
bool is_ram_shared;
};
// backend helper functions
@@ -78,7 +81,16 @@ extern "C" {
static inline void ggml_backend_graph_compute(struct ggml_backend * backend, struct ggml_cgraph * cgraph) { backend->interface->graph_compute(backend->context, cgraph); }
// buffer and tensor allocation
GGML_API struct ggml_buffer ggml_backend_alloc_buffer(struct ggml_backend * backend, size_t size, size_t max_tensors); // GG: probably return ptr
// TODO:
// - return "struct ggml_buffer *"
// - fix namings:
// - ggml_backend_alloc_buffer -> ggml_backend_buffer_alloc
// - ggml_backend_free_buffer -> ggml_backend_buffer_free
// - ggml_backend_reset_buffer -> ggml_backend_buffer_reset
// - ggml_backend_alloc_tensor -> ggml_backend_tensor_alloc
// - ggml_backend_tensor_cpy -> ggml_backend_tensor_copy
//
GGML_API struct ggml_buffer ggml_backend_alloc_buffer(struct ggml_backend * backend, size_t size, size_t max_tensors);
GGML_API void ggml_backend_free_buffer(struct ggml_buffer * buffer);
static inline void ggml_backend_reset_buffer(struct ggml_buffer * buffer) { buffer->backend->interface->reset_buffer(buffer->backend->context, buffer->backend_buffer); }
static inline void ggml_backend_alloc_tensor(struct ggml_buffer * buffer, struct ggml_tensor * tensor) { buffer->backend->interface->alloc_tensor(buffer->backend->context, buffer->backend_buffer, tensor); }

5
ggml-cuda.cu
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@@ -1834,8 +1834,9 @@ ggml_backend ggml_backend_cuda_init(void) {
ggml_backend_cuda_context * ctx = new ggml_backend_cuda_context;
ggml_backend cuda_backend = {
/* .interface = */ &cuda_backend_interface,
/* .context = */ ctx
/* .interface = = */ &cuda_backend_interface,
/* .context = */ ctx,
/* .is_ram_shared = */ false,
};
return cuda_backend;
}

65
llama.cpp
View File

@@ -225,6 +225,7 @@ struct llama_model {
llama_vocab vocab;
// backends
// TODO: change to pointers
ggml_backend backend_cpu;
ggml_buffer buf_cpu;
ggml_context * ctx_cpu = NULL;
@@ -298,6 +299,7 @@ struct llama_context {
// memory buffers used to evaluate the model
ggml_buffer buf_compute_cpu = {};
#ifdef GGML_USE_CUDA
ggml_buffer buf_compute_cuda = {};
#endif
@@ -612,7 +614,7 @@ struct llama_model_loader {
}
}
void load_all_data(llama_progress_callback progress_callback, void * progress_callback_user_data, llama_mlock * lmlock) {
void load_all_data(llama_progress_callback progress_callback, void * progress_callback_user_data, llama_mlock * lmlock) {
size_t data_size = 0;
size_t lock_size = 0;
for (const llama_load_tensor & lt : tensors_map.tensors) {
@@ -634,11 +636,11 @@ struct llama_model_loader {
}
LLAMA_ASSERT(lt.ggml_tensor); // unused tensors should have been caught by load_data already
bool is_cpu = lt.ggml_tensor->backend == &model->backend_cpu;
const bool is_ram_shared = lt.ggml_tensor->backend->is_ram_shared;
// select buffer to load data into
if (!use_mmap) {
if (is_cpu) {
if (is_ram_shared) {
lt.data = (uint8_t *) lt.ggml_tensor->data;
} else {
// read to temporary buffer
@@ -649,7 +651,7 @@ struct llama_model_loader {
load_data_for(lt);
if (is_cpu) {
if (is_ram_shared) {
if (use_mmap) {
lt.ggml_tensor->data = lt.data;
// TODO: this assumes that the data to lock is contiguous, which may not always be the case
@@ -671,7 +673,7 @@ struct llama_model_loader {
}
}
void load_data_for(llama_load_tensor & lt) {
void load_data_for(llama_load_tensor & lt) const {
if (use_mmap) {
lt.data = (uint8_t *) mapping->addr + lt.file_off;
} else {
@@ -957,6 +959,7 @@ static void llama_model_load_internal(
ggml_backend * backend_cpu = &model.backend_cpu;
ggml_backend * backend_gpu = &model.backend_cpu; // hack until we have a proper backend selection
#ifdef GGML_USE_CUDA
if (n_gpu_layers > 0) {
model.backend_cuda = ggml_backend_cuda_init();
@@ -965,13 +968,14 @@ static void llama_model_load_internal(
#endif
#ifdef GGML_USE_METAL
if (n_gpu_layers > 0) {
model.backend_metal = ggml_backend_cpu_init();
model.backend_metal = ggml_backend_metal_init();
backend_gpu = &model.backend_metal;
}
#endif
// assign splits to the backends
const int i_gpu_start = std::max(0, (int)n_layer - n_gpu_layers);
model.backend_inp = n_gpu_layers > (int)n_layer ? backend_gpu : backend_cpu;
model.backend_out = n_gpu_layers > 0 ? backend_gpu : backend_cpu;
@@ -1011,7 +1015,7 @@ static void llama_model_load_internal(
fprintf(stderr, "%s: ggml ctx sizes:\n", __func__);
for (const auto & it : ctx_sizes) {
fprintf(stderr, "%8s = %7.2f MB", ggml_backend_name(it.first), it.second / 1024.0 / 1024.0);
if (it.first == backend_cpu && ml->use_mmap) {
if (it.first->is_ram_shared && ml->use_mmap) {
fprintf(stderr, " + %7.2f MB (mmap)", mmap_size / 1024.0 / 1024.0);
}
fprintf(stderr, "\n");
@@ -1135,12 +1139,10 @@ static void llama_model_load_internal(
ctx_sum += it.second;
}
const size_t mem_required =
ctx_sum + MEM_REQ_EVAL().at(model.type);
const size_t mem_required = ctx_sum + MEM_REQ_EVAL().at(model.type);
// this is the memory required by one llama_state
const size_t mem_required_state =
scale*MEM_REQ_KV_SELF().at(model.type);
const size_t mem_required_state = scale*MEM_REQ_KV_SELF().at(model.type);
fprintf(stderr, "%s: mem required = %7.2f MB (+ %7.2f MB per state)\n", __func__,
mem_required / 1024.0 / 1024.0, mem_required_state / 1024.0 / 1024.0);
@@ -1162,6 +1164,7 @@ static void llama_model_load_internal(
// loading time will be recalculate after the first eval, so
// we take page faults deferred by mmap() into consideration
model.t_load_us = ggml_time_us() - model.t_start_us;
}
static bool llama_model_load(
@@ -1226,6 +1229,7 @@ static ggml_graph_splits llama_build_graph(
// initialize contexts for every backend
struct ggml_context * ctx_cpu = nullptr;
if (lctx.buf_compute_cpu.mem_size > 0) {
struct ggml_init_params params = ggml_init_params_default();
params.buffer = &lctx.buf_compute_cpu;
@@ -1235,6 +1239,7 @@ static ggml_graph_splits llama_build_graph(
#ifdef GGML_USE_CUDA
struct ggml_context * ctx_cuda = nullptr;
if (lctx.buf_compute_cuda.mem_size > 0) {
struct ggml_init_params params = ggml_init_params_default();
params.buffer = &lctx.buf_compute_cuda;
@@ -1243,30 +1248,54 @@ static ggml_graph_splits llama_build_graph(
}
#endif
#ifdef GGML_USE_METAL
struct ggml_context * ctx_metal = nullptr;
if (lctx.buf_compute_metal.mem_size > 0) {
struct ggml_init_params params = ggml_init_params_default();
params.buffer = &lctx.buf_compute_metal;
params.compute_type = compute_type;
ctx_metal = ggml_init(params);
}
#endif
// TODO: clean this
struct ggml_context * ctx_i = nullptr;
struct ggml_context * ctx_ls[80] = {nullptr};
struct ggml_context * ctx_o = nullptr;
struct ggml_context * ctx_kv = nullptr;
struct ggml_context * ctx_ls[80] = {nullptr};
if (lctx.model.backend_inp == &lctx.model.backend_cpu) ctx_i = ctx_cpu;
if (lctx.model.backend_out == &lctx.model.backend_cpu) ctx_o = ctx_cpu;
#ifdef GGML_USE_CUDA
if (lctx.model.backend_inp == &lctx.model.backend_cuda) ctx_i = ctx_cuda;
if (lctx.model.backend_out == &lctx.model.backend_cuda) ctx_o = ctx_cuda;
#endif
#ifdef GGML_USE_METAL
if (lctx.model.backend_inp == &lctx.model.backend_metal) ctx_i = ctx_metal;
if (lctx.model.backend_out == &lctx.model.backend_metal) ctx_o = ctx_metal;
#endif
for (int il = 0; il < n_layer; il++) {
if (lctx.model.backend_layers[il] == &lctx.model.backend_cpu) ctx_ls[il] = ctx_cpu;
if (lctx.model.backend_layers[il] == &lctx.model.backend_cpu) ctx_ls[il] = ctx_cpu;
#ifdef GGML_USE_CUDA
if (lctx.model.backend_layers[il] == &lctx.model.backend_cuda) ctx_ls[il] = ctx_cuda;
#endif
#ifdef GGML_USE_METAL
if (lctx.model.backend_layers[il] == &lctx.model.backend_metal) ctx_ls[il] = ctx_metal;
#endif
}
if (lctx.backend_kv == &lctx.model.backend_cpu) ctx_kv = ctx_cpu;
if (lctx.backend_kv == &lctx.model.backend_cpu) ctx_kv = ctx_cpu;
#ifdef GGML_USE_CUDA
if (lctx.backend_kv == &lctx.model.backend_cuda) ctx_kv = ctx_cuda;
#endif
#ifdef GGML_USE_METAL
if (lctx.backend_kv == &lctx.model.backend_metal) ctx_kv = ctx_metal;
#endif
struct ggml_tensor * inpL;
@@ -1522,7 +1551,7 @@ static ggml_graph_splits llama_build_graph(
//}
#ifdef LLAMA_1L_GRAPH_DUMP
if (N==1 && n_past == 0) {
if (N == 1 && n_past == 0) {
ggml_graph_dump_dot(gf, NULL, "llama.dot");
printf("graph for N=%i, n_past=%i dumped to llama.dot\n", N, n_past);
exit(0);
@@ -1547,6 +1576,11 @@ static ggml_graph_splits llama_build_graph(
ggml_free(ctx_cuda);
}
#endif
#ifdef GGML_USE_METAL
if (ctx_metal != nullptr) {
ggml_free(ctx_metal);
}
#endif
return splits;
}
@@ -2651,7 +2685,6 @@ struct llama_context * llama_new_context_with_model(
ctx->rng = std::mt19937(params.seed);
ctx->logits_all = params.logits_all;
// TODO: choose backend depending on n_layers/low_vram
#ifdef GGML_USE_CUDA
if ((uint32_t)params.n_gpu_layers >= model->hparams.n_layer/2) {