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reduce kv cache from available memory

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Lizonghang 2024-11-28 20:21:21 +04:00
parent 9858d90ce4
commit 45a1e55eec
5 changed files with 25 additions and 7 deletions
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2
common/common.cpp
View file

@ -914,7 +914,7 @@ struct llama_init_result llama_init_from_gpt_params(gpt_params & params) {
dev_info_set = (struct device_info *)malloc(n_world * sizeof(struct device_info));
dev_info_set[0] = dev_info;
llama_gather_device_info(lctx, dev_info_set);
device_print_props(dev_info_set, n_world, model);
device_print_props(dev_info_set, n_world, model, cparams);
} else {
llama_send_device_info(lctx, &dev_info);
}

15
common/profiler.cpp
View file

@ -876,8 +876,10 @@ static float device_memory_access_delay(struct device_info & dev_info, int n_lay
#endif
}
static float device_disk_access_delay(struct device_info & dev_info, int n_layers) {
struct model_params n_params = dev_info.model_params;
static float device_disk_access_delay(struct device_info & dev_info, struct llama_model * model, const struct llama_context_params cparams) {
auto n_params = dev_info.model_params;
int n_layers = llama_model_n_layers(model);
double kv_size_gb = static_cast<double>(llama_model_kvcache_size(model, cparams)) / 1e9; // convert to GB
int64_t total_bytes = 0;
total_bytes += n_params.layer_f32 * 4 +
@ -896,12 +898,17 @@ static float device_disk_access_delay(struct device_info & dev_info, int n_layer
float total_gbytes = (double)total_bytes / 1e9; // convert to GB
float mem_avail = dev_info.memory.available_physical * 1024.0f * 1024.0f * 1024.0f / 1e9; // convert to GB
mem_avail -= static_cast<float>(kv_size_gb);
// todo: consider activations which also consumes the available memory
#ifdef __linux__
float disk_read_bw = dev_info.disk.read_seq_bw; // GB/s
#else
float disk_read_bw = dev_info.disk.read_rnd_bw; // GB/s
#endif
return std::max(0.0, static_cast<double>(total_gbytes - mem_avail) / disk_read_bw * 1000); // convert to ms
}
void device_print_props(struct device_info * dev_info_set, int n, struct llama_model * model) {
void device_print_props(struct device_info * dev_info_set, int n, struct llama_model * model, const struct llama_context_params cparams) {
LOG_INF("\n-------------------------------------------------------------------------------------------\n");
LOG_INF("| Property ");
for (int i = 0; i < n; ++i) {
@ -1255,7 +1262,7 @@ void device_print_props(struct device_info * dev_info_set, int n, struct llama_m
int n_layers = llama_model_n_layers(model);
latency += device_compute_delay(dev_info_set[0], n_layers);
latency += device_memory_access_delay(dev_info_set[0], n_layers);
latency += device_disk_access_delay(dev_info_set[0], n_layers); // if physical memory is not enough, some tensor weights will be released from memory and reloaded by mmap later
latency += device_disk_access_delay(dev_info_set[0], model, cparams); // if physical memory is not enough, some tensor weights will be released from memory and reloaded by mmap later
LOG_INF("| Token latency (ms) ");
LOG_INF("| %-10.2f ", latency);

3
common/profiler.h
View file

@ -8,6 +8,7 @@
#define DISK_TEST_SEQ_BLOCK 100L * 1024 * 1024
#define DISK_TEST_RND_BLOCK 4096
struct cpu_props {
const char * name;
const char * description;
@ -222,7 +223,7 @@ void device_disk_rnd_bw (float * read_rnd_bw, float * write_rnd_bw, int
float device_memory_bw (int n_thread);
float device_cuda_memory_bw (struct llama_model * model);
void device_get_props (struct llama_model * model, int device, struct ggml_backend_dev_props * props);
void device_print_props (struct device_info * dev_info_set, int n, struct llama_model * model);
void device_print_props (struct device_info * dev_info_set, int n, struct llama_model * model, const struct llama_context_params cparams);
int device_has_metal (void);
int device_has_cuda (void);

3
include/llama.h
View file

@ -523,6 +523,9 @@ extern "C" {
// Returns the total number of parameters in the model
LLAMA_API uint64_t llama_model_n_params(const struct llama_model * model);
// Return the size of KV cache in the model
LLAMA_API uint64_t llama_model_kvcache_size(const struct llama_model * model, const struct llama_context_params cparams);
// Return the total number of float operations in the model
LLAMA_API void llama_model_n_flops(
struct llama_model * model,

7
src/llama.cpp
View file

@ -20808,6 +20808,13 @@ static void count_n_params(struct model_params * n_params, enum ggml_type dtype,
}
}
uint64_t llama_model_kvcache_size(const struct llama_model * model, const struct llama_context_params cparams) {
const llama_hparams hparams = model->hparams;
uint64_t ne_k = static_cast<uint64_t>(hparams.n_embd_k_gqa()) * cparams.n_ctx * ggml_type_size(cparams.type_k);
uint64_t ne_v = static_cast<uint64_t>(hparams.n_embd_v_gqa()) * cparams.n_ctx * ggml_type_size(cparams.type_v);
return (ne_k + ne_v) * llama_model_n_layers(model);
}
void llama_model_n_flops(
struct llama_model * model,
struct llama_model_loader * ml,