aditya/llama.cpp
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Stream save llama context data to file instead of allocating entire buffer upfront (#2488)

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* added stream saving context data to file to avoid allocating unnecessary amounts of memory

* generalised copying state data to file or buffer

* added comments explaining how copy_state_data works

* fixed trailing whitespaces

* fixed save load state example

* updated save load state to use public function in llama.cpp

* - restored breakage of the llama_copy_state_data API
- moved new logic for copying llama state data to internal function

* fixed function declaration order

* restored save load state example

* fixed whitepace

* removed unused llama-util.h include

* Apply suggestions from code review

Co-authored-by: slaren <slarengh@gmail.com>

* Apply code review suggestions

Co-authored-by: slaren <slarengh@gmail.com>

---------

Co-authored-by: slaren <slarengh@gmail.com>
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l3utterfly 2023-08-04 19:29:52 +08:00 committed by GitHub
parent ff966e7ca6
commit 415e99fec2
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2 changed files with 86 additions and 33 deletions
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40
llama-util.h
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@ -149,6 +149,46 @@ struct llama_file {
}
};
// llama_context_data
struct llama_data_context {
virtual void write(const void * src, size_t size) = 0;
virtual size_t get_size_written() = 0;
virtual ~llama_data_context() = default;
};
struct llama_data_buffer_context : llama_data_context {
uint8_t* ptr;
size_t size_written = 0;
llama_data_buffer_context(uint8_t * p) : ptr(p) {}
void write(const void * src, size_t size) override {
memcpy(ptr, src, size);
ptr += size;
size_written += size;
}
size_t get_size_written() override {
return size_written;
}
};
struct llama_data_file_context : llama_data_context {
llama_file* file;
size_t size_written = 0;
llama_data_file_context(llama_file * f) : file(f) {}
void write(const void * src, size_t size) override {
file->write_raw(src, size);
size_written += size;
}
size_t get_size_written() override {
return size_written;
}
};
#if defined(_WIN32)
static std::string llama_format_win_err(DWORD err) {
LPSTR buf;

79
llama.cpp
View file

@ -3743,10 +3743,20 @@ size_t llama_get_state_size(const struct llama_context * ctx) {
return s_total;
}
// Copies the state to the specified destination address
size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
uint8_t * out = dst;
/** copy state data into either a buffer or file depending on the passed in context
*
* file context:
* llama_file file("/path", "wb");
* llama_data_file_context data_ctx(&file);
* llama_copy_state_data(ctx, &data_ctx);
*
* buffer context:
* std::vector<uint8_t> buf(max_size, 0);
* llama_data_buffer_context data_ctx(&buf.data());
* llama_copy_state_data(ctx, &data_ctx);
*
*/
void llama_copy_state_data_internal(struct llama_context * ctx, llama_data_context * data_ctx) {
// copy rng
{
std::stringstream rng_ss;
@ -3758,8 +3768,8 @@ size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
memset(&rng_buf[0], 0, LLAMA_MAX_RNG_STATE);
memcpy(&rng_buf[0], rng_ss.str().data(), rng_ss.str().size());
memcpy(out, &rng_size, sizeof(rng_size)); out += sizeof(rng_size);
memcpy(out, &rng_buf[0], LLAMA_MAX_RNG_STATE); out += LLAMA_MAX_RNG_STATE;
data_ctx->write(&rng_size, sizeof(rng_size));
data_ctx->write(&rng_buf[0], LLAMA_MAX_RNG_STATE);
}
// copy logits
@ -3767,25 +3777,29 @@ size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
const size_t logits_cap = ctx->logits.capacity();
const size_t logits_size = ctx->logits.size();
memcpy(out, &logits_cap, sizeof(logits_cap)); out += sizeof(logits_cap);
memcpy(out, &logits_size, sizeof(logits_size)); out += sizeof(logits_size);
data_ctx->write(&logits_cap, sizeof(logits_cap));
data_ctx->write(&logits_size, sizeof(logits_size));
if (logits_size) {
memcpy(out, ctx->logits.data(), logits_size * sizeof(float));
data_ctx->write(ctx->logits.data(), logits_size * sizeof(float));
}
out += logits_cap * sizeof(float);
// If there is a gap between the size and the capacity, write padding
size_t padding_size = (logits_cap - logits_size) * sizeof(float);
if (padding_size > 0) {
std::vector<uint8_t> padding(padding_size, 0); // Create a buffer filled with zeros
data_ctx->write(padding.data(), padding_size);
}
}
// copy embeddings
{
const size_t embedding_size = ctx->embedding.size();
memcpy(out, &embedding_size, sizeof(embedding_size)); out += sizeof(embedding_size);
data_ctx->write(&embedding_size, sizeof(embedding_size));
if (embedding_size) {
memcpy(out, ctx->embedding.data(), embedding_size * sizeof(float));
out += embedding_size * sizeof(float);
data_ctx->write(ctx->embedding.data(), embedding_size * sizeof(float));
}
}
@ -3800,8 +3814,8 @@ size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
const size_t kv_size = kv_self.buf.size;
const int kv_ntok = llama_get_kv_cache_token_count(ctx);
memcpy(out, &kv_size, sizeof(kv_size)); out += sizeof(kv_size);
memcpy(out, &kv_ntok, sizeof(kv_ntok)); out += sizeof(kv_ntok);
data_ctx->write(&kv_size, sizeof(kv_size));
data_ctx->write(&kv_ntok, sizeof(kv_ntok));
if (kv_size) {
const size_t elt_size = ggml_element_size(kv_self.k);
@ -3810,12 +3824,12 @@ size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
ggml_cgraph gf{};
ggml_tensor * kout3d = ggml_new_tensor_3d(cpy_ctx, kv_self.k->type, n_embd, kv_ntok, n_layer);
kout3d->data = out;
out += ggml_nbytes(kout3d);
std::vector<uint8_t> kout3d_data(ggml_nbytes(kout3d), 0);
kout3d->data = kout3d_data.data();
ggml_tensor * vout3d = ggml_new_tensor_3d(cpy_ctx, kv_self.v->type, kv_ntok, n_embd, n_layer);
vout3d->data = out;
out += ggml_nbytes(vout3d);
std::vector<uint8_t> vout3d_data(ggml_nbytes(vout3d), 0);
vout3d->data = vout3d_data.data();
ggml_tensor * k3d = ggml_view_3d(cpy_ctx, kv_self.k,
n_embd, kv_ntok, n_layer,
@ -3830,15 +3844,20 @@ size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
ggml_graph_compute_helper(ctx->work_buffer, &gf, /*n_threads*/ 1);
ggml_free(cpy_ctx);
// our data is now in the kout3d_data and vout3d_data buffers
// write them to file
data_ctx->write(kout3d_data.data(), kout3d_data.size());
data_ctx->write(vout3d_data.data(), vout3d_data.size());
}
}
}
const size_t written = out - dst;
const size_t max_size = llama_get_state_size(ctx);
size_t llama_copy_state_data(struct llama_context * ctx, uint8_t * dst) {
llama_data_buffer_context data_ctx(dst);
llama_copy_state_data_internal(ctx, &data_ctx);
LLAMA_ASSERT(written <= max_size);
return written;
return data_ctx.get_size_written();
}
// Sets the state reading from the specified source address
@ -4023,15 +4042,9 @@ bool llama_save_session_file(struct llama_context * ctx, const char * path_sessi
file.write_u32((uint32_t) n_token_count);
file.write_raw(tokens, sizeof(llama_token) * n_token_count);
// save the context state
{
const size_t n_state_size_max = llama_get_state_size(ctx);
std::vector<uint8_t> state_data(n_state_size_max);
const size_t n_state_size_cur = llama_copy_state_data(ctx, state_data.data());
file.write_raw(state_data.data(), n_state_size_cur);
}
// save the context state using stream saving
llama_data_file_context data_ctx(&file);
llama_copy_state_data_internal(ctx, &data_ctx);
return true;
}