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ggml : alloc ggml_contexts on the heap (#2525)

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* whisper : reduce ggml_context usage

* ggml : allocate contexts on the heap (v2)

* ggml : aligned malloc -> malloc
This commit is contained in:
Georgi Gerganov
2024-10-31 22:00:09 +02:00
committed by GitHub
parent 19dca2bb14
commit aa037a60f3
4 changed files with 39 additions and 69 deletions
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28
src/whisper.cpp
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@ -699,9 +699,9 @@ struct whisper_kv_cache {
struct ggml_tensor * k;
struct ggml_tensor * v;
struct ggml_context * ctx = nullptr;
ggml_backend_buffer_t buffer = nullptr;
std::vector<uint8_t> ctx_buf;
};
struct whisper_model {
@ -941,9 +941,11 @@ static bool whisper_kv_cache_init(
const int64_t n_mem = n_text_layer*n_ctx;
const int64_t n_elements = n_text_state*n_mem;
cache.ctx_buf.resize(2*ggml_tensor_overhead());
struct ggml_init_params params = {
/*.mem_size =*/ 2*ggml_tensor_overhead(),
/*.mem_buffer =*/ nullptr,
/*.mem_size =*/ cache.ctx_buf.size(),
/*.mem_buffer =*/ cache.ctx_buf.data(),
/*.no_alloc =*/ true,
};
@ -953,17 +955,17 @@ static bool whisper_kv_cache_init(
cache.cells.clear();
cache.cells.resize(n_ctx);
cache.ctx = ggml_init(params);
struct ggml_context * ctx = ggml_init(params);
if (!cache.ctx) {
if (!ctx) {
WHISPER_LOG_ERROR("%s: failed to allocate memory for the kv cache context\n", __func__);
return false;
}
cache.k = ggml_new_tensor_1d(cache.ctx, wtype, n_elements);
cache.v = ggml_new_tensor_1d(cache.ctx, wtype, n_elements);
cache.k = ggml_new_tensor_1d(ctx, wtype, n_elements);
cache.v = ggml_new_tensor_1d(ctx, wtype, n_elements);
cache.buffer = ggml_backend_alloc_ctx_tensors(cache.ctx, backend);
cache.buffer = ggml_backend_alloc_ctx_tensors(ctx, backend);
if (!cache.buffer) {
WHISPER_LOG_ERROR("%s: failed to allocate memory for the kv cache\n", __func__);
return false;
@ -971,13 +973,13 @@ static bool whisper_kv_cache_init(
ggml_backend_buffer_clear(cache.buffer, 0);
ggml_free(ctx);
return true;
}
static void whisper_kv_cache_free(struct whisper_kv_cache & cache) {
ggml_free(cache.ctx);
ggml_backend_buffer_free(cache.buffer);
cache.ctx = nullptr;
}
static bool whisper_kv_cache_find_slot(
@ -2002,7 +2004,7 @@ static struct ggml_cgraph * whisper_build_graph_encoder(
auto & kv_pad = wstate.kv_pad;
WHISPER_ASSERT(!!kv_pad.ctx);
WHISPER_ASSERT(!!kv_pad.buffer);
const int n_ctx_pad = GGML_PAD(n_ctx, 256);
@ -2416,7 +2418,7 @@ static struct ggml_cgraph * whisper_build_graph_decoder(
auto & kv_self = wstate.kv_self;
WHISPER_ASSERT(!!kv_self.ctx);
WHISPER_ASSERT(!!kv_self.buffer);
const int n_ctx = kv_self.size;
const int n_state = hparams.n_text_state;