diff --git a/common/common.cpp b/common/common.cpp index eec704b99f888..636ed35627f4a 100644 --- a/common/common.cpp +++ b/common/common.cpp @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -1386,3 +1387,77 @@ void dump_non_result_info_yaml(FILE * stream, const gpt_params & params, const l fprintf(stream, "typical_p: %f # default: 1.0\n", sparams.typical_p); fprintf(stream, "verbose_prompt: %s # default: false\n", params.verbose_prompt ? "true" : "false"); } + +// +// KV cache utils +// + +void dump_kv_cache_view(const llama_kv_cache_view & view, int row_size) { + static const char slot_chars[] = ".123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+"; + + printf("=== Dumping KV cache. total cells %d, max sequences per cell %d, populated cells %d, total tokens in cache %d, largest empty slot=%d @ %d", + view.n_cells, view.n_max_seq, view.used_cells, view.token_count, view.max_contiguous, view.max_contiguous_idx); + + llama_kv_cache_view_cell * c_curr = view.cells; + llama_seq_id * cs_curr = view.cells_sequences; + + for (int i = 0; i < view.n_cells; i++, c_curr++, cs_curr += view.n_max_seq) { + if (i % row_size == 0) { + printf("\n%5d: ", i); + } + int seq_count = 0; + for (int j = 0; j < view.n_max_seq; j++) { + if (cs_curr[j] >= 0) { seq_count++; } + } + putchar(slot_chars[std::min(sizeof(slot_chars) - 2, size_t(seq_count))]); + } + + printf("\n=== Done dumping\n"); +} + +void dump_kv_cache_view_seqs(const llama_kv_cache_view & view, int row_size) { + static const char slot_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + + printf("=== Dumping KV cache. total cells %d, max sequences per cell %d, populated cells %d, total tokens in cache %d, largest empty slot=%d @ %d\n", + view.n_cells, view.n_max_seq, view.used_cells, view.token_count, view.max_contiguous, view.max_contiguous_idx); + + std::unordered_map seqs; + llama_kv_cache_view_cell * c_curr = view.cells; + llama_seq_id * cs_curr = view.cells_sequences; + + for (int i = 0; i < view.n_cells; i++, c_curr++, cs_curr += view.n_max_seq) { + for (int j = 0; j < view.n_max_seq; j++) { + if (cs_curr[j] < 0) { continue; } + if (seqs.find(cs_curr[j]) == seqs.end()) { + if (seqs.size() + 1 >= sizeof(slot_chars)) { break; } + seqs[cs_curr[j]] = seqs.size(); + } + } + if (seqs.size() + 1 >= sizeof(slot_chars)) { break; } + } + + printf("=== Sequence legend: "); + for (const auto & it : seqs) { + printf("%zu=%d, ", it.second, it.first); + } + printf("'+'=other sequence ids"); + + c_curr = view.cells; + cs_curr = view.cells_sequences; + for (int i = 0; i < view.n_cells; i++, c_curr++, cs_curr += view.n_max_seq) { + if (i % row_size == 0) { + printf("\n%5d: ", i); + } + for (int j = 0; j < view.n_max_seq; j++) { + if (cs_curr[j] >= 0) { + const auto & it = seqs.find(cs_curr[j]); + putchar(it != seqs.end() ? int(slot_chars[it->second]) : '+'); + } else { + putchar('.'); + } + } + putchar(' '); + } + + printf("\n=== Done dumping\n"); +} diff --git a/common/common.h b/common/common.h index 88fa13fc067c2..dc57b0ae6e174 100644 --- a/common/common.h +++ b/common/common.h @@ -218,3 +218,13 @@ std::string get_sortable_timestamp(); void dump_non_result_info_yaml( FILE * stream, const gpt_params & params, const llama_context * lctx, const std::string & timestamp, const std::vector & prompt_tokens, const char * model_desc); + +// +// KV cache utils +// + +// Dump the KV cache view with the number of sequences per cell. +void dump_kv_cache_view(const llama_kv_cache_view & view, int row_size = 80); + +// Dump the KV cache view showing individual sequences in each cell (long output). +void dump_kv_cache_view_seqs(const llama_kv_cache_view & view, int row_size = 40); diff --git a/examples/parallel/parallel.cpp b/examples/parallel/parallel.cpp index a78df305f415c..8cc20b422d0ce 100644 --- a/examples/parallel/parallel.cpp +++ b/examples/parallel/parallel.cpp @@ -172,6 +172,8 @@ int main(int argc, char ** argv) { int32_t n_total_gen = 0; int32_t n_cache_miss = 0; + struct llama_kv_cache_view kvc_view = llama_kv_cache_view_init(ctx, n_clients); + const auto t_main_start = ggml_time_us(); LOG_TEE("%s: Simulating parallel requests from clients:\n", __func__); @@ -201,6 +203,9 @@ int main(int argc, char ** argv) { LOG_TEE("Processing requests ...\n\n"); while (true) { + llama_kv_cache_view_update(ctx, &kvc_view); + dump_kv_cache_view_seqs(kvc_view, 40); + llama_batch_clear(batch); // decode any currently ongoing sequences diff --git a/llama.cpp b/llama.cpp index 5679c7050d80b..9fb7244b41cf5 100644 --- a/llama.cpp +++ b/llama.cpp @@ -8805,6 +8805,95 @@ int llama_model_apply_lora_from_file(const struct llama_model * model, const cha } } +struct llama_kv_cache_view llama_kv_cache_view_init(const struct llama_context * ctx, int32_t n_max_seq) { + struct llama_kv_cache_view result = { + /*.n_cells = */ 0, + /*.n_max_seq = */ n_max_seq, + /*.token_count = */ 0, + /*.used_cells = */ llama_get_kv_cache_used_cells(ctx), + /*.max_contiguous = */ 0, + /*.max_contiguous_idx = */ -1, + /*.cells = */ nullptr, + /*.cells_sequences = */ nullptr, + }; + return result; +} + +void llama_kv_cache_view_free(struct llama_kv_cache_view * view) { + if (view->cells != nullptr) { + free(view->cells); + view->cells = nullptr; + } + if (view->cells_sequences != nullptr) { + free(view->cells_sequences); + view->cells_sequences = nullptr; + } +} + +void llama_kv_cache_view_update(const struct llama_context * ctx, struct llama_kv_cache_view * view) { + if (uint32_t(view->n_cells) < ctx->kv_self.size || view->cells == nullptr) { + view->n_cells = int32_t(ctx->kv_self.size); + void * p = realloc(view->cells, sizeof(struct llama_kv_cache_view_cell) * view->n_cells); + GGML_ASSERT(p != nullptr && "Failed to alloc kv_cache_view cells"); + view->cells = (struct llama_kv_cache_view_cell *)p; + p = realloc(view->cells_sequences, sizeof(llama_seq_id) * view->n_max_seq * view->n_cells); + GGML_ASSERT(p != nullptr && "Failed to alloc kv_cache_view cells sequences"); + view->cells_sequences = (llama_seq_id *)p; + } + + const std::vector & kv_cells = ctx->kv_self.cells; + llama_kv_cache_view_cell * c_curr = view->cells; + llama_seq_id * cs_curr = view->cells_sequences; + int32_t used_cells = 0; + int32_t token_count = 0; + int32_t curr_contig_idx = -1; + uint32_t max_contig = 0; + int32_t max_contig_idx = -1; + + for (int32_t i = 0; i < int32_t(ctx->kv_self.size); i++, c_curr++, cs_curr += view->n_max_seq) { + const size_t curr_size = kv_cells[i].seq_id.size(); + token_count += curr_size; + c_curr->pos = kv_cells[i].pos + kv_cells[i].delta; + + if (curr_size > 0) { + if (curr_contig_idx >= 0 && uint32_t(i - curr_contig_idx) > max_contig) { + max_contig = i - curr_contig_idx; + max_contig_idx = curr_contig_idx; + } + curr_contig_idx = -1; + } else if (curr_contig_idx < 0) { + curr_contig_idx = i; + } + + int seq_idx = 0; + for (const llama_seq_id it : kv_cells[i].seq_id) { + if (seq_idx >= view->n_max_seq) { + break; + } + cs_curr[seq_idx] = it; + seq_idx++; + } + if (seq_idx != 0) { + used_cells++; + } + for (; seq_idx < view->n_max_seq; seq_idx++) { + cs_curr[seq_idx] = -1; + } + } + if (curr_contig_idx >= 0 && kv_cells.size() - curr_contig_idx > max_contig) { + max_contig_idx = curr_contig_idx; + max_contig = kv_cells.size() - curr_contig_idx; + } + view->max_contiguous = max_contig; + view->max_contiguous_idx = max_contig_idx; + view->token_count = token_count; + view->used_cells = used_cells; + if (uint32_t(used_cells) != ctx->kv_self.used) { + LLAMA_LOG_ERROR("%s: used cells mismatch. kv_cache says %d but we calculated %d\n", + __func__, ctx->kv_self.used, used_cells); + } +} + int llama_get_kv_cache_token_count(const struct llama_context * ctx) { int result = 0; diff --git a/llama.h b/llama.h index 06b982ee022d6..3208f158cf833 100644 --- a/llama.h +++ b/llama.h @@ -361,6 +361,54 @@ extern "C" { // KV cache // + // Information associated with an individual cell in the KV cache view. + struct llama_kv_cache_view_cell { + // The position for this cell. Takes KV cache shifts into account. + // May be negative if the cell is not populated. + llama_pos pos; + }; + + // An updateable view of the KV cache. + struct llama_kv_cache_view { + // Number of KV cache cells. This will be the same as the context size. + int32_t n_cells; + + // Maximum number of sequences that can exist in a cell. It's not an error + // if there are more sequences in a cell than this value, however they will + // not be visible in the view cells_sequences. + int32_t n_max_seq; + + // Number of tokens in the cache. For example, if there are two populated + // cells, the first with 1 sequence id in it and the second with 2 sequence + // ids then you'll have 3 tokens. + int32_t token_count; + + // Number of populated cache cells. + int32_t used_cells; + + // Maximum contiguous empty slots in the cache. + int32_t max_contiguous; + + // Index to the start of the max_contiguous slot range. Can be negative + // when cache is full. + int32_t max_contiguous_idx; + + // Information for an individual cell. + struct llama_kv_cache_view_cell * cells; + + // The sequences for each cell. There will be n_max_seq items per cell. + llama_seq_id * cells_sequences; + }; + + // Create an empty KV cache view. + LLAMA_API struct llama_kv_cache_view llama_kv_cache_view_init(const struct llama_context * ctx, int32_t n_max_seq); + + // Free a KV cache view. + LLAMA_API void llama_kv_cache_view_free(struct llama_kv_cache_view * view); + + // Update the KV cache view structure with the current state of the KV cache. + LLAMA_API void llama_kv_cache_view_update(const struct llama_context * ctx, struct llama_kv_cache_view * view); + // Returns the number of tokens in the KV cache (slow, use only for debug) // If a KV cell has multiple sequences assigned to it, it will be counted multiple times LLAMA_API int llama_get_kv_cache_token_count(const struct llama_context * ctx);