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@ -12,6 +12,13 @@
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#include <cassert>
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#include <cstring>
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// headers for POSIX mmap
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#if defined (__unix__) || defined (__APPLE__)
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# include <sys/mman.h>
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# include <fcntl.h>
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# include <unistd.h>
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#endif
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#define LLAMA_USE_SCRATCH
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#define LLAMA_MAX_SCRATCH_BUFFERS 16
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@ -246,6 +253,7 @@ static bool kv_cache_init(
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struct ggml_init_params params;
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params.mem_size = cache.buf.size();
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params.mem_buffer = cache.buf.data();
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params.no_alloc = false;
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cache.ctx = ggml_init(params);
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@ -288,6 +296,26 @@ struct llama_context_params llama_context_default_params() {
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// model loading
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//
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void * mmap_file(const char* fname) {
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#if defined(MAP_FAILED)
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// POSIX mmap
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int fd = open(fname, O_RDONLY);
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size_t len = lseek(fd, 0, SEEK_END);
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void * mm_addr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
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if (mm_addr == MAP_FAILED) {
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perror("mmap failed");
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mm_addr = NULL;
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}
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close(fd);
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return mm_addr;
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#else
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// TODO: windows support
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(void)(fname); // suppress warnings
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return NULL;
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#endif
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}
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static bool llama_model_load(
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const std::string & fname,
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llama_context & lctx,
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@ -303,6 +331,7 @@ static bool llama_model_load(
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lctx.t_start_us = t_start_us;
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// TODO: this could probably be smaller when using mmap
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std::vector<char> f_buf(1024*1024);
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auto & model = lctx.model;
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@ -449,39 +478,49 @@ static bool llama_model_load(
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}
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}
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bool use_mmap = (n_parts == 1);
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// try to memory map the model file
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void* mm_addr = NULL;
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if (use_mmap) {
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mm_addr = mmap_file(fname.c_str());
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if (mm_addr == NULL) {
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use_mmap = false;
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}
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}
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auto & ctx = model.ctx;
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size_t ctx_size = 0;
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{
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const auto & hparams = model.hparams;
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const int n_embd = hparams.n_embd;
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const int n_layer = hparams.n_layer;
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const int n_ctx = hparams.n_ctx;
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const int n_vocab = hparams.n_vocab;
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ctx_size += n_embd*n_vocab*ggml_type_sizef(vtype); // tok_embeddings
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if (!use_mmap) {
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ctx_size += n_embd*n_vocab*ggml_type_sizef(vtype); // tok_embeddings
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ctx_size += n_embd*ggml_type_sizef(GGML_TYPE_F32); // norm
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ctx_size += n_embd*ggml_type_sizef(GGML_TYPE_F32); // norm
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ctx_size += n_embd*n_vocab*ggml_type_sizef(vtype); // output
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ctx_size += n_embd*n_vocab*ggml_type_sizef(vtype); // output
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ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // attention_norm
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ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // attention_norm
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wq
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wk
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wv
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wo
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wq
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wk
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wv
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ctx_size += n_layer*(n_embd*n_embd*ggml_type_sizef(wtype)); // wo
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ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ffn_norm
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ctx_size += n_layer*(n_embd*ggml_type_sizef(GGML_TYPE_F32)); // ffn_norm
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w1
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w2
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w3
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ctx_size += n_ctx*n_layer*n_embd*ggml_type_sizef(memory_type); // memory_k
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ctx_size += n_ctx*n_layer*n_embd*ggml_type_sizef(memory_type); // memory_v
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w1
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w2
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ctx_size += n_layer*(n_ff*n_embd*ggml_type_sizef(wtype)); // w3
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}
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ctx_size += (5 + 10*n_layer)*256; // object overhead
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@ -514,6 +553,7 @@ static bool llama_model_load(
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struct ggml_init_params params = {
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/*.mem_size =*/ lctx.model.buf.size(),
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/*.mem_buffer =*/ lctx.model.buf.data(),
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/*.no_alloc =*/ use_mmap,
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};
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model.ctx = ggml_init(params);
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@ -595,7 +635,7 @@ static bool llama_model_load(
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fname_part += "." + std::to_string(i);
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}
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fprintf(stderr, "%s: loading model part %d/%d from '%s'\n", __func__, i+1, n_parts, fname_part.c_str());
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fprintf(stderr, "%s: loading model part %d/%d from '%s'%s\n", __func__, i+1, n_parts, fname_part.c_str(), use_mmap ? " (memory mapped)" : "");
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fin = std::ifstream(fname_part, std::ios::binary);
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fin.rdbuf()->pubsetbuf(f_buf.data(), f_buf.size());
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@ -736,7 +776,14 @@ static bool llama_model_load(
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}
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if (part_id == 0) {
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fin.read(reinterpret_cast<char *>(tensor->data), ggml_nbytes(tensor));
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if (mm_addr) {
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off_t offset = fin.tellg();
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tensor->data = (char *) mm_addr + offset;
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fin.seekg(ggml_nbytes(tensor), std::ios::cur);
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}
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else {
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fin.read(reinterpret_cast<char *>(tensor->data), ggml_nbytes(tensor));
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}
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} else {
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fin.seekg(ggml_nbytes(tensor), std::ios::cur);
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}
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@ -849,6 +896,7 @@ static bool llama_eval_internal(
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struct ggml_init_params params = {
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/*.mem_size =*/ buf_compute.size(),
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/*.mem_buffer =*/ buf_compute.data(),
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/*.no_alloc =*/ false,
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};
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struct ggml_context * ctx0 = ggml_init(params);
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