llama : model-based max number of graph nodes calculation (ggml-org#8970)

* llama : model-based max number of graph nodes calculation

* Update src/llama.cpp

---------

Co-authored-by: slaren <[email protected]>

Author: nicoboss

src/llama.cpp

@@ -3575,13 +3575,8 @@ namespace GGUFMeta {
 
 using llama_buf_map = std::unordered_map<uint32_t, ggml_backend_buffer_t>;
 
-// TODO: update when needed or think of some clever automatic way to do this
-static size_t llama_model_max_nodes(const llama_model & /*model*/) {
-    //if (model.arch == LLM_ARCH_LLAMA && model.hparams.n_layer > ??) { // llama-3 405B
-    //    return 32768;
-    //}
-
-    return 8192;
+static size_t llama_model_max_nodes(const llama_model & model) {
+    return std::max<size_t>(8192, model.tensors_by_name.size()*5);
 }
 
 struct llama_model_loader {