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llama: automatically set parameters not set by the user in such a way that maximizes GPU utilization (#16653)

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* llama: automatically fit args to free memory

llama-fit-params tool

* fix CI

* hints for bug reports, ensure no reallocation

* fix segfault with Vulkan

* add llama-fit-params to CI

* fix CI

* fix CI

* fix CI

* minor adjustments

* fix assignment of 1 dense layer

* fix logger not being reset on model load failure

* remove --n-gpu-layer hint on model load failure

* fix llama-fit-params verbosity

* fix edge case

* fix typo [no ci]
This commit is contained in:
Johannes Gäßler
2025-12-15 09:24:59 +01:00
committed by GitHub
parent 4aced7a631
commit b1f3a6e5db
26 changed files with 1075 additions and 63 deletions
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src/llama-model.cpp
+31 -7
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@@ -6606,9 +6606,11 @@ bool llama_model::load_tensors(llama_model_loader & ml) {
std::vector<ggml_backend_buffer_ptr> bufs;
if (ml.use_mmap && use_mmap_buffer && buffer_from_host_ptr_supported && is_default_buft) {
GGML_ASSERT(!ml.no_alloc);
for (uint32_t idx = 0; idx < ml.files.size(); idx++) {
// only the mmap region containing the tensors in the model is mapped to the backend buffer
// this is important for metal with apple silicon: if the entire model could be mapped to a metal buffer, then we could just use metal for all layers
// this is important for metal with apple silicon: if the entire model could be mapped to a metal buffer,
// then we could just use metal for all layers
// this allows using partial offloading when the model size exceeds the metal buffer size, but not the RAM size
void * addr = nullptr;
size_t first, last; // NOLINT
@@ -6624,9 +6626,16 @@ bool llama_model::load_tensors(llama_model_loader & ml) {
bufs.emplace_back(buf);
buf_map.emplace(idx, buf);
}
}
else {
ggml_backend_buffer_t buf = ggml_backend_alloc_ctx_tensors_from_buft(ctx, buft);
} else {
ggml_backend_buffer_t buf;
if (ml.no_alloc) {
buf = ggml_backend_buft_alloc_buffer(buft, /*size =*/ 0); // dummy buffer
for (ggml_tensor * t = ggml_get_first_tensor(ctx); t != nullptr; t = ggml_get_next_tensor(ctx, t)) {
t->buffer = buf; // set dummy buffer for weights so that the backend scheduler won't try to allocate them
}
} else {
buf = ggml_backend_alloc_ctx_tensors_from_buft(ctx, buft); // real buffer
}
if (buf == nullptr) {
throw std::runtime_error(format("unable to allocate %s buffer", ggml_backend_buft_name(buft)));
}
@@ -6681,6 +6690,10 @@ bool llama_model::load_tensors(llama_model_loader & ml) {
}
}
if (ml.no_alloc) {
return true;
}
// load tensor data
for (auto & [ctx, buf_map] : ctx_buf_maps) {
if (!ml.load_all_data(ctx, buf_map, use_mlock ? &pimpl->mlock_mmaps : NULL, params.progress_callback, params.progress_callback_user_data)) {
@@ -6723,9 +6736,18 @@ size_t llama_model::n_devices() const {
std::map<ggml_backend_buffer_type_t, size_t> llama_model::memory_breakdown() const {
std::map<ggml_backend_buffer_type_t, size_t> ret;
for (const auto & [_, bufs] : pimpl->ctxs_bufs) {
for (const auto & buf : bufs) {
ret[ggml_backend_buffer_get_type(buf.get())] += ggml_backend_buffer_get_size(buf.get());
for (const auto & [ctx, bufs] : pimpl->ctxs_bufs) {
if (hparams.no_alloc) {
GGML_ASSERT(bufs.size() == 1);
ggml_backend_buffer_t buf = bufs[0].get();
GGML_ASSERT(ggml_backend_buffer_get_base(buf) == nullptr);
ggml_backend_buffer_type_t buft = ggml_backend_buffer_get_type(buf);
ret[buft] += ggml_backend_alloc_ctx_tensors_from_buft_size(ctx.get(), buft);
} else {
for (const auto & buf : bufs) {
// GGML_ASSERT(ggml_backend_buffer_get_base(buf.get()) != nullptr); // multi_buffer does not have a defined base
ret[ggml_backend_buffer_get_type(buf.get())] += ggml_backend_buffer_get_size(buf.get());
}
}
}
return ret;
@@ -6770,6 +6792,7 @@ void llama_model::print_info() const {
// hparams
LLAMA_LOG_INFO("%s: arch = %s\n", __func__, arch_name().c_str());
LLAMA_LOG_INFO("%s: vocab_only = %d\n", __func__, hparams.vocab_only);
LLAMA_LOG_INFO("%s: no_alloc = %d\n", __func__, hparams.no_alloc);
if (!hparams.vocab_only) {
LLAMA_LOG_INFO("%s: n_ctx_train = %u\n", __func__, hparams.n_ctx_train);
@@ -7618,6 +7641,7 @@ llama_model_params llama_model_default_params() {
/*.check_tensors =*/ false,
/*.use_extra_bufts =*/ true,
/*.no_host =*/ false,
/*.no_alloc =*/ false,
};
return result;