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talk-llama : sync llama.cpp

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This commit is contained in:
Georgi Gerganov
2025-12-31 17:52:09 +02:00
parent 54fa8216ea
commit 7359ac94d5
23 changed files with 1125 additions and 198 deletions
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examples/talk-llama/llama.cpp
+73 -68
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@@ -140,6 +140,10 @@ enum layer_fraction_t {
};
// this enum is only used in llama_params_fit_impl but needs to be defined outside of it to fix a Windows compilation issue
class llama_params_fit_exception : public std::runtime_error {
using std::runtime_error::runtime_error;
};
static void llama_params_fit_impl(
const char * path_model, struct llama_model_params * mparams, struct llama_context_params * cparams,
float * tensor_split, struct llama_model_tensor_buft_override * tensor_buft_overrides,
@@ -181,12 +185,11 @@ static void llama_params_fit_impl(
}
}
int64_t sum_total = 0;
int64_t sum_free = 0;
int64_t sum_projected_free = 0;
int64_t min_projected_free = INT64_MAX;
int64_t sum_projected_used = 0;
int64_t sum_projected_model = 0;
int64_t sum_projected_ctx = 0;
if (nd > 1) {
LLAMA_LOG_INFO("%s: projected memory use with initial parameters [MiB]:\n", __func__);
@@ -197,12 +200,11 @@ static void llama_params_fit_impl(
const int64_t projected_used = dmd.mb.total();
const int64_t projected_free = dmd.free - projected_used;
sum_total += dmd.total;
sum_free += dmd.free;
sum_projected_used += projected_used;
sum_projected_free += projected_free;
min_projected_free = std::min(min_projected_free, projected_free);
sum_projected_model += dmd.mb.model;
sum_projected_ctx += dmd.mb.context;
if (nd > 1) {
LLAMA_LOG_INFO("%s: - %s: %6" PRId64 " total, %6" PRId64 " used, %6" PRId64 " %s\n",
@@ -210,10 +212,9 @@ static void llama_params_fit_impl(
projected_free >= 0 ? "surplus" : "deficit");
}
}
assert(sum_total >= 0 && sum_projected_used >= 0 && sum_projected_ctx >= 0);
assert(sum_projected_used >= sum_projected_ctx);
assert(sum_free >= 0 && sum_projected_used >= 0);
LLAMA_LOG_INFO("%s: projected to use %" PRId64 " MiB of device memory vs. %" PRId64 " MiB of free device memory\n",
__func__, sum_projected_used/MiB, sum_total/MiB);
__func__, sum_projected_used/MiB, sum_free/MiB);
if (min_projected_free >= margin) {
if (nd == 1) {
LLAMA_LOG_INFO("%s: will leave %" PRId64 " >= %" PRId64 " MiB of free device memory, no changes needed\n",
@@ -236,9 +237,7 @@ static void llama_params_fit_impl(
__func__, margin/MiB, -global_surplus/MiB);
if (cparams->n_ctx == 0) {
if (hp_nct > n_ctx_min) {
const int64_t bytes_per_ctx = sum_projected_ctx / hp_nct;
int64_t memory_reduction = -global_surplus;
int64_t sum_used_target = sum_free - nd*margin_s;
if (nd > 1) {
// for multiple devices we need to be more conservative in terms of how much context we think can fit:
// - for dense models only whole layers can be assigned to devices
@@ -246,24 +245,34 @@ static void llama_params_fit_impl(
// - on average we expect a waste of 0.5 layers/tensors per device
// - use slightly more than the expected average for nd devices to be safe
const int64_t model_per_layer = sum_projected_model / std::min(uint32_t(mparams->n_gpu_layers), hp_ngl);
memory_reduction += (nd + 1) * model_per_layer / (hp_nex == 0 ? 2 : 6);
sum_used_target -= (nd + 1) * model_per_layer / (hp_nex == 0 ? 2 : 6);
}
uint32_t ctx_reduction = std::min(uint32_t((memory_reduction + bytes_per_ctx - 1) / bytes_per_ctx), hp_nct - n_ctx_min);
cparams->n_ctx = hp_nct - ctx_reduction;
cparams->n_ctx = std::max(cparams->n_ctx - cparams->n_ctx % 256, n_ctx_min); // round down context for CUDA backend
int64_t sum_projected_used_min_ctx = 0;
cparams->n_ctx = n_ctx_min;
const dmds_t dmds_min_ctx = llama_get_device_memory_data(path_model, mparams, cparams, devs, hp_ngl, hp_nct, hp_nex, log_level);
for (const auto & dmd : dmds_min_ctx) {
sum_projected_used_min_ctx += dmd.mb.total();
}
if (sum_used_target > sum_projected_used_min_ctx) {
// linear interpolation between minimum and maximum context size:
cparams->n_ctx += (hp_nct - n_ctx_min) * (sum_used_target - sum_projected_used_min_ctx)
/ (sum_projected_used - sum_projected_used_min_ctx);
cparams->n_ctx = std::max(cparams->n_ctx - cparams->n_ctx % 256, n_ctx_min); // round down context for CUDA backend
ctx_reduction = hp_nct - cparams->n_ctx;
memory_reduction = ctx_reduction * bytes_per_ctx;
global_surplus += memory_reduction;
LLAMA_LOG_INFO("%s: context size reduced from %" PRIu32 " to %" PRIu32 " -> need %" PRId64 " MiB less memory in total\n",
__func__, hp_nct, cparams->n_ctx, memory_reduction/MiB);
if (global_surplus >= 0) {
const int64_t bytes_per_ctx = (sum_projected_used - sum_projected_used_min_ctx) / (hp_nct - n_ctx_min);
const int64_t memory_reduction = (hp_nct - cparams->n_ctx) * bytes_per_ctx;
LLAMA_LOG_INFO("%s: context size reduced from %" PRIu32 " to %" PRIu32 " -> need %" PRId64 " MiB less memory in total\n",
__func__, hp_nct, cparams->n_ctx, memory_reduction/MiB);
if (nd == 1) {
LLAMA_LOG_INFO("%s: entire model can be fit by reducing context\n", __func__);
return;
}
LLAMA_LOG_INFO("%s: entire model should be fit across devices by reducing context\n", __func__);
} else {
const int64_t memory_reduction = sum_projected_used - sum_projected_used_min_ctx;
LLAMA_LOG_INFO("%s: context size reduced from %" PRIu32 " to %" PRIu32 " -> need %" PRId64 " MiB less memory in total\n",
__func__, hp_nct, cparams->n_ctx, memory_reduction/MiB);
}
} else {
LLAMA_LOG_INFO("%s: default model context size is %" PRIu32 " which is <= the min. context size of %" PRIu32 " -> no change\n",
@@ -276,32 +285,28 @@ static void llama_params_fit_impl(
}
if (mparams->n_gpu_layers != default_mparams.n_gpu_layers) {
throw std::runtime_error("n_gpu_layers already set by user to " + std::to_string(mparams->n_gpu_layers) + ", abort");
throw llama_params_fit_exception("n_gpu_layers already set by user to " + std::to_string(mparams->n_gpu_layers) + ", abort");
}
if (nd > 1) {
if (!tensor_split) {
throw std::runtime_error("did not provide a buffer to write the tensor_split to, abort");
throw llama_params_fit_exception("did not provide a buffer to write the tensor_split to, abort");
}
if (mparams->tensor_split) {
for (size_t id = 0; id < nd; id++) {
if (mparams->tensor_split[id] != 0.0f) {
throw std::runtime_error("model_params::tensor_split already set by user, abort");
throw llama_params_fit_exception("model_params::tensor_split already set by user, abort");
}
}
}
if (mparams->split_mode == LLAMA_SPLIT_MODE_ROW) {
throw std::runtime_error("changing weight allocation for LLAMA_SPLIT_MODE_ROW not implemented, abort");
}
if (hp_ngl < 2*nd) {
throw std::runtime_error("model has only " + std::to_string(hp_ngl) + " layers but need at least "
+ std::to_string(2*nd) + " to fit memory for " + std::to_string(nd) + " devices, abort");
throw llama_params_fit_exception("changing weight allocation for LLAMA_SPLIT_MODE_ROW not implemented, abort");
}
}
if (!tensor_buft_overrides) {
throw std::runtime_error("did not provide buffer to set tensor_buft_overrides, abort");
throw llama_params_fit_exception("did not provide buffer to set tensor_buft_overrides, abort");
}
if (mparams->tensor_buft_overrides && (mparams->tensor_buft_overrides->pattern || mparams->tensor_buft_overrides->buft)) {
throw std::runtime_error("model_params::tensor_buft_overrides already set by user, abort");
throw llama_params_fit_exception("model_params::tensor_buft_overrides already set by user, abort");
}
// step 3: iteratively fill the back to front with "dense" layers
@@ -362,8 +367,7 @@ static void llama_params_fit_impl(
auto set_ngl_tensor_split_tbo = [&](
const std::vector<ngl_t> & ngl_per_device,
const std::vector<ggml_backend_buffer_type_t> & overflow_bufts,
llama_model_params & mparams,
const bool add_nonrepeating) {
llama_model_params & mparams) {
mparams.n_gpu_layers = 0;
for (size_t id = 0; id < nd; id++) {
mparams.n_gpu_layers += ngl_per_device[id].n_layer;
@@ -371,13 +375,9 @@ static void llama_params_fit_impl(
tensor_split[id] = ngl_per_device[id].n_layer;
}
}
assert(uint32_t(mparams.n_gpu_layers) <= hp_ngl);
uint32_t il0 = hp_ngl - mparams.n_gpu_layers; // start index for tensor buft overrides
assert(uint32_t(mparams.n_gpu_layers) <= hp_ngl + 1);
uint32_t il0 = hp_ngl + 1 - mparams.n_gpu_layers; // start index for tensor buft overrides
if (add_nonrepeating) {
mparams.n_gpu_layers += 1;
tensor_split[nd - 1] += 1;
}
mparams.tensor_split = tensor_split;
size_t itbo = 0;
@@ -389,8 +389,8 @@ static void llama_params_fit_impl(
tensor_buft_overrides[itbo].buft = nullptr;
itbo++;
mparams.tensor_buft_overrides = tensor_buft_overrides;
throw std::runtime_error("llama_params_fit_n_tensor_buft_overrides() == "
+ std::to_string(ntbo) + " is insufficient for model\n");
throw llama_params_fit_exception("llama_max_tensor_buft_overrides() == "
+ std::to_string(ntbo) + " is insufficient for model");
}
tensor_buft_overrides[itbo].pattern = get_overflow_pattern(il, il == il0 ? ngl_per_device[id].overflow_type : LAYER_FRACTION_MOE);
tensor_buft_overrides[itbo].buft = overflow_bufts[id];
@@ -408,10 +408,9 @@ static void llama_params_fit_impl(
auto get_memory_for_layers = [&](
const char * func_name,
const std::vector<ngl_t> & ngl_per_device,
const std::vector<ggml_backend_buffer_type_t> & overflow_bufts,
const bool add_nonrepeating) -> std::vector<int64_t> {
const std::vector<ggml_backend_buffer_type_t> & overflow_bufts) -> std::vector<int64_t> {
llama_model_params mparams_copy = *mparams;
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, mparams_copy, add_nonrepeating);
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, mparams_copy);
const dmds_t dmd_nl = llama_get_device_memory_data(
path_model, &mparams_copy, cparams, devs, hp_ngl, hp_nct, hp_nex, log_level);
@@ -469,9 +468,6 @@ static void llama_params_fit_impl(
LLAMA_LOG_DEBUG("%s: id=%zu, target=%" PRId64 " MiB\n", __func__, id, targets[id]/MiB);
}
// whether for the optimal memory use we expect to load at least some MoE tensors:
const bool partial_moe = hp_nex > 0 && global_surplus_cpu_moe > 0;
std::vector<ggml_backend_buffer_type_t> overflow_bufts; // which bufts the partial layers of a device overflow to:
overflow_bufts.reserve(nd);
for (size_t id = 0; id < nd - 1; ++id) {
@@ -480,7 +476,7 @@ static void llama_params_fit_impl(
overflow_bufts.push_back(ggml_backend_cpu_buffer_type());
std::vector<ngl_t> ngl_per_device(nd);
std::vector<int64_t> mem = get_memory_for_layers(__func__, ngl_per_device, overflow_bufts, partial_moe);
std::vector<int64_t> mem = get_memory_for_layers(__func__, ngl_per_device, overflow_bufts);
if (hp_nex > 0) {
for (size_t id = 0; id < nd; id++) {
ngl_per_device[id].overflow_type = LAYER_FRACTION_MOE;
@@ -493,13 +489,14 @@ static void llama_params_fit_impl(
// - interpolate the memory use / layer between low and high linearly to get a guess where it meets our target
// - check memory use of our guess, replace either the low or high bound
// - once we only have a difference of a single layer, stop and return the lower bound that just barely still fits
// - the last device has the output layer, which cannot be a partial layer
if (hp_nex == 0) {
LLAMA_LOG_INFO("%s: filling dense layers back-to-front:\n", __func__);
} else {
LLAMA_LOG_INFO("%s: filling dense-only layers back-to-front:\n", __func__);
}
for (int id = nd - 1; id >= 0; id--) {
uint32_t n_unassigned = hp_ngl;
uint32_t n_unassigned = hp_ngl + 1;
for (size_t jd = id + 1; jd < nd; ++jd) {
assert(n_unassigned >= ngl_per_device[jd].n_layer);
n_unassigned -= ngl_per_device[jd].n_layer;
@@ -508,13 +505,16 @@ static void llama_params_fit_impl(
std::vector<ngl_t> ngl_per_device_high = ngl_per_device;
ngl_per_device_high[id].n_layer = n_unassigned;
if (hp_nex > 0) {
ngl_per_device_high[id].n_part = ngl_per_device_high[id].n_layer;
ngl_per_device_high[id].n_part = size_t(id) < nd - 1 ? ngl_per_device_high[id].n_layer : ngl_per_device_high[id].n_layer - 1;
}
if (ngl_per_device_high[id].n_layer > 0) {
std::vector<int64_t> mem_high = get_memory_for_layers(__func__, ngl_per_device_high, overflow_bufts, partial_moe);
std::vector<int64_t> mem_high = get_memory_for_layers(__func__, ngl_per_device_high, overflow_bufts);
if (mem_high[id] > targets[id]) {
assert(ngl_per_device_high[id].n_layer > ngl_per_device[id].n_layer);
uint32_t delta = ngl_per_device_high[id].n_layer - ngl_per_device[id].n_layer;
if (hp_nex > 0 && size_t(id) == nd - 1) {
delta--;
}
LLAMA_LOG_DEBUG("%s: start filling device %" PRIu32 ", delta=%" PRIu32 "\n", __func__, id, delta);
while (delta > 1) {
uint32_t step_size = int64_t(delta) * (targets[id] - mem[id]) / (mem_high[id] - mem[id]);
@@ -526,7 +526,7 @@ static void llama_params_fit_impl(
if (hp_nex) {
ngl_per_device_test[id].n_part += step_size;
}
const std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts, partial_moe);
const std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts);
if (mem_test[id] <= targets[id]) {
ngl_per_device = ngl_per_device_test;
@@ -542,6 +542,7 @@ static void llama_params_fit_impl(
} else {
assert(ngl_per_device_high[id].n_layer == n_unassigned);
ngl_per_device = ngl_per_device_high;
mem = mem_high;
LLAMA_LOG_DEBUG("%s: set ngl_per_device[%d].n_layer=%" PRIu32 "\n", __func__, id, ngl_per_device[id].n_layer);
}
}
@@ -552,7 +553,7 @@ static void llama_params_fit_impl(
__func__, dev_names[id].c_str(), ngl_per_device[id].n_layer, mem[id]/MiB, projected_margin/MiB);
}
if (hp_nex == 0 || global_surplus_cpu_moe <= 0) {
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, *mparams, partial_moe);
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, *mparams);
return;
}
@@ -575,13 +576,13 @@ static void llama_params_fit_impl(
for (size_t id = 0; id <= id_dense_start; id++) {
std::vector<ngl_t> ngl_per_device_high = ngl_per_device;
for (size_t jd = id_dense_start; jd < nd; jd++) {
const uint32_t n_layer_move = ngl_per_device_high[jd].n_layer;
const uint32_t n_layer_move = jd < nd - 1 ? ngl_per_device_high[jd].n_layer : ngl_per_device_high[jd].n_layer - 1;
ngl_per_device_high[id].n_layer += n_layer_move;
ngl_per_device_high[jd].n_layer -= n_layer_move;
ngl_per_device_high[jd].n_part = 0;
}
size_t id_dense_start_high = nd - 1;
std::vector<int64_t> mem_high = get_memory_for_layers(__func__, ngl_per_device_high, overflow_bufts, partial_moe);
std::vector<int64_t> mem_high = get_memory_for_layers(__func__, ngl_per_device_high, overflow_bufts);
if (mem_high[id] > targets[id]) {
assert(ngl_per_device_high[id].n_layer >= ngl_per_device_high[id].n_part);
@@ -609,7 +610,7 @@ static void llama_params_fit_impl(
break;
}
}
const std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts, partial_moe);
const std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts);
if (mem_test[id] <= targets[id]) {
ngl_per_device = ngl_per_device_test;
@@ -629,13 +630,14 @@ static void llama_params_fit_impl(
}
} else {
ngl_per_device = ngl_per_device_high;
mem = mem_high;
id_dense_start = id_dense_start_high;
LLAMA_LOG_DEBUG("%s: set ngl_per_device[%zu].(n_layer, n_part)=(%" PRIu32 ", %" PRIu32 "), id_dense_start=%zu\n",
__func__, id, ngl_per_device[id].n_layer, ngl_per_device[id].n_part, id_dense_start);
}
// try to fit at least part of one more layer
if (ngl_per_device[id_dense_start].n_layer > 0) {
if (ngl_per_device[id_dense_start].n_layer > (id < nd - 1 ? 0 : 1)) {
std::vector<ngl_t> ngl_per_device_test = ngl_per_device;
size_t id_dense_start_test = id_dense_start;
ngl_per_device_test[id_dense_start_test].n_layer--;
@@ -647,8 +649,8 @@ static void llama_params_fit_impl(
}
ngl_per_device_test[id].overflow_type = LAYER_FRACTION_UP;
LLAMA_LOG_DEBUG("%s: trying to fit one extra layer with overflow_type=LAYER_FRACTION_UP\n", __func__);
std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts, partial_moe);
if (mem_test[id] < targets[id]) {
std::vector<int64_t> mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts);
if (mem_test[id] < targets[id] && (id + 1 == nd || mem_test[id + 1] < targets[id + 1])) {
ngl_per_device = ngl_per_device_test;
mem = mem_test;
id_dense_start = id_dense_start_test;
@@ -657,8 +659,8 @@ static void llama_params_fit_impl(
ngl_per_device_test[id].overflow_type = LAYER_FRACTION_GATE;
LLAMA_LOG_DEBUG("%s: trying to fit one extra layer with overflow_type=LAYER_FRACTION_GATE\n", __func__);
mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts, partial_moe);
if (mem_test[id] < targets[id]) {
mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts);
if (mem_test[id] < targets[id] && (id + 1 == nd || mem_test[id + 1] < targets[id + 1])) {
ngl_per_device = ngl_per_device_test;
mem = mem_test;
id_dense_start = id_dense_start_test;
@@ -668,8 +670,8 @@ static void llama_params_fit_impl(
} else {
ngl_per_device_test[id].overflow_type = LAYER_FRACTION_ATTN;
LLAMA_LOG_DEBUG("%s: trying to fit one extra layer with overflow_type=LAYER_FRACTION_ATTN\n", __func__);
mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts, partial_moe);
if (mem_test[id] < targets[id]) {
mem_test = get_memory_for_layers(__func__, ngl_per_device_test, overflow_bufts);
if (mem_test[id] < targets[id] && (id + 1 == nd || mem_test[id + 1] < targets[id + 1])) {
ngl_per_device = ngl_per_device_test;
mem = mem_test;
id_dense_start = id_dense_start_test;
@@ -685,25 +687,28 @@ static void llama_params_fit_impl(
__func__, dev_names[id].c_str(), ngl_per_device[id].n_layer, ngl_per_device[id].n_part, mem[id]/MiB, projected_margin/MiB);
}
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, *mparams, partial_moe);
set_ngl_tensor_split_tbo(ngl_per_device, overflow_bufts, *mparams);
}
bool llama_params_fit(
enum llama_params_fit_status llama_params_fit(
const char * path_model, struct llama_model_params * mparams, struct llama_context_params * cparams,
float * tensor_split, struct llama_model_tensor_buft_override * tensor_buft_overrides,
size_t margin_s, uint32_t n_ctx_min, enum ggml_log_level log_level) {
const int64_t t0_us = llama_time_us();
bool ok = true;
llama_params_fit_status status = LLAMA_PARAMS_FIT_STATUS_SUCCESS;
try {
llama_params_fit_impl(path_model, mparams, cparams, tensor_split, tensor_buft_overrides, margin_s, n_ctx_min, log_level);
LLAMA_LOG_INFO("%s: successfully fit params to free device memory\n", __func__);
} catch (const std::runtime_error & e) {
} catch (const llama_params_fit_exception & e) {
LLAMA_LOG_WARN("%s: failed to fit params to free device memory: %s\n", __func__, e.what());
ok = false;
status = LLAMA_PARAMS_FIT_STATUS_FAILURE;
} catch (const std::runtime_error & e) {
LLAMA_LOG_ERROR("%s: encountered an error while trying to fit params to free device memory: %s\n", __func__, e.what());
status = LLAMA_PARAMS_FIT_STATUS_ERROR;
}
const int64_t t1_us = llama_time_us();
LLAMA_LOG_INFO("%s: fitting params to free memory took %.2f seconds\n", __func__, (t1_us - t0_us) * 1e-6);
return ok;
return status;
}
struct llama_sampler_chain_params llama_sampler_chain_default_params() {