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common : more accurate sampling timing (#17382)

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* common : more accurate sampling timing

* eval-callback : minor fixes

* cont : add time_meas impl

* cont : fix log msg [no ci]

* cont : fix multiple definitions of time_meas

* llama-cli : exclude chat template init from time measurement

* cont : print percentage of unaccounted time

* cont : do not reset timings
This commit is contained in:
Georgi Gerganov
2025-11-20 13:40:10 +02:00
committed by GitHub
parent 5088b435d4
commit 196f5083ef
7 changed files with 102 additions and 33 deletions
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68
common/sampling.cpp
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@@ -3,9 +3,10 @@
#include "common.h"
#include "log.h"
#include <cmath>
#include <unordered_map>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <unordered_map>
// the ring buffer works similarly to std::deque, but with a fixed capacity
// TODO: deduplicate with llama-impl.h
@@ -112,6 +113,13 @@ struct common_sampler {
llama_token_data_array cur_p;
void reset() {
prev.clear();
llama_sampler_reset(grmr);
llama_sampler_reset(chain);
}
void set_logits(struct llama_context * ctx, int idx) {
const auto * logits = llama_get_logits_ith(ctx, idx);
@@ -128,6 +136,12 @@ struct common_sampler {
cur_p = { cur.data(), cur.size(), -1, false };
}
common_time_meas tm() {
return common_time_meas(t_total_us, params.no_perf);
}
mutable int64_t t_total_us = 0;
};
std::string common_params_sampling::print() const {
@@ -298,6 +312,8 @@ void common_sampler_free(struct common_sampler * gsmpl) {
}
void common_sampler_accept(struct common_sampler * gsmpl, llama_token token, bool accept_grammar) {
const auto tm = gsmpl->tm();
if (accept_grammar) {
llama_sampler_accept(gsmpl->grmr, token);
}
@@ -308,9 +324,7 @@ void common_sampler_accept(struct common_sampler * gsmpl, llama_token token, boo
}
void common_sampler_reset(struct common_sampler * gsmpl) {
llama_sampler_reset(gsmpl->grmr);
llama_sampler_reset(gsmpl->chain);
gsmpl->reset();
}
struct common_sampler * common_sampler_clone(common_sampler * gsmpl) {
@@ -327,16 +341,54 @@ struct common_sampler * common_sampler_clone(common_sampler * gsmpl) {
void common_perf_print(const struct llama_context * ctx, const struct common_sampler * gsmpl) {
// TODO: measure grammar performance
const double t_sampling_ms = gsmpl ? 1e-3*gsmpl->t_total_us : 0;
llama_perf_sampler_data data_smpl;
llama_perf_context_data data_ctx;
memset(&data_smpl, 0, sizeof(data_smpl));
memset(&data_ctx, 0, sizeof(data_ctx));
if (gsmpl) {
llama_perf_sampler_print(gsmpl->chain);
auto & data = data_smpl;
data = llama_perf_sampler(gsmpl->chain);
// note: the sampling time includes the samplers time + extra time spent in common/sampling
LOG_INF("%s: sampling time = %10.2f ms\n", __func__, t_sampling_ms);
LOG_INF("%s: samplers time = %10.2f ms / %5d tokens\n", __func__, data.t_sample_ms, data.n_sample);
}
if (ctx) {
llama_perf_context_print(ctx);
auto & data = data_ctx;
data = llama_perf_context(ctx);
const double t_end_ms = 1e-3 * ggml_time_us();
const double t_total_ms = t_end_ms - data.t_start_ms;
const double t_unacc_ms = t_total_ms - (t_sampling_ms + data.t_p_eval_ms + data.t_eval_ms);
const double t_unacc_pc = 100.0 * t_unacc_ms / t_total_ms;
LOG_INF("%s: load time = %10.2f ms\n", __func__, data.t_load_ms);
LOG_INF("%s: prompt eval time = %10.2f ms / %5d tokens (%8.2f ms per token, %8.2f tokens per second)\n",
__func__, data.t_p_eval_ms, data.n_p_eval, data.t_p_eval_ms / data.n_p_eval, 1e3 / data.t_p_eval_ms * data.n_p_eval);
LOG_INF("%s: eval time = %10.2f ms / %5d runs (%8.2f ms per token, %8.2f tokens per second)\n",
__func__, data.t_eval_ms, data.n_eval, data.t_eval_ms / data.n_eval, 1e3 / data.t_eval_ms * data.n_eval);
LOG_INF("%s: total time = %10.2f ms / %5d tokens\n", __func__, (t_end_ms - data.t_start_ms), (data.n_p_eval + data.n_eval));
LOG_INF("%s: unaccounted time = %10.2f ms / %5.1f %% (total - sampling - prompt eval - eval) / (total)\n", __func__, t_unacc_ms, t_unacc_pc);
LOG_INF("%s: graphs reused = %10d\n", __func__, data.n_reused);
llama_memory_breakdown_print(ctx);
}
}
llama_token common_sampler_sample(struct common_sampler * gsmpl, struct llama_context * ctx, int idx, bool grammar_first) {
llama_synchronize(ctx);
// start measuring sampling time after the llama_context synchronization in order to not measure any ongoing async operations
const auto tm = gsmpl->tm();
gsmpl->set_logits(ctx, idx);
auto & grmr = gsmpl->grmr;
@@ -428,6 +480,8 @@ uint32_t common_sampler_get_seed(const struct common_sampler * gsmpl) {
// helpers
llama_token_data_array * common_sampler_get_candidates(struct common_sampler * gsmpl, bool do_sort) {
const auto tm = gsmpl->tm();
auto * res = &gsmpl->cur_p;
if (do_sort && !res->sorted) {