llama.cpp/example/batched-bench

Benchmark the batched decoding performance of llama.cpp

Usage

There are 2 modes of operation:

prompt not shared - each batch has a separate prompt of size PP (i.e. N_KV = B*(PP + TG))
prompt is shared - there is a common prompt of size PP used by all batches (i.e. N_KV = PP + B*TG)

bash

./llama-batched-bench -m model.gguf -c 2048 -b 2048 -ub 512 -npp 128,256,512 -ntg 128,256 -npl 1,2,4,8,16,32 [-pps]

# LLaMA 7B, F16, N_KV_MAX = 16384 (8GB), prompt not shared
./llama-batched-bench -m ./models/llama-7b/ggml-model-f16.gguf -c 16384 -b 2048 -ub 512 -ngl 99

# LLaMA 7B, Q8_0, N_KV_MAX = 16384 (8GB), prompt is shared
./llama-batched-bench -m ./models/llama-7b/ggml-model-q8_0.gguf -c 16384 -b 2048 -ub 512 -ngl 99 -pps

# custom set of batches
./llama-batched-bench -m ./models/llama-7b/ggml-model-q8_0.gguf -c 2048 -b 512 -ub 512 -ngl 999 -npp 128,256,512 -ntg 128,256 -npl 1,2,4,8,16,32

Sample results

PP - prompt tokens per batch
TG - generated tokens per batch
B - number of batches
N_KV - required KV cache size
T_PP - prompt processing time (i.e. time to first token)
S_PP - prompt processing speed ((B*PP)/T_PP or PP/T_PP)
T_TG - time to generate all batches
S_TG - text generation speed ((B*TG)/T_TG)
T - total time
S - total speed (i.e. all tokens / total time)

PP	TG	B	N_KV	T_PP s	S_PP t/s	T_TG s	S_TG t/s	T s	S t/s
128	128	1	256	0.108	1186.64	3.079	41.57	3.187	80.32
128	128	2	512	0.198	1295.19	5.029	50.90	5.227	97.95
128	128	4	1024	0.373	1373.96	6.878	74.44	7.251	141.23
128	128	8	2048	0.751	1363.27	7.344	139.43	8.095	252.99
128	128	16	4096	1.570	1304.68	8.455	242.23	10.024	408.60
128	128	32	8192	3.408	1201.73	8.801	465.40	12.209	670.96
128	256	1	384	0.107	1196.70	6.329	40.45	6.436	59.67
128	256	2	768	0.194	1317.45	10.239	50.00	10.433	73.61
128	256	4	1536	0.366	1399.03	13.960	73.35	14.326	107.22
128	256	8	3072	0.751	1363.92	15.110	135.54	15.861	193.69
128	256	16	6144	1.569	1304.93	18.073	226.64	19.642	312.80
128	256	32	12288	3.409	1201.35	19.223	426.15	22.633	542.93

JSONL output

Pass --output-format jsonl to output JSONL instead of Markdown, á la

json

{"n_kv_max": 2048, "n_batch": 2048, "n_ubatch": 512, "flash_attn": 0, "is_pp_shared": 0, "n_gpu_layers": 99, "n_threads": 8, "n_threads_batch": 8, "pp": 128, "tg": 128, "pl": 1, "n_kv": 256, "t_pp": 0.233810, "speed_pp": 547.453064, "t_tg": 3.503684, "speed_tg": 36.532974, "t": 3.737494, "speed": 68.495094}
{"n_kv_max": 2048, "n_batch": 2048, "n_ubatch": 512, "flash_attn": 0, "is_pp_shared": 0, "n_gpu_layers": 99, "n_threads": 8, "n_threads_batch": 8, "pp": 128, "tg": 128, "pl": 2, "n_kv": 512, "t_pp": 0.422602, "speed_pp": 605.770935, "t_tg": 11.106112, "speed_tg": 23.050371, "t": 11.528713, "speed": 44.410854}