diff --git a/benchmarks/benchmark_throughput.py b/benchmarks/benchmark_throughput.py
index fc578b4972863..a9adda040ca61 100644
--- a/benchmarks/benchmark_throughput.py
+++ b/benchmarks/benchmark_throughput.py
@@ -6,18 +6,21 @@
 from typing import List, Optional, Tuple
 
 import torch
-from transformers import AutoModelForCausalLM, PreTrainedTokenizerBase
+from transformers import (AutoModelForCausalLM, AutoTokenizer,
+                          PreTrainedTokenizerBase)
 from tqdm import tqdm
 
-from vllm import LLM, SamplingParams
-from vllm.transformers_utils.tokenizer import get_tokenizer
-
 
 def sample_requests(
     dataset_path: str,
     num_requests: int,
     tokenizer: PreTrainedTokenizerBase,
+    fixed_output_len: Optional[int],
 ) -> List[Tuple[str, int, int]]:
+    if fixed_output_len is not None:
+        if fixed_output_len < 4:
+            raise ValueError("output_len too small")
+
     # Load the dataset.
     with open(dataset_path) as f:
         dataset = json.load(f)
@@ -35,6 +38,8 @@ def sample_requests(
     tokenized_dataset = []
     for i in range(len(dataset)):
         output_len = len(completion_token_ids[i])
+        if fixed_output_len is not None:
+            output_len = fixed_output_len
         tokenized_dataset.append((prompts[i], prompt_token_ids[i], output_len))
 
     # Filter out too long sequences.
@@ -66,6 +71,7 @@ def run_vllm(
     trust_remote_code: bool,
     dtype: str,
 ) -> float:
+    from vllm import LLM, SamplingParams
     llm = LLM(
         model=model,
         tokenizer=tokenizer,
@@ -160,14 +166,37 @@ def run_hf(
     return end - start
 
 
+def run_mii(
+    requests: List[Tuple[str, int, int]],
+    model: str,
+    tensor_parallel_size: int,
+    output_len: int,
+) -> float:
+    from mii import pipeline
+    llm = pipeline(model, tensor_parallel=tensor_parallel_size)
+    prompts = [prompt for prompt, _, _ in requests]
+
+    start = time.perf_counter()
+    llm(prompts, max_new_tokens=output_len)
+    end = time.perf_counter()
+    return end - start
+
+
 def main(args: argparse.Namespace):
     print(args)
     random.seed(args.seed)
 
     # Sample the requests.
-    tokenizer = get_tokenizer(args.tokenizer,
-                              trust_remote_code=args.trust_remote_code)
-    requests = sample_requests(args.dataset, args.num_prompts, tokenizer)
+    tokenizer = AutoTokenizer.from_pretrained(
+        args.tokenizer, trust_remote_code=args.trust_remote_code)
+    if args.dataset is None:
+        # Synthesize a prompt with the given input length.
+        prompt = "hi" * (args.input_len - 1)
+        requests = [(prompt, args.input_len, args.output_len)
+                    for _ in range(args.num_prompts)]
+    else:
+        requests = sample_requests(args.dataset, args.num_prompts, tokenizer,
+                                   args.output_len)
 
     if args.backend == "vllm":
         elapsed_time = run_vllm(requests, args.model, args.tokenizer,
@@ -179,6 +208,9 @@ def main(args: argparse.Namespace):
         elapsed_time = run_hf(requests, args.model, tokenizer, args.n,
                               args.use_beam_search, args.hf_max_batch_size,
                               args.trust_remote_code)
+    elif args.backend == "mii":
+        elapsed_time = run_mii(requests, args.model, args.tensor_parallel_size,
+                               args.output_len)
     else:
         raise ValueError(f"Unknown backend: {args.backend}")
     total_num_tokens = sum(prompt_len + output_len
@@ -191,12 +223,21 @@ def main(args: argparse.Namespace):
     parser = argparse.ArgumentParser(description="Benchmark the throughput.")
     parser.add_argument("--backend",
                         type=str,
-                        choices=["vllm", "hf"],
+                        choices=["vllm", "hf", "mii"],
                         default="vllm")
     parser.add_argument("--dataset",
                         type=str,
-                        required=True,
+                        default=None,
                         help="Path to the dataset.")
+    parser.add_argument("--input-len",
+                        type=int,
+                        default=None,
+                        help="Input prompt length for each request")
+    parser.add_argument("--output-len",
+                        type=int,
+                        default=None,
+                        help="Output length for each request. Overrides the "
+                        "output length from the dataset.")
     parser.add_argument("--model", type=str, default="facebook/opt-125m")
     parser.add_argument("--tokenizer", type=str, default=None)
     parser.add_argument('--quantization',
@@ -231,6 +272,13 @@ def main(args: argparse.Namespace):
         'for FP32 and FP16 models, and BF16 precision '
         'for BF16 models.')
     args = parser.parse_args()
+    if args.tokenizer is None:
+        args.tokenizer = args.model
+    if args.dataset is None:
+        assert args.input_len is not None
+        assert args.output_len is not None
+    else:
+        assert args.input_len is None
 
     if args.backend == "vllm":
         if args.hf_max_batch_size is not None:
@@ -240,7 +288,18 @@ def main(args: argparse.Namespace):
             raise ValueError("HF max batch size is required for HF backend.")
         if args.quantization is not None:
             raise ValueError("Quantization is only for vLLM backend.")
-    if args.tokenizer is None:
-        args.tokenizer = args.model
-
+    elif args.backend == "mii":
+        if args.dtype != "auto":
+            raise ValueError("dtype must be auto for MII backend.")
+        if args.n != 1:
+            raise ValueError("n must be 1 for MII backend.")
+        if args.use_beam_search:
+            raise ValueError("Beam search is not supported for MII backend.")
+        if args.quantization is not None:
+            raise ValueError("Quantization is only for vLLM backend.")
+        if args.hf_max_batch_size is not None:
+            raise ValueError("HF max batch size is only for HF backend.")
+        if args.tokenizer != args.model:
+            raise ValueError("Tokenizer must be the same as the model for MII "
+                             "backend.")
     main(args)