Replace time.time() to time.perf_counter() for benchmarking. (#6178)

Signed-off-by: Lifu Huang <lifu.hlf@gmail.com>

benchmark/tip_suggestion/bench_other.py

@@ -68,7 +68,7 @@ def main(args):
     call_generate = partial(get_call_generate(args), temperature=0)
 
     # Run requests
-    tic = time.time()
+    tic = time.perf_counter()
     if args.backend != "lmql":
 
         def get_one_answer(i):
@@ -102,7 +102,7 @@ def main(args):
             loop.run_until_complete(
                 asyncio.gather(*[get_one_answer_async(i) for i in batch])
             )
-    latency = time.time() - tic
+    latency = time.perf_counter() - tic
 
     # Compute accuracy
     print(f"Latency: {latency:.3f}")