Update examples and remove not used import

Author: haochengxia

README.md

@@ -76,11 +76,14 @@ req_miss_ratio, byte_miss_ratio = cache.process_trace(reader)
 print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")
 
 # Step 3.1: Further process the first 1000 requests again
-req_miss_ratio, byte_miss_ratio = cache.process_trace(
-    reader,
-    start_req=0,
-    max_req=1000
+cache = lcs.S3FIFO(
+    cache_size=1024 * 1024,
+    # Cache specific parameters
+    small_size_ratio=0.2,
+    ghost_size_ratio=0.8,
+    move_to_main_threshold=2,
 )
+req_miss_ratio, byte_miss_ratio = cache.process_trace(reader, start_req=0, max_req=1000)
 print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")
 ```
 

docs/src/en/getting_started/quickstart.md

@@ -78,11 +78,14 @@ With libcachesim installed, you can start cache simulation for some eviction alg
     print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")
 
     # Step 3.1: Further process the first 1000 requests again
-    req_miss_ratio, byte_miss_ratio = cache.process_trace(
-        reader,
-        start_req=0,
-        max_req=1000
+    cache = lcs.S3FIFO(
+        cache_size=1024 * 1024,
+        # Cache specific parameters
+        small_size_ratio=0.2,
+        ghost_size_ratio=0.8,
+        move_to_main_threshold=2,
     )
+    req_miss_ratio, byte_miss_ratio = cache.process_trace(reader, start_req=0, max_req=1000)
     print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")
     ```
 

libcachesim/_s3_cache.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import hashlib
 import logging
 import os
 import re