[8/N] enable cli flag without a space (#10529)

Signed-off-by: youkaichao <youkaichao@gmail.com>

tests/compile/test_basic_correctness.py

@@ -103,7 +103,7 @@ def test_compile_correctness(test_setting: TestSetting):
             CompilationLevel.NO_COMPILATION,
             CompilationLevel.PIECEWISE,
     ]:
-        all_args.append(final_args + ["-O", str(level)])
+        all_args.append(final_args + [f"-O{level}"])
         all_envs.append({})
 
     # inductor will change the output, so we only compare if the output
@@ -121,7 +121,7 @@ def test_compile_correctness(test_setting: TestSetting):
             CompilationLevel.DYNAMO_AS_IS,
             CompilationLevel.DYNAMO_ONCE,
     ]:
-        all_args.append(final_args + ["-O", str(level)])
+        all_args.append(final_args + [f"-O{level}"])
         all_envs.append({})
         if level != CompilationLevel.DYNAMO_ONCE and not fullgraph:
             # "DYNAMO_ONCE" will always use fullgraph

tests/engine/test_arg_utils.py

@@ -31,6 +31,34 @@ def test_limit_mm_per_prompt_parser(arg, expected):
     assert args.limit_mm_per_prompt == expected
 
 
+def test_compilation_config():
+    parser = EngineArgs.add_cli_args(FlexibleArgumentParser())
+
+    # default value
+    args = parser.parse_args([])
+    assert args.compilation_config is None
+
+    # set to O3
+    args = parser.parse_args(["-O3"])
+    assert args.compilation_config.level == 3
+
+    # set to O 3 (space)
+    args = parser.parse_args(["-O", "3"])
+    assert args.compilation_config.level == 3
+
+    # set to O 3 (equals)
+    args = parser.parse_args(["-O=3"])
+    assert args.compilation_config.level == 3
+
+    # set to json
+    args = parser.parse_args(["--compilation-config", '{"level": 3}'])
+    assert args.compilation_config.level == 3
+
+    # set to json
+    args = parser.parse_args(['--compilation-config={"level": 3}'])
+    assert args.compilation_config.level == 3
+
+
 def test_valid_pooling_config():
     parser = EngineArgs.add_cli_args(FlexibleArgumentParser())
     args = parser.parse_args([

tests/tpu/test_custom_dispatcher.py

@@ -13,9 +13,10 @@ os.environ["VLLM_RPC_TIMEOUT"] = "30000"
 def test_custom_dispatcher():
     compare_two_settings(
         "google/gemma-2b",
-        arg1=["--enforce-eager", "-O",
-              str(CompilationLevel.DYNAMO_ONCE)],
-        arg2=["--enforce-eager", "-O",
-              str(CompilationLevel.DYNAMO_AS_IS)],
+        arg1=[
+            "--enforce-eager",
+            f"-O{CompilationLevel.DYNAMO_ONCE}",
+        ],
+        arg2=["--enforce-eager", f"-O{CompilationLevel.DYNAMO_AS_IS}"],
         env1={},
         env2={})

vllm/engine/arg_utils.py

@@ -882,7 +882,10 @@ class EngineArgs:
                             'testing only. level 3 is the recommended level '
                             'for production.\n'
                             'To specify the full compilation config, '
-                            'use a JSON string.')
+                            'use a JSON string.\n'
+                            'Following the convention of traditional '
+                            'compilers, using -O without space is also '
+                            'supported. -O3 is equivalent to -O 3.')
 
         return parser
 

vllm/utils.py

@@ -1192,6 +1192,10 @@ class FlexibleArgumentParser(argparse.ArgumentParser):
                 else:
                     processed_args.append('--' +
                                           arg[len('--'):].replace('_', '-'))
+            elif arg.startswith('-O') and arg != '-O' and len(arg) == 2:
+                # allow -O flag to be used without space, e.g. -O3
+                processed_args.append('-O')
+                processed_args.append(arg[2:])
             else:
                 processed_args.append(arg)