[CI] Cut repeated tokenizer loads, serial subprocesses and a double scan (#36241)

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

test/registered/unit/function_call/test_function_call_parser.py

@@ -1,3 +1,4 @@
+import functools
 import json
 import unittest
 import warnings
@@ -33,10 +34,17 @@ from sglang.srt.function_call.pythonic_detector import PythonicDetector
 from sglang.srt.function_call.qwen3_coder_detector import Qwen3CoderDetector
 from sglang.test.ci.ci_register import register_cpu_ci
 
-register_cpu_ci(est_time=15, suite="base-a-test-cpu")
+register_cpu_ci(est_time=20, suite="base-a-test-cpu")
 register_cpu_ci(est_time=70, suite="base-c-test-cpu")
 
 
+@functools.lru_cache(maxsize=None)
+def _shared_tokenizer(path: str):
+    from sglang.srt.utils.hf_transformers_utils import get_tokenizer
+
+    return get_tokenizer(path)
+
+
 class TestInklingDetector(unittest.TestCase):
     def setUp(self):
         self.tools = [
@@ -1599,9 +1607,7 @@ class TestDeepSeekV32Detector(unittest.TestCase):
             ),
         ]
         self.detector = DeepSeekV32Detector()
-        from sglang.srt.utils.hf_transformers_utils import get_tokenizer
-
-        self.tokenizer = get_tokenizer("deepseek-ai/DeepSeek-V3.2")
+        self.tokenizer = _shared_tokenizer("deepseek-ai/DeepSeek-V3.2")
         self.interval = 1
 
     def test_detect_and_parse_xml_format(self):
@@ -2049,9 +2055,7 @@ class TestDeepSeekV4Detector(unittest.TestCase):
             ),
         ]
         self.detector = DeepSeekV4Detector()
-        from sglang.srt.utils.hf_transformers_utils import get_tokenizer
-
-        self.tokenizer = get_tokenizer("deepseek-ai/DeepSeek-V3.2")
+        self.tokenizer = _shared_tokenizer("deepseek-ai/DeepSeek-V3.2")
         self.interval = 1
 
     def test_detect_and_parse_xml_format(self):