Revert "[Fix] Fix slow hasattr in CUDAGraphWrapper.__getattr__ (#1982)"

[ZeldaHuang]

This reverts commit 89fff09.

PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

ref #1982 (comment)

Test Plan

vllm bench serve \
  --omni \
  --dataset-name random \
  --port 8091 \
  --max-concurrency 1 \
  --model /mnt/data/models/Qwen3-Omni-30B-A3B-Instruct/ \
  --endpoint /v1/chat/completions \
  --backend openai-chat-omni \
  --num-prompts 1 \
  --random-input-len 8000 \
  --ignore-eos \
  --percentile-metrics ttft,tpot,itl,e2el,audio_ttfp,audio_rtf \
  --random-output-len 100 \
  --extra_body '{"modalities": ["text", "audio"]}'

Test Result

Before revert:

============ Serving Benchmark Result ============
Successful requests:                     1         
Failed requests:                         0         
Maximum request concurrency:             1         
Benchmark duration (s):                  5.23      
Request throughput (req/s):              0.19      
Peak concurrent requests:                1.00      
----------------End-to-end Latency----------------
Mean E2EL (ms):                          5230.39   
Median E2EL (ms):                        5230.39   
P99 E2EL (ms):                           5230.39   
================== Text Result ===================
Total input tokens:                      8014      
Total generated tokens:                  100       
Output token throughput (tok/s):         19.12     
Peak output token throughput (tok/s):    79.00     
Peak concurrent requests:                1.00      
Total Token throughput (tok/s):          1551.16   
---------------Time to First Token----------------
Mean TTFT (ms):                          775.89    
Median TTFT (ms):                        775.89    
P99 TTFT (ms):                           775.89    
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          9.84      
Median TPOT (ms):                        9.84      
P99 TPOT (ms):                           9.84      
---------------Inter-token Latency----------------
Mean ITL (ms):                           9.74      
Median ITL (ms):                         9.73      
P99 ITL (ms):                            41.08     
================== Audio Result ==================
Total audio duration generated(s):       24.42     
Total audio frames generated:            586065    
Audio throughput(audio duration/s):      4.67      
---------------Time to First Packet---------------
Mean AUDIO_TTFP (ms):                    1492.09   
Median AUDIO_TTFP (ms):                  1492.09   
P99 AUDIO_TTFP (ms):                     1492.09   
-----------------Real Time Factor-----------------
Mean AUDIO_RTF:                          0.21      
Median AUDIO_RTF:                        0.21      
P99 AUDIO_RTF:                           0.21      
==================================================

After revert:

============ Serving Benchmark Result ============
Successful requests:                     1         
Failed requests:                         0         
Maximum request concurrency:             1         
Benchmark duration (s):                  5.43      
Request throughput (req/s):              0.18      
Peak concurrent requests:                1.00      
----------------End-to-end Latency----------------
Mean E2EL (ms):                          5425.66   
Median E2EL (ms):                        5425.66   
P99 E2EL (ms):                           5425.66   
================== Text Result ===================
Total input tokens:                      8014      
Total generated tokens:                  100       
Output token throughput (tok/s):         18.43     
Peak output token throughput (tok/s):    75.00     
Peak concurrent requests:                1.00      
Total Token throughput (tok/s):          1495.33   
---------------Time to First Token----------------
Mean TTFT (ms):                          748.53    
Median TTFT (ms):                        748.53    
P99 TTFT (ms):                           748.53    
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          9.72      
Median TPOT (ms):                        9.72      
P99 TPOT (ms):                           9.72      
---------------Inter-token Latency----------------
Mean ITL (ms):                           9.63      
Median ITL (ms):                         9.74      
P99 ITL (ms):                            49.61     
================== Audio Result ==================
Total audio duration generated(s):       25.70     
Total audio frames generated:            616785    
Audio throughput(audio duration/s):      4.74      
---------------Time to First Packet---------------
Mean AUDIO_TTFP (ms):                    1483.27   
Median AUDIO_TTFP (ms):                  1483.27   
P99 AUDIO_TTFP (ms):                     1483.27   
-----------------Real Time Factor-----------------
Mean AUDIO_RTF:                          0.21      
Median AUDIO_RTF:                        0.21      
P99 AUDIO_RTF:                           0.21      
==================================================

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan. Please provide the test scripts & test commands. Please state the reasons if your codes don't require additional test scripts. For test file guidelines, please check the test style doc
• The test results. Please paste the results comparison before and after, or the e2e results.
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model. Please run mkdocs serve to sync the documentation editions to ./docs.
• (Optional) Release notes update. If your change is user-facing, please update the release notes draft.

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[hsliuustc0106]

lgtm