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[Misc] improve error msg #20604

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Merged
merged 1 commit into from
Jul 8, 2025
Merged

[Misc] improve error msg #20604

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9 changes: 6 additions & 3 deletions vllm/entrypoints/cli/serve.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,8 +46,10 @@ def cmd(args: argparse.Namespace) -> None:
run_headless(args)
else:
if args.data_parallel_start_rank:
raise ValueError("data_parallel_start_rank is only "
"applicable in headless mode")
raise ValueError(
"data_parallel_start_rank is only applicable "
"in headless mode. "
"Add --headless flag to enable headless mode.")
if args.api_server_count > 1:
run_multi_api_server(args)
else:
Expand Down Expand Up @@ -81,7 +83,8 @@ def subparser_init(
'-dpr',
type=int,
default=0,
help='Starting data parallel rank for secondary nodes.')
help="Starting data parallel rank for secondary nodes. "
"Requires --headless.")
serve_parser.add_argument('--api-server-count',
'-asc',
type=int,
Expand Down