Raise error for data-parallel with benchmark_throughput

[kartikx]

Running benchmark_throughput with data parallel results in a hang. This PR raises an error if --data-parallel-size is passed in.

Based on discussions in #16222

This is my first PR to vLLM so please let me know if I should add any tests. Thanks!

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[kartikx]

@simon-mo @youkaichao Could I please get an auto-merge on this PR? Thank you.

[Potabk]

I encountered a problem when running this script， AttributeError: 'Namespace' object has no attribute 'data_parallel_size'. Did you mean: 'tensor_parallel_size'?, I think the command line parameter is not defined --data-parallel-size ,do we need add extra kwargs?

[kartikx]

@Potabk What version of vLLM are you using?

[Potabk]

@Potabk What version of vLLM are you using?

The latest benchmark script

[kartikx]

I was referring to the version of vLLM you have installed. You can check this via pip show vllm.

[Potabk]

I was referring to the version of vLLM you have installed. You can check this via pip show vllm.

Ok, never mind it, I think it is the inappropriate version, the latest version of vllm is ok