[Doc]Add benchmark scripts (#74)

### What this PR does / why we need it?
The purpose of this PR is to add benchmark scripts for npu, developers
can easily run performance tests on their own machines with one line of
code .


---------

Signed-off-by: wangli <wangli858794774@gmail.com>

benchmarks/README.md

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+# Introduction
+This document outlines the benchmarking process for vllm-ascend, designed to evaluate its performance under various workloads. The primary goal is to help developers assess whether their pull requests improve or degrade vllm-ascend's performance.To maintain consistency with the vllm community, we have reused the vllm community [benchmark](https://github.com/vllm-project/vllm/tree/main/benchmarks) script.
+# Overview
+**Benchmarking Coverage**: We measure latency, throughput, and fixed-QPS serving on the Atlas800I A2 (see [quick_start](../docs/source/quick_start.md) to learn more supported devices list), with different models(coming soon).
+- Latency tests
+    - Input length: 32 tokens.
+    - Output length: 128 tokens.
+    - Batch size: fixed (8).
+    - Models: llama-3.1 8B.
+    - Evaluation metrics: end-to-end latency (mean, median, p99).
+
+- Throughput tests
+    - Input length: randomly sample 200 prompts from ShareGPT dataset (with fixed random seed).
+    - Output length: the corresponding output length of these 200 prompts.
+    - Batch size: dynamically determined by vllm to achieve maximum throughput.
+    - Models: llama-3.1 8B .
+    - Evaluation metrics: throughput.
+- Serving tests
+    - Input length: randomly sample 200 prompts from ShareGPT dataset (with fixed random seed).
+    - Output length: the corresponding output length of these 200 prompts.
+    - Batch size: dynamically determined by vllm and the arrival pattern of the requests.
+    - **Average QPS (query per second)**: 1, 4, 16 and inf. QPS = inf means all requests come at once. For other QPS values, the arrival time of each query is determined using a random Poisson process (with fixed random seed).
+    - Models: llama-3.1 8B.
+    - Evaluation metrics: throughput, TTFT (time to the first token, with mean, median and p99), ITL (inter-token latency, with mean, median and p99).
+
+**Benchmarking Duration**: about 800senond for single model.
+
+
+# Quick Use
+## Prerequisites
+Before running the benchmarks, ensure the following:
+- vllm and vllm-ascend are installed and properly set up in an NPU environment, as these scripts are specifically designed for NPU devices.
+- Install necessary dependencies for benchmarks:
+    ```
+    pip install -r benchmarks/requirements-bench.txt
+    ```
+    
+- Models and datasets are cached locally to accelerate execution. Modify the paths in the JSON files located in benchmarks/tests accordingly. feel free to add your own models and parameters in the JSON to run your customized benchmarks.
+
+## Run benchmarks
+The provided scripts automatically execute performance tests for serving, throughput, and latency. To start the benchmarking process, run command in the vllm-ascend root directory:
+```
+bash benchmarks/scripts/run-performance-benchmarks.sh
+```
+Once the script completes, you can find the results in the benchmarks/results folder. The output files may resemble the following:
+```
+|-- latency_llama8B_tp1.json
+|-- serving_llama8B_tp1_sharegpt_qps_1.json
+|-- serving_llama8B_tp1_sharegpt_qps_16.json
+|-- serving_llama8B_tp1_sharegpt_qps_4.json
+|-- serving_llama8B_tp1_sharegpt_qps_inf.json
+|-- throughput_llama8B_tp1.json
+```
+These files contain detailed benchmarking results for further analysis.

benchmarks/requirements-bench.txt

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+pandas
+datasets

benchmarks/scripts/run-performance-benchmarks.sh

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+#!/bin/bash
+
+
+check_npus() {
+  # shellcheck disable=SC2155
+  declare -g npu_count=$(npu-smi info -l | grep "Total Count" | awk -F ':' '{print $2}' | tr -d ' ')
+  
+  if [[ -z "$npu_count" || "$npu_count" -eq 0 ]]; then
+    echo "Need at least 1 NPU to run benchmarking."
+    exit 1
+  else
+    echo "found NPU conut: $npu_count"
+  fi
+
+  npu_type=$(npu-smi info | grep -E "^\| [0-9]+" | awk -F '|' '{print $2}' | awk '{$1=$1;print}' | awk '{print $2}')
+
+  echo "NPU type is: $npu_type"
+}
+
+ensure_sharegpt_downloaded() {
+  local FILE=ShareGPT_V3_unfiltered_cleaned_split.json
+  if [ ! -f "$FILE" ]; then
+    echo "$FILE not found, downloading from hf-mirror ..."
+    wget https://hf-mirror.com/datasets/anon8231489123/ShareGPT_Vicuna_unfiltered/resolve/main/$FILE
+  else
+    echo "$FILE already exists."
+  fi
+}
+
+json2args() {
+  # transforms the JSON string to command line args, and '_' is replaced to '-'
+  # example:
+  # input: { "model": "meta-llama/Llama-2-7b-chat-hf", "tensor_parallel_size": 1 }
+  # output: --model meta-llama/Llama-2-7b-chat-hf --tensor-parallel-size 1
+  local json_string=$1
+  local args
+  args=$(
+    echo "$json_string" | jq -r '
+      to_entries |
+      map("--" + (.key | gsub("_"; "-")) + " " + (.value | tostring)) |
+      join(" ")
+    '
+  )
+  echo "$args"
+}
+
+wait_for_server() {
+  # wait for vllm server to start
+  # return 1 if vllm server crashes
+  timeout 1200 bash -c '
+    until curl -X POST localhost:8000/v1/completions; do
+      sleep 1
+    done' && return 0 || return 1
+}
+
+get_cur_npu_id() {
+    npu-smi info -l | awk -F ':' '/NPU ID/ {print $2+0; exit}'
+}
+
+kill_npu_processes() {
+  ps -aux
+  lsof -t -i:8000 | xargs -r kill -9
+  pgrep python3 | xargs -r kill -9
+  
+  sleep 4
+  rm -rf ~/.config/vllm
+
+}
+
+
+run_latency_tests() {
+  # run latency tests using `benchmark_latency.py`
+  # $1: a json file specifying latency test cases
+
+  local latency_test_file
+  latency_test_file=$1
+
+  # Iterate over latency tests
+  jq -c '.[]' "$latency_test_file" | while read -r params; do
+    # get the test name, and append the NPU type back to it.
+    test_name=$(echo "$params" | jq -r '.test_name')
+    if [[ ! "$test_name" =~ ^latency_ ]]; then
+      echo "In latency-test.json, test_name must start with \"latency_\"."
+      exit 1
+    fi
+
+    # if TEST_SELECTOR is set, only run the test cases that match the selector
+    if [[ -n "$TEST_SELECTOR" ]] && [[ ! "$test_name" =~ $TEST_SELECTOR ]]; then
+      echo "Skip test case $test_name."
+      continue
+    fi
+
+    # get arguments
+    latency_params=$(echo "$params" | jq -r '.parameters')
+    latency_args=$(json2args "$latency_params")
+
+    latency_command="python3 vllm_benchmarks/benchmark_latency.py \
+      --output-json $RESULTS_FOLDER/${test_name}.json \
+      $latency_args"
+
+    echo "Running test case $test_name"
+    echo "Latency command: $latency_command"
+
+    # run the benchmark
+    eval "$latency_command"
+
+    kill_npu_processes
+
+  done
+}
+
+run_throughput_tests() {
+  # run throughput tests using `benchmark_throughput.py`
+  # $1: a json file specifying throughput test cases
+
+  local throughput_test_file
+  throughput_test_file=$1
+
+  # Iterate over throughput tests
+  jq -c '.[]' "$throughput_test_file" | while read -r params; do
+    # get the test name, and append the NPU type back to it.
+    test_name=$(echo "$params" | jq -r '.test_name')
+    if [[ ! "$test_name" =~ ^throughput_ ]]; then
+      echo "In throughput-test.json, test_name must start with \"throughput_\"."
+      exit 1
+    fi
+
+    # if TEST_SELECTOR is set, only run the test cases that match the selector
+    if [[ -n "$TEST_SELECTOR" ]] && [[ ! "$test_name" =~ $TEST_SELECTOR ]]; then
+      echo "Skip test case $test_name."
+      continue
+    fi
+
+    # get arguments
+    throughput_params=$(echo "$params" | jq -r '.parameters')
+    throughput_args=$(json2args "$throughput_params")
+
+    throughput_command="python3 vllm_benchmarks/benchmark_throughput.py \
+      --output-json $RESULTS_FOLDER/${test_name}.json \
+      $throughput_args"
+
+    echo "Running test case $test_name"
+    echo "Throughput command: $throughput_command"
+
+    # run the benchmark
+    eval "$throughput_command"
+
+    kill_npu_processes
+
+  done
+}
+
+run_serving_tests() {
+  # run serving tests using `benchmark_serving.py`
+  # $1: a json file specifying serving test cases
+
+  local serving_test_file
+  serving_test_file=$1
+
+  # Iterate over serving tests
+  jq -c '.[]' "$serving_test_file" | while read -r params; do
+    # get the test name, and append the NPU type back to it.
+    test_name=$(echo "$params" | jq -r '.test_name')
+    if [[ ! "$test_name" =~ ^serving_ ]]; then
+      echo "In serving-test.json, test_name must start with \"serving_\"."
+      exit 1
+    fi
+
+    # if TEST_SELECTOR is set, only run the test cases that match the selector
+    if [[ -n "$TEST_SELECTOR" ]] && [[ ! "$test_name" =~ $TEST_SELECTOR ]]; then
+      echo "Skip test case $test_name."
+      continue
+    fi
+
+    # get client and server arguments
+    server_params=$(echo "$params" | jq -r '.server_parameters')
+    client_params=$(echo "$params" | jq -r '.client_parameters')
+    server_args=$(json2args "$server_params")
+    client_args=$(json2args "$client_params")
+    qps_list=$(echo "$params" | jq -r '.qps_list')
+    qps_list=$(echo "$qps_list" | jq -r '.[] | @sh')
+    echo "Running over qps list $qps_list"
+
+    # check if server model and client model is aligned
+    server_model=$(echo "$server_params" | jq -r '.model')
+    client_model=$(echo "$client_params" | jq -r '.model')
+    if [[ $server_model != "$client_model" ]]; then
+      echo "Server model and client model must be the same. Skip testcase $test_name."
+      continue
+    fi
+
+    server_command="python3 \
+      -m vllm.entrypoints.openai.api_server \
+      $server_args"
+
+    # run the server
+    echo "Running test case $test_name"
+    echo "Server command: $server_command"
+    bash -c "$server_command" &
+    server_pid=$!
+
+    # wait until the server is alive
+    if wait_for_server; then
+      echo ""
+      echo "vllm server is up and running."
+    else
+      echo ""
+      echo "vllm failed to start within the timeout period."
+    fi
+
+    # iterate over different QPS
+    for qps in $qps_list; do
+      # remove the surrounding single quote from qps
+      if [[ "$qps" == *"inf"* ]]; then
+        echo "qps was $qps"
+        qps="inf"
+        echo "now qps is $qps"
+      fi
+
+      new_test_name=$test_name"_qps_"$qps
+
+      client_command="python3 vllm_benchmarks/benchmark_serving.py \
+        --save-result \
+        --result-dir $RESULTS_FOLDER \
+        --result-filename ${new_test_name}.json \
+        --request-rate $qps \
+        $client_args"
+
+      echo "Running test case $test_name with qps $qps"
+      echo "Client command: $client_command"
+
+      bash -c "$client_command"
+    done
+
+    # clean up
+    kill -9 $server_pid
+    kill_npu_processes
+  done
+}
+
+cleanup() {
+  rm -rf ./vllm_benchmarks
+}
+
+get_benchmarks_scripts() {
+  git clone -b main --depth=1 git@github.com:vllm-project/vllm.git && \
+  mv vllm/benchmarks vllm_benchmarks
+  rm -rf ./vllm
+}
+
+main() {
+
+  START_TIME=$(date +%s)
+  check_npus
+
+  # dependencies
+  (which wget && which curl) || (apt-get update && apt-get install -y wget curl)
+  (which jq) || (apt-get update && apt-get -y install jq)
+  (which lsof) || (apt-get update && apt-get install -y lsof)
+
+  # get the current IP address, required by benchmark_serving.py
+  # shellcheck disable=SC2155
+  export VLLM_HOST_IP=$(hostname -I | awk '{print $1}')
+  # turn of the reporting of the status of each request, to clean up the terminal output
+  export VLLM_LOG_LEVEL="WARNING"
+
+  # prepare for benchmarking
+  cd benchmarks || exit 1
+  get_benchmarks_scripts
+  trap cleanup EXIT
+
+  QUICK_BENCHMARK_ROOT=./
+
+  declare -g RESULTS_FOLDER=results
+  mkdir -p $RESULTS_FOLDER
+
+  ensure_sharegpt_downloaded
+  # benchmarks
+  run_serving_tests $QUICK_BENCHMARK_ROOT/tests/serving-tests.json
+  run_latency_tests $QUICK_BENCHMARK_ROOT/tests/latency-tests.json
+  run_throughput_tests $QUICK_BENCHMARK_ROOT/tests/throughput-tests.json
+
+  END_TIME=$(date +%s)
+  ELAPSED_TIME=$((END_TIME - START_TIME))
+  echo "Total execution time: $ELAPSED_TIME seconds"
+
+}
+
+main "$@"

benchmarks/tests/latency-tests.json

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+[
+  {
+    "test_name": "latency_llama8B_tp1",
+    "parameters": {
+      "model": "meta-llama/Llama-3.1-8B-Instruct",
+      "tensor_parallel_size": 1,
+      "load_format": "dummy",
+      "num_iters_warmup": 5,
+      "num_iters": 15
+    }
+  }
+]

benchmarks/tests/serving-tests.json

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+[
+  {
+    "test_name": "serving_llama8B_tp1",
+    "qps_list": [
+      1,
+      4,
+      16,
+      "inf"
+    ],
+    "server_parameters": {
+      "model": "meta-llama/Llama-3.1-8B-Instruct",
+      "tensor_parallel_size": 1,
+      "swap_space": 16,
+      "disable_log_stats": "",
+      "disable_log_requests": "",
+      "load_format": "dummy"
+    },
+    "client_parameters": {
+      "model": "meta-llama/Llama-3.1-8B-Instruct",
+      "backend": "vllm",
+      "dataset_name": "sharegpt",
+      "dataset_path": "./ShareGPT_V3_unfiltered_cleaned_split.json",
+      "num_prompts": 200
+    }
+  }
+]

benchmarks/tests/throughput-tests.json

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+[
+  {
+    "test_name": "throughput_llama8B_tp1",
+    "parameters": {
+      "model": "meta-llama/Llama-3.1-8B-Instruct",
+      "tensor_parallel_size": 1,
+      "load_format": "dummy",
+      "dataset_path": "./ShareGPT_V3_unfiltered_cleaned_split.json",
+      "num_prompts": 200,
+      "backend": "vllm"
+    }
+  }
+]
+