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sskj/experiments/dsv4_h200_64k_sglang_vs_vllm/run_bench.sh

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#!/usr/bin/env bash
# 64k-context SGLang vs vLLM comparison on H200.
set -Eeuo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
EXPERIMENT_NAME="$(basename "$SCRIPT_DIR")"
# shellcheck source=/dev/null
source "${SCRIPT_DIR}/../../scripts/common/lib.sh"
# shellcheck source=/dev/null
source "${SCRIPT_DIR}/../../scripts/common/platform.sh"
# shellcheck source=/dev/null
source "${SCRIPT_DIR}/config.env"
RUN_ID="${RUN_ID:-$(date '+%Y%m%d-%H%M%S')}"
RESULT_BASE="${SCRIPT_DIR}/results"
log_dir_global="${RESULT_BASE}/${RUN_ID}/logs"
mkdir -p "$log_dir_global"
log_init "${log_dir_global}/orchestrator.log"
log "experiment=${EXPERIMENT_NAME}"
log "run_id=${RUN_ID}"
log "platform=${PLATFORM}"
log "hardware=${HARDWARE}"
log "model=${MODEL_PATH}"
log "max_model_len=${MAX_MODEL_LEN}"
log "scenarios=${#SCENARIOS[@]}"
# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------
is_server_healthy() {
local port="$1"
curl --fail --silent --show-error --max-time 5 "http://127.0.0.1:${port}/health" >/dev/null 2>&1
}
stop_server() {
local backend="$1"
local pid_file="/data/user1/yy/dsv4_h200_64k_sglang_vs_vllm_${backend}.pid"
if [[ -f "$pid_file" ]]; then
local pid
pid="$(cat "$pid_file")"
if kill -0 "$pid" 2>/dev/null; then
log "stopping ${backend} server pid=${pid}"
kill "$pid" 2>/dev/null || true
sleep 5
kill -9 "$pid" 2>/dev/null || true
fi
rm -f "$pid_file"
fi
# Fallback cleanup.
if [[ "$backend" == "sglang" ]]; then
pkill -9 -f "sglang serve.*DeepSeek-V4-Flash" 2>/dev/null || true
else
pkill -9 -f "vllm serve.*DeepSeek-V4-Flash" 2>/dev/null || true
fi
sleep 2
}
start_server() {
local backend="$1"
local start_script
if [[ "$backend" == "sglang" ]]; then
start_script="${SGLANG_START_SCRIPT}"
local port="$SGLANG_PORT"
else
start_script="${VLLM_START_SCRIPT}"
local port="$VLLM_PORT"
fi
log "starting ${backend} server with ${start_script}"
bash "${start_script}" >> "${log_dir_global}/${backend}.server.outer.log" 2>&1
if ! is_server_healthy "$port"; then
log "error: ${backend} server failed to become healthy"
return 1
fi
log "${backend} server is healthy on port ${port}"
}
run_warmup() {
local backend="$1"
local port input_len output_len num
if [[ "$backend" == "sglang" ]]; then
port="$SGLANG_PORT"
else
port="$VLLM_PORT"
fi
# Warmup with a moderate 64k request to exercise the long-context path.
input_len=65536
output_len=256
num=1
log "warming up ${backend} (input=${input_len}, output=${output_len}, num=${num})"
"${VENV_CLIENT}/bin/python" "${SCRIPT_DIR}/../../scripts/common/warmup.py" \
--backend "$backend" \
--port "$port" \
--input-len "$input_len" \
--output-len "$output_len" \
--num "$num" \
--env-python "${VENV_CLIENT}/bin/python" \
>> "${log_dir_global}/${backend}.warmup.log" 2>&1
log "warmup for ${backend} completed"
}
scenario_already_completed() {
local output_file="$1"
local expected="$2"
[[ -s "$output_file" ]] || return 1
local completed
completed="$(${VENV_CLIENT}/bin/python -c "
import json, sys
path = sys.argv[1]
try:
with open(path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
if line:
data = json.loads(line)
print(data.get('completed', 0))
break
except Exception:
print(0)
" "$output_file")"
[[ "${completed:-0}" -ge "$expected" ]]
}
run_benchmark() {
local backend="$1"
local result_root="${RESULT_BASE}/${RUN_ID}/${backend}"
local raw_dir="${result_root}/raw_outputs"
local phase_log_dir="${result_root}/logs"
mkdir -p "$raw_dir" "$phase_log_dir"
local port
if [[ "$backend" == "sglang" ]]; then
port="$SGLANG_PORT"
else
port="$VLLM_PORT"
fi
log "===== ${backend} START (max_model_len=${MAX_MODEL_LEN}) ====="
stop_server "$backend"
start_server "$backend"
run_warmup "$backend"
for scenario in "${SCENARIOS[@]}"; do
read -r concurrency input_len output_len num_prompts <<< "$scenario"
output_file="${raw_dir}/${backend}_64k_$(date '+%m%d')_${concurrency}_${input_len}_${output_len}.jsonl"
detail_log="${phase_log_dir}/${backend}_64k_c${concurrency}_i${input_len}_o${output_len}.log"
if scenario_already_completed "$output_file" "$num_prompts"; then
log "skipping already-completed ${backend} scenario: c=${concurrency} i=${input_len} o=${output_len}"
continue
fi
log "running ${backend} scenario: c=${concurrency} i=${input_len} o=${output_len} n=${num_prompts}"
"${VENV_CLIENT}/bin/python" -m sglang.bench_serving \
--backend "$backend" \
--host 127.0.0.1 \
--port "$port" \
--dataset-name random \
--random-input-len "$input_len" \
--random-output-len "$output_len" \
--num-prompts "$num_prompts" \
--max-concurrency "$concurrency" \
--request-rate 10000 \
--output-file "$output_file" \
--output-details \
> "$detail_log" 2>&1 || {
log "ERROR: ${backend} scenario c=${concurrency} i=${input_len} o=${output_len} failed; see ${detail_log}"
continue
}
log "finished ${backend} scenario: output=${output_file}"
done
stop_server "$backend"
log "===== ${backend} DONE ====="
}
parse_backend() {
local backend="$1"
local result_root="${RESULT_BASE}/${RUN_ID}/${backend}"
log "parsing ${backend} results in ${result_root}"
"${VENV_CLIENT}/bin/python" "${SCRIPT_DIR}/../../scripts/common/parse_backend.py" "$result_root" --backend "$backend" \
>> "${result_root}/logs/parse.log" 2>&1 || {
log "WARNING: parser failed for ${backend}; see ${result_root}/logs/parse.log"
}
}
write_backend_metadata() {
local backend="$1"
local result_root="${RESULT_BASE}/${RUN_ID}/${backend}"
ensure_result_root "$result_root"
local meta_json="${result_root}/results.json"
local env_path
if [[ "$backend" == "sglang" ]]; then
env_path="$VENV_SGLANG"
else
env_path="$VENV_VLLM"
fi
# Capture the exact server launch args for reproducibility.
local server_args
if [[ "$backend" == "sglang" ]]; then
server_args="sglang serve --trust-remote-code --model-path $MODEL_PATH --tp $TP --moe-runner-backend marlin --context-length $MAX_MODEL_LEN --max-running-requests $MAX_RUNNING --mem-fraction-static 0.88 --host 0.0.0.0 --port $SGLANG_PORT"
else
server_args="vllm serve $MODEL_PATH --trust-remote-code --tensor-parallel-size $TP --kv-cache-dtype fp8 --max-model-len $MAX_MODEL_LEN --max-num-seqs $MAX_NUM_SEQS --block-size 256 --gpu-memory-utilization 0.90 --tokenizer-mode deepseek_v4 --reasoning-parser deepseek_v4 --no-disable-hybrid-kv-cache-manager --disable-uvicorn-access-log --port $VLLM_PORT"
fi
write_metadata_json \
"$meta_json" \
"${EXPERIMENT_NAME}_${backend}" \
"$RUN_ID" \
"$MODEL_PATH" \
"$backend" \
"$backend" \
"$HARDWARE" \
"$ACCELERATOR" \
"$CHIP" \
"experiments/${EXPERIMENT_NAME}/run_bench.sh" \
"$env_path" \
"H200 64k-context ${backend} TP=8 comparison for DeepSeek-V4-Flash"
# Embed config and server args.
jq --arg backend "$backend" \
--arg server_args "$server_args" \
'.config = {
"tp": 8,
"cuda_visible_devices": "0,1,2,3,4,5,6,7",
"max_model_len": 70000,
"backend": $backend,
"server_start_script": "experiments/dsv4_h200_64k_sglang_vs_vllm/start_\($backend).sh",
"server_args": $server_args
}' "$meta_json" > "${meta_json}.tmp" && mv "${meta_json}.tmp" "$meta_json"
}
# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------
# Cleanup any leftovers.
stop_server sglang
stop_server vllm
write_backend_metadata sglang
write_backend_metadata vllm
# Run SGLang.
run_benchmark sglang
parse_backend sglang
# Run vLLM.
run_benchmark vllm
parse_backend vllm
# Generate comparison.
log "generating comparison report"
"${VENV_CLIENT}/bin/python" "${SCRIPT_DIR}/../../scripts/common/compare.py" \
--sglang "${RESULT_BASE}/${RUN_ID}/sglang" \
--vllm "${RESULT_BASE}/${RUN_ID}/vllm" \
--output "${RESULT_BASE}/${RUN_ID}/comparison.md" \
>> "${log_dir_global}/compare.log" 2>&1 || {
log "WARNING: comparison script failed; see ${log_dir_global}/compare.log"
}
log "all results saved to ${RESULT_BASE}/${RUN_ID}"
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