feat: support custom task runner (#2407)

.github/workflows/experiment-runner.yml

+name: Experiment Runner
+
+on:
+  workflow_dispatch:
+
+concurrency:
+  group: experiment-runner-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  experiment-runner-1-gpu:
+    if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
+    runs-on: 1-gpu-runner
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install dependencies
+        run: |
+          bash scripts/ci_install_dependency.sh
+
+      - name: Test experiment runner
+        timeout-minutes: 10
+        run: |
+          cd test/srt
+          python3 experiment_runner.py --config configs/sharegpt_config.yaml

test/srt/configs/sharegpt_config.yaml

+tasks:
+  - name: sglang-benchmark
+    server_cmd: python3 -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disable-radix-cache
+    client_cmd: python3 -m sglang.bench_serving --backend sglang --dataset-name sharegpt --request-rate 16
+  - name: vllm-benchmark
+    server_cmd: python3 -m vllm.entrypoints.openai.api_server --model meta-llama/Llama-3.1-8B-Instruct --disable-log-requests
+    client_cmd: python3 -m sglang.bench_serving --backend vllm --dataset-name sharegpt --request-rate 16

test/srt/experiment_runner.py

+import argparse
+import logging
+import os
+import queue
+import re
+import subprocess
+import threading
+import time
+from dataclasses import dataclass
+from datetime import datetime
+from pathlib import Path
+from typing import Dict, List, Optional, Tuple
+
+import psutil
+import requests
+import yaml
+
+
+@dataclass
+class ServerConfig:
+    command: str
+    process_names: List[str]
+    default_port: int
+
+
+@dataclass
+class TaskConfig:
+    server_cmd: str
+    client_cmd: str
+    name: Optional[str] = None
+    server_type: Optional[str] = None
+
+
+@dataclass
+class TaskResult:
+    name: str
+    success: bool
+    output: str
+    runtime: float
+    timestamp: str
+
+
+SERVER_DEFAULTS = {
+    "sglang": ServerConfig(
+        command="sglang.launch_server",
+        process_names=["sglang.launch_server"],
+        default_port=30000,
+    ),
+    "vllm": ServerConfig(
+        command="vllm.entrypoints.openai.api_server",
+        process_names=["vllm.entrypoints.openai.api_server"],
+        default_port=8000,
+    ),
+}
+
+
+def parse_key_info(output: str) -> str:
+    """Extract and format key information from the output"""
+    key_info = []
+
+    # Extract Args namespace
+    args_match = re.search(r"Namespace\(.*?\)", output, re.DOTALL)
+    if args_match:
+        key_info.append(args_match.group(0))
+
+    # Extract input/output token counts
+    token_matches = re.findall(r"#(Input|Output) tokens: \d+", output)
+    key_info.extend(token_matches)
+
+    # Extract benchmark result section
+    result_match = re.search(
+        r"============ Serving Benchmark Result ============.*?={50,}",
+        output,
+        re.DOTALL,
+    )
+    if result_match:
+        key_info.append(result_match.group(0))
+
+    return "\n\n".join(key_info)
+
+
+def extract_port_from_command(cmd: str, server_type: str) -> int:
+    port_match = re.search(r"--port[= ](\d+)", cmd)
+    if port_match:
+        return int(port_match.group(1))
+    return SERVER_DEFAULTS.get(server_type, ServerConfig("", [], 8000)).default_port
+
+
+def detect_server_type(cmd: str) -> str:
+    for server_type, config in SERVER_DEFAULTS.items():
+        if config.command in cmd:
+            return server_type
+    return "unknown"
+
+
+def stream_output(
+    process: subprocess.Popen, prefix: str, logger: logging.Logger
+) -> queue.Queue:
+    output_queue = queue.Queue()
+
+    def stream_pipe(pipe, prefix):
+        for line in iter(pipe.readline, ""):
+            if prefix == "CLIENT":
+                output_queue.put(line.rstrip())
+            logger.debug(f"{prefix} | {line.rstrip()}")
+
+    stdout_thread = threading.Thread(
+        target=stream_pipe, args=(process.stdout, prefix), daemon=True
+    )
+    stderr_thread = threading.Thread(
+        target=stream_pipe, args=(process.stderr, prefix), daemon=True
+    )
+
+    stdout_thread.start()
+    stderr_thread.start()
+    return output_queue, (stdout_thread, stderr_thread)
+
+
+class ProcessManager:
+    def __init__(self):
+        self.server_process: Optional[subprocess.Popen] = None
+        self.client_process: Optional[subprocess.Popen] = None
+        self.logger = logging.getLogger(__name__)
+
+    def start_process(
+        self, command: str, prefix: str
+    ) -> Tuple[subprocess.Popen, queue.Queue]:
+        process = subprocess.Popen(
+            command,
+            shell=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            bufsize=1,
+        )
+
+        output_queue, threads = stream_output(process, prefix, self.logger)
+        return process, output_queue, threads
+
+    def kill_process_tree(self, process: subprocess.Popen):
+        try:
+            parent = psutil.Process(process.pid)
+            children = parent.children(recursive=True)
+
+            for child in children:
+                try:
+                    child.kill()
+                except psutil.NoSuchProcess:
+                    pass
+
+            parent.kill()
+            gone, alive = psutil.wait_procs(children + [parent], timeout=3)
+
+            for p in alive:
+                try:
+                    p.kill()
+                except psutil.NoSuchProcess:
+                    pass
+
+        except psutil.NoSuchProcess:
+            pass
+
+    def cleanup(self, process_names: List[str]):
+        if self.client_process:
+            self.kill_process_tree(self.client_process)
+            self.client_process = None
+
+        if self.server_process:
+            self.kill_process_tree(self.server_process)
+            self.server_process = None
+
+        for proc in psutil.process_iter(["pid", "name", "cmdline"]):
+            try:
+                cmdline = " ".join(proc.cmdline())
+                if any(name in cmdline for name in process_names):
+                    proc.kill()
+            except (psutil.NoSuchProcess, psutil.AccessDenied):
+                continue
+
+
+class ExperimentRunner:
+    def __init__(self):
+        self.process_manager = ProcessManager()
+        self.logger = logging.getLogger(__name__)
+
+    def wait_for_server(self, port: int, timeout: int = 300) -> bool:
+        start_time = time.time()
+
+        while time.time() - start_time < timeout:
+            try:
+                response = requests.get(f"http://localhost:{port}/health")
+                if response.status_code == 200:
+                    self.logger.debug(f"Server ready on port {port}")
+                    return True
+            except requests.RequestException:
+                time.sleep(2)
+        return False
+
+    def run_task(self, config: TaskConfig) -> TaskResult:
+        start_time = time.time()
+        client_output = []
+
+        try:
+            if not config.server_type:
+                config.server_type = detect_server_type(config.server_cmd)
+
+            server_config = SERVER_DEFAULTS.get(config.server_type)
+            if not server_config:
+                raise ValueError(f"Unknown server type: {config.server_type}")
+
+            port = extract_port_from_command(config.server_cmd, config.server_type)
+
+            self.process_manager.cleanup(server_config.process_names)
+
+            self.logger.debug(f"Starting server: {config.name}")
+            self.process_manager.server_process, _, server_threads = (
+                self.process_manager.start_process(config.server_cmd, "SERVER")
+            )
+
+            if not self.wait_for_server(port):
+                raise TimeoutError("Server startup timeout")
+
+            time.sleep(10)
+
+            self.logger.debug("Starting client")
+            self.process_manager.client_process, output_queue, client_threads = (
+                self.process_manager.start_process(config.client_cmd, "CLIENT")
+            )
+
+            returncode = self.process_manager.client_process.wait()
+
+            while True:
+                try:
+                    line = output_queue.get_nowait()
+                    client_output.append(line)
+                except queue.Empty:
+                    break
+
+            if returncode != 0:
+                raise RuntimeError(f"Client failed with code {returncode}")
+
+            # Parse and format the output
+            full_output = "\n".join(client_output)
+            formatted_output = parse_key_info(full_output)
+
+            return TaskResult(
+                name=config.name,
+                success=True,
+                output=formatted_output,
+                runtime=time.time() - start_time,
+                timestamp=datetime.now().isoformat(),
+            )
+
+        except Exception as e:
+            return TaskResult(
+                name=config.name,
+                success=False,
+                output=str(e),
+                runtime=time.time() - start_time,
+                timestamp=datetime.now().isoformat(),
+            )
+
+        finally:
+            if config.server_type in SERVER_DEFAULTS:
+                self.process_manager.cleanup(
+                    SERVER_DEFAULTS[config.server_type].process_names
+                )
+            time.sleep(10)
+
+
+def load_config(config_path: str) -> List[TaskConfig]:
+    with open(config_path, "r") as f:
+        config_data = yaml.safe_load(f)
+
+    configs = []
+    for idx, entry in enumerate(config_data.get("tasks", [])):
+        if not isinstance(entry, dict):
+            raise ValueError(f"Invalid entry at index {idx}")
+
+        config = TaskConfig(
+            server_cmd=entry.get("server_cmd"),
+            client_cmd=entry.get("client_cmd"),
+            name=entry.get("name", f"task-{idx+1}"),
+            server_type=entry.get("server_type"),
+        )
+
+        if not config.server_cmd or not config.client_cmd:
+            raise ValueError(f"Missing commands in {config.name}")
+
+        configs.append(config)
+
+    return configs
+
+
+def setup_logging(debug: bool = False):
+    level = logging.DEBUG if debug else logging.INFO
+    logging.basicConfig(
+        level=level,
+        format="%(asctime)s - %(levelname)s - %(message)s",
+        handlers=[logging.StreamHandler(), logging.FileHandler("experiment.log")],
+    )
+
+
+def format_results(results: List[TaskResult]) -> str:
+    """Format experiment results in Markdown for GitHub step summary."""
+    output = ["# Experiment Results\n"]
+
+    for result in results:
+        output.append(f"## {result.name}")
+        output.append(f"**Status**: {'✅ Success' if result.success else '❌ Failed'}")
+        output.append(f"**Runtime**: {result.runtime:.2f} seconds")
+        output.append(f"**Timestamp**: {result.timestamp}")
+        output.append("\n**Output**:\n```")
+        output.append(result.output)
+        output.append("```\n")
+
+    return "\n".join(output)
+
+
+def write_in_github_step_summary(results: List[TaskResult]):
+    """Write formatted results to GitHub step summary."""
+    if not os.environ.get("GITHUB_STEP_SUMMARY"):
+        logging.warning("GITHUB_STEP_SUMMARY environment variable not set")
+        return
+
+    formatted_content = format_results(results)
+    with open(os.environ["GITHUB_STEP_SUMMARY"], "a") as f:
+        f.write(formatted_content)
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Experiment Runner")
+    parser.add_argument(
+        "--config", type=str, required=True, help="Path to YAML config file"
+    )
+    parser.add_argument("--debug", action="store_true", help="Enable debug output")
+    args = parser.parse_args()
+
+    setup_logging(args.debug)
+    logger = logging.getLogger(__name__)
+    results = []
+
+    try:
+        configs = load_config(args.config)
+        runner = ExperimentRunner()
+
+        for config in configs:
+            logger.info(f"Running {config.name}")
+            result = runner.run_task(config)
+            results.append(result)
+
+        write_in_github_step_summary(results)
+    except Exception as e:
+        logger.error(f"Error: {e}")
+        raise
+
+
+if __name__ == "__main__":
+    main()