評估某個 function 的 usage

measureUsage.ts

  /**
   * usage measureResourceUsage(async()=>{}, logger, label)
   * @param func
   * @param logger
   * @param label
   * @private
   */
  async measureUsage<T>(
    func: () => Promise<T>,
    logger: Logger,
    label: string,
  ): Promise<T> {
    const startTime = process.hrtime();
    const startMemory = process.memoryUsage();
    const startCpuUsage = process.cpuUsage();

    const result = await func();

    const endTime = process.hrtime(startTime);
    const endMemory = process.memoryUsage();
    const endCpuUsage = process.cpuUsage(startCpuUsage);

    const timeTaken = endTime[0] + endTime[1] / 1e9;
    const memoryUsed = endMemory.heapUsed - startMemory.heapUsed;
    const cpuTime = (endCpuUsage.user + endCpuUsage.system) / 1e6;

    logger.log(`${label} took ${timeTaken.toFixed(3)} seconds`);
    logger.log(`Memory used: ${(memoryUsed / 1024 / 1024).toFixed(2)} MB`);
    logger.log(`CPU time: ${cpuTime.toFixed(2)} ms`);

    return result;
  }