Function plot_bytes_written_and_read

Plots the cumulative sum of the bytes written and read by the server. Args: sys_metrics: pd.DataFrame as written by writer.py. rolling_window: Number of previous rounds to consider in the cumulative sum. figsize: Size of the plot as specified by plt.figure(). tit

(sys_metrics, rolling_window=10, figsize=(10, 8), title_fontsize=16, **kwargs)