Android引导图日志分析

Question

我正在使用bootchart工具来计算android启动时间。我有在启用bootchart后创建的bootchart日志，我无法使用命令“pybootchart gui bootchart.tgz”为其生成图形图表。当我试图生成图像时，我遇到了以下错误

parsing '/tmp/android-bootchart/bootchart.tgz'
parsing 'header'
parsing 'proc_stat.log'
parsing 'proc_ps.log'
warning: no parent for pid '2' with ppid '0'
parsing 'proc_diskstats.log'
merged 0 logger processes
pruned 120 process, 0 exploders, 1 threads, and 0 runs
False
Traceback (most recent call last):
  File "/usr/bin/pybootchartgui", line 23, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/dist-packages/pybootchartgui/main.py", line 137, in main
    render()
  File "/usr/lib/python2.7/dist-packages/pybootchartgui/main.py", line 128, in render
    batch.render(writer, res, options, filename)
  File "/usr/lib/python2.7/dist-packages/pybootchartgui/batch.py", line 41, in render
    draw.render(ctx, options, *res)
  File "/usr/lib/python2.7/dist-packages/pybootchartgui/draw.py", line 282, in render
    draw_chart(ctx, IO_COLOR, True, chart_rect, [(sample.time, sample.util) for sample in disk_stats], proc_tree)
  File "/usr/lib/python2.7/dist-packages/pybootchartgui/draw.py", line 201, in draw_chart
    yscale = float(chart_bounds[3]) / max(y for (x,y) in data)
ZeroDivisionError: float division by zero

我搜索了其他可以分析引导图表日志的实用程序，但没有找到。如何修复上述错误