在centos7里面1、编写监控程序读取磁盘监控文件/proc/diskstats，找出磁盘读的次数、写的次数，读字节数、磁盘写耗时；

以下是一个简单的Python监控程序，可以读取磁盘监控文件/proc/diskstats，并输出磁盘读写次数、读取字节数和磁盘写入时间：

import time

def get_disk_stats():
    stats = {}
    with open('/proc/diskstats', 'r') as f:
        for line in f:
            fields = line.strip().split()
            if fields[2].startswith('sd') or fields[2].startswith('vd'):
                stats[fields[2]] = {
                    'reads': int(fields[3]),
                    'writes': int(fields[7]),
                    'read_bytes': int(fields[5]) * 512,
                    'write_time': int(fields[9])
                }
    return stats

last_stats = get_disk_stats()

while True:
    time.sleep(1)
    current_stats = get_disk_stats()
    for device, stats in current_stats.items():
        last = last_stats.get(device)
        if last:
            read_count = stats['reads'] - last['reads']
            write_count = stats['writes'] - last['writes']
            read_bytes = stats['read_bytes'] - last['read_bytes']
            write_time = stats['write_time'] - last['write_time']
            print(f"{device}: Reads: {read_count}, Writes: {write_count}, Bytes Read: {read_bytes}, Write Time: {write_time}")
    last_stats = current_stats

该程序使用了Python的文件操作和时间模块来读取/proc/diskstats文件并计算磁盘读写次数、读取字节数和磁盘写入时间。程序使用了一个无限循环来定期获取最新的磁盘统计信息，并输出到控制台。可以使用Ctrl+C来停止程序运行。