linux性能关注-io
最近服务器有io的瓶颈，在查找资料的过程中，找到几遍好文章，分享一下。其中作者针对内核监控io的方法做了总结，又有脚本的支持。以及对监控数据的说明，很好。
如何查看进程 IO 读写情况？
监测 Linux 进程的实时 IO 情况
标记一下，Kernel < 2.6.20的python脚本
#!/usr/bin/python# Monitoring per-process disk I/O activity# written by http://www.vpsee.com import sys, os, time, signal, reclass DiskIO: def __init__(self, pname=None, pid=None, reads=0, writes=0): self.pname = pname self.pid = pid self.reads = 0 self.writes = 0def main(): argc = len(sys.argv) if argc != 1: print "usage: ./iotop" sys.exit(0) if os.getuid() != 0: print "must be run as root" sys.exit(0) signal.signal(signal.SIGINT, signal_handler) os.system('echo 1 > /proc/sys/vm/block_dump') print "TASK PID READ WRITE" while True: os.system('dmesg -c > /tmp/diskio.log') l = [] f = open('/tmp/diskio.log', 'r') line = f.readline() while line: m = re.match(\ '^(\S+)\((\d+)\): (READ|WRITE) block (\d+) on (\S+)', line) if m != None: if not l: l.append(DiskIO(m.group(1), m.group(2))) line = f.readline() continue found = False for item in l: if item.pid == m.group(2): found = True if m.group(3) == "READ": item.reads = item.reads + 1 elif m.group(3) == "WRITE": item.writes = item.writes + 1 if not found: l.append(DiskIO(m.group(1), m.group(2))) line = f.readline() time.sleep(1) for item in l: print "%-10s %10s %10d %10d" % \ (item.pname, item.pid, item.reads, item.writes)def signal_handler(signal, frame): os.system('echo 0 > /proc/sys/vm/block_dump') sys.exit(0)if __name__=="__main__": main()
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