linux下抓出哪个进程造成的 iowait很高的方法

使用block_dump

抓哪个进程干坏事前要先停掉syslog

1. /etc/init.d/syslog stop
   
2. echo 1 > /proc/sys/vm/block_dump
   
3. sleep 60
   
4. dmesg | awk '/(READ|WRITE|dirtied)/ {process[$1]++} END {for (x in process) \
   
5. print process[x],x}' |sort -nr |awk '{print $2 " " $1}' | head -n 10
   
6. 
   
7. echo 0 > /proc/sys/vm/block_dump
8. /etc/init.d/syslog start