I use pidstat and find all processes on this server perform read operation. but I don't know where these read operation come from | | yf chu | | 邮箱：cyflhn at 163.com | 签名由 网易邮箱大师 定制 On 03/05/2021 23:03, Joshua Kramer wrote: Install a program called iotop. iotop will show you, in real time, which processes are using the most i/o bandwidth. On Fri, Mar 5, 2021 at 2:54 AM yf chu <cyflhn at 163.com> wrote: > > We have experienced a very weird problem. The load of the server machine is very high. We use "pidstat" and find that the disk read io is very high. > But the processes running on this server do not perform any disk read operation. > We also noticed that when we execute "top" command, for most of processes, the values in "SHR" column are zero. > Compared with other normal servers, we found that by executing "free -m", the result shows that the buff/cache value in this server is lower than the value of other normal servers. > We also found that there were lots of major page faults by executing "ps -o majflt,minflt". > Swap is not enabled on this server. What could be the reason for this issue? > > > The centos version:CentOS Linux release 7.3.1611 > kernel version:3.10.0-693.21.1.std7a.el7.0.x86_64 > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos