the processes on this server do not involve io read operation. the code is developed by ourself. so I don't know where these io read come from.
by the way, pidstat only show disk io ,not network io, is that right?
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yf chu
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On 03/05/2021 16:33, Simon Matter wrote:
Hi,
> 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.
If disk read IO is very high, what does it read and what generates the reads?
Simon
> 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
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