The applications on all those servers are same. They are working on same data. I still don't know why the size of buff/cache is different between different servers. At 2021-03-12 16:35:09, "Simon Matter" <simon.matter at invoca.ch> wrote: >Hi, > >You said that you have multiple systems running this same application. >But, do they work with the same data on disk or are there big differences? > >From how I understand the figures below, your buff/cache seems a bit low >if you read a lot of data from disk. If you read a lot of data and >filesystem caches are slow, it will result in heavy reading from disk >directly. > >One more thing comes to mind: is your hardware behaving fine? I mean, if >your storag has difficulties to read data from disk due to hardware >issues, this could also lead to such problems you're facing. > >Regards, >Simon > >> >> yes. I suspect it has something to do with swapping. but swap is turned >> off on this server. >> here is the result of free -m. >> total used free shared buff/cache available >> Mem: 128174 97449 24400 4158 6325 >> 25232 >> Swap: 0 0 0 >> >> >> We have other servers. The processes running on these servers are same. >> but on other servers, the size of buff/cache is larger than the size on >> the server which experienced the problem and the size of "free" is smaller >> than the size on the server which experienced the problem. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> �� 2021-03-10 14:30:00��"Thomas Stephen Lee" <lee.iitb at gmail.com> д���� >>>On Sat, Mar 6, 2021 at 6:37 AM yf chu <cyflhn at 163.com> wrote: >>>> >>>> no, not vm >>>> >>>> >>>> >>>> >>>> | | >>>> yf chu >>>> | >>>> | >>>> ���䣺cyflhn at 163.com >>>> | >>>> >>>> ǩ���� ���������ʦ ���� >>>> >>>> On 03/05/2021 23:37, Matthew Miller wrote: >>>> On Fri, Mar 05, 2021 at 03:54:14PM +0800, yf chu 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. >>>> >>>> Is this system a VM? >>>> >>>> -- >>>> Matthew Miller >>>> <mattdm at fedoraproject.org> >>>> Fedora Project Leader >>> >>>Hi, >>> >>>Is this due to swapping? >>> >>>what is the output of >>> >>>free -m >>> >>>--- >>>Lee >>>_______________________________________________ >>>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 >> > > >_______________________________________________ >CentOS mailing list >CentOS at centos.org >https://lists.centos.org/mailman/listinfo/centos