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 >