98% physical memory utilized by cached

Hi All,
Every day multiple time physical memory utilized by cached. and only after manual clearing its releasing. Verified running process, but all process utilizing only 0.1/0.2 %Mem.

Can anyone help me to identify the issue.

Comments

  • Additional info

    free -g
    total used free shared buffers cached
    Mem: 47 46 0 0 0 42 -->> 42 GB physical mem used by cache
    -/+ buffers/cache: 3 43
    Swap: 1 0 1

    Server last rebooted 128 days back.

  • malcolmlewismalcolmlewis Knowledge Partner

    @Araind Hi and welcome to the Forum :)
    What release of SLES is this? cat /etc/os-release On SLES 15 SP1 I see in the last column available not cached, second to last is buff/cache.

  • Thank you for your response .

    Please see below details.

    cat /etc/os-release

    NAME="SLES"
    VERSION="11.4"
    VERSION_ID="11.4"
    PRETTY_NAME="SUSE Linux Enterprise Server 11 SP4"
    ID="sles"
    ANSI_COLOR="0;32"
    CPE_NAME="cpe:/o:suse:sles:11:4"

    +++++++++++++++++++++++
    After executing below command manually cached usage comedown to "0"

    sync; echo 1 > /proc/sys/vm/drop_caches

    ++++++

    Above operations we have done multiple times from past two days on Prod server to support App's team job to run.
    Current utilization as below

    free -g

                       total       used       free     shared    buffers     cached
    

    Mem: 47 13 33 0 0 8
    -/+ buffers/cache: 3 43
    Swap: 1 0 1

    Cached will occupy 48G in within short period and then App team can't execute any job.

    How to identify why it's filling up ?
    Any permanent fix we can apply ?

  • typo error
    Cached will occupy 46GB within short period of time and then App team can't execute any job.

  • malcolmlewismalcolmlewis Knowledge Partner

    @Araind Hi, I suggest opening a Support Request for this issue, mainly because it's an old release, hopefully you have LTSS support?

  • I have opened support request and they have give only workaround not permanent fix.
    Like add cronjob entry to drop cache ,.

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