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Thread: imperfect clearing of memory cache

  1. #11
    Join Date
    Aug 2011
    Location
    51.8° N 5.8° E
    Beans
    3,990
    Distro
    Xubuntu 18.04 Bionic Beaver

    Re: imperfect clearing of memory cache

    It seems your unreclaimable slab is excessively large. For comparison on my computer:
    Code:
    $ cat /proc/meminfo
    MemTotal:        8105308 kB
    MemFree:         3333608 kB
    MemAvailable:    4583560 kB
    Buffers:          166308 kB
    Cached:          1767816 kB
    (...)
    Slab:             147812 kB
    SReclaimable:     108240 kB
    SUnreclaim:        39572 kB
    (...)
    Slab is for in-kernel data structures. As I said, I don't know the details of memory management. Do you, by any chance, use a non-standard kernel? Although you quoted 4.4.0-101-generic, which seems to be the standard on 16.04 and 14.04 with HWE. I imagine there might be a small memory leak in the kernel (but that should have been discovered) or some driver, but I don't feel capable providing more help with that.

    And any particular reason to keep your computer running very slowly for a couple of days more instead of a simple reboot?

  2. #12
    Join Date
    Oct 2010
    Beans
    33

    Re: imperfect clearing of memory cache

    Quote Originally Posted by mirzman View Post

    Code:
    root@mirzman-workstation:~# ps --sort -rss -eo pid,pmem,rss,vsz,comm | head -20
      PID %MEM   RSS    VSZ COMMAND
     7392  5.7 939048 2968784 Web Content
     7164  4.4 720768 3052668 Web Content
     7121  4.3 713492 2926076 Web Content
    ... ...
    What is "Web Content" here? Do you use it a lot or just occasionally? What is it running for?
    You can try killing "Web Content" and then run again the command:
    Code:
    free && sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" && free
    You can run this command as non-root user then enter the password for root when it's required.
    What if we could adjust the clock, making a day of a virtual AI world much shorter than ours?
    What if a virtual AI being could spend its whole long life in a blink of our eyes?

  3. #13
    Join Date
    Dec 2007
    Beans
    12,540

    Re: imperfect clearing of memory cache

    Quote Originally Posted by photonxp View Post
    What is "Web Content" here? ...
    It originates from Firefox.

  4. #14
    Join Date
    Dec 2011
    Beans
    11

    Re: imperfect clearing of memory cache

    It died
    I tried echo 10000000 >/proc/sys/vm/min_free_kbytes
    The result will be several days later

  5. #15
    Join Date
    Dec 2011
    Beans
    11

    Re: imperfect clearing of memory cache

    Quote Originally Posted by Impavidus View Post
    Do you, by any chance, use a non-standard kernel? Although you quoted 4.4.0-101-generic, which seems to be the standard on 16.04 and 14.04 with HWE. I imagine there might be a small memory leak in the kernel (but that should have been discovered) or some driver, but I don't feel capable providing more help with that.

    And any particular reason to keep your computer running very slowly for a couple of days more instead of a simple reboot?
    Yes, I use standard software.
    It's no reason, but my uptimes used to be 60 days several months ago, and restarting system every 3 days is something terrible for me now...

  6. #16
    Join Date
    Dec 2011
    Beans
    11

    Re: imperfect clearing of memory cache

    Quote Originally Posted by photonxp View Post
    What is "Web Content" here? Do you use it a lot or just occasionally? What is it running for?
    You can try killing "Web Content" and then run again the command:
    Code:
    free && sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" && free
    You can run this command as non-root user then enter the password for root when it's required.
    It's firefox. I'll try this several days later when enough amount of memory will leak.

  7. #17
    Join Date
    Dec 2011
    Beans
    11

    Re: imperfect clearing of memory cache

    Quote Originally Posted by mirzman View Post
    It died
    I tried echo 10000000 >/proc/sys/vm/min_free_kbytes
    The result will be several days later
    System went to swap immediately... This don't work.
    Code:
    root@mirzman-workstation:~# uptime
     14:04:08 up 56 min,  1 user,  load average: 2,39, 1,60, 1,19
    root@mirzman-workstation:~# cat /proc/sys/vm/min_free_kbytes
    10000000
    root@mirzman-workstation:~# free && sync && echo 3 > /proc/sys/vm/drop_caches && free
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     1281416    14197052      429076      816196     1846350
    Swap:      16636924     1257740    15379184
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     1281576    14205440      428680      807648     1850532
    Swap:      16636924     1257612    15379312

  8. #18
    Join Date
    Dec 2011
    Beans
    11

    Re: imperfect clearing of memory cache

    Quote Originally Posted by photonxp View Post
    You can try killing "Web Content" and then run again the command:
    Code:
    free && sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" && free
    You can run this command as non-root user then enter the password for root when it's required.
    It don't help...

    Code:
    root@mirzman-workstation:~# free && sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" && free
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     4663356      432936      597716    11198372     1134764
    Swap:      16636924      576192    16060732
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     4664364     1172776      578144    10457524     1206540
    Swap:      16636924      576192    16060732
    
    root@mirzman-workstation:~# killall -9 firefox
    
    root@mirzman-workstation:~# ps --sort -rss -eo pid,pmem,rss,vsz,comm | awk '{sum+=$3}END{print sum}'
    2886740
    
    root@mirzman-workstation:~# ps --sort -rss -eo pid,pmem,rss,vsz,comm | head -20
      PID %MEM   RSS    VSZ COMMAND
     2092  1.9 321712 3001048 Telegram
    22052  1.8 302164 2490956 chromium-browse
    19246  1.7 285720 2376336 thunderbird
    21898  1.3 225412 3171484 chromium-browse
     1037  0.8 134940 626540 Xorg
     2235  0.6 109484 1249884 compiz
     2113  0.5 87680 767204 gnome-system-mo
    22034  0.5 85752 1118964 chromium-browse
     8157  0.5 83064 1714332 chromium-browse
     1892  0.4 66880 1305000 nautilus
     1888  0.3 64620 1367316 gnome-software
     2130  0.3 53492 724940 gnome-terminal-
    23510  0.3 53184 1723176 chromium-browse
    23980  0.2 46448 1699960 chromium-browse
    22249  0.2 37656 2191820 chromium-browse
     1726  0.2 35264 736964 hud-service
    10018  0.2 32860 1143852 gedit
     4645  0.1 31044 1650392 chromium-browse
    22243  0.1 30928 2104872 chromium-browse
    
    root@mirzman-workstation:~# free && sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches" && free
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     1958312     3720052      571324    10616300     3918284
    Swap:      16636924      535036    16101888
                  total        used        free      shared  buff/cache   available
    Mem:       16294664     1954044     3958448      571028    10382172     3923780
    Swap:      16636924      535032    16101892

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