Gitlab: Extremely high memory consumption by ruby "bundle" process

mode777 asked:

I have a problem with my gitlab installation running on a small Ubuntu LTS 16.04. I have to point out that I dont have much experience with Linux oder Gitlab.

My Gitlab installation with a few personal projects (only 4) was running Ok, though pushing is extremely slow and sometimes fails. Also accessing the webinterface is extremely slow.
I checked the server and noticed that up to 96% of total memory were used. The culprit seems to be a bundle process.

top - 00:15:30 up 59 days, 16:17,  1 user,  load average: 0.00, 0.01, 0.09
Tasks: 160 total,   1 running, 159 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.5 us,  0.2 sy,  0.0 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 72.4/2048272  [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||                           ]
KiB Swap:  0.0/0        [                                                                                                    ]

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 8760 git       20   0  648908 412768  14700 S   0.7 20.2   0:30.58 bundle
 8799 git       20   0  513748 302632  14300 S   0.0 14.8   0:20.02 bundle
 8833 git       20   0  513748 293028   4696 S   0.0 14.3   0:00.03 bundle
 8839 git       20   0  513748 292904   4572 S   0.0 14.3   0:00.02 bundle
 8836 git       20   0  513748 292840   4508 S   0.3 14.3   0:00.04 bundle
11792 mysql     20   0 1567168 158296      0 S   0.0  7.7   5:01.31 mysqld
32688 root      20   0 11.279g  99476   1164 S   0.0  4.9   1:21.06 dotnet
 8092 gitlab-+  20   0  576816  39616  39020 S   0.0  1.9   0:00.10 postgres
 8854 gitlab-+  20   0  595572  15004  10524 S   0.0  0.7   0:00.09 postgres
 8075 git       20   0  128348  14896   7680 S   0.0  0.7   0:00.07 gitlab-workhors
 8830 gitlab-+  20   0  592816  12196   9780 S   0.0  0.6   0:00.04 postgres
 9534 gitlab-+  20   0  592824  12060   9668 S   0.0  0.6   0:00.01 postgres
 8781 gitlab-+  20   0  592816  11932   9616 S   0.0  0.6   0:00.02 postgres
32684 root      20   0   61856  11420      0 S   0.0  0.6  23:35.39 supervisord
 8100 gitlab-+  20   0   37552  11112   2868 S   0.3  0.5   0:03.74 redis-server
 8094 gitlab-+  20   0  577068   7944   7324 S   0.0  0.4   0:00.01 postgres
 8087 gitlab-+  20   0   46756   7932   2900 S   0.0  0.4   0:00.01 nginx
 8095 gitlab-+  20   0  577068   7052   6444 S   0.0  0.3   0:00.06 postgres
 8088 gitlab-+  20   0   46412   6752   1992 S   0.0  0.3   0:00.10 nginx
  975 root      20   0   38236   6368   1908 S   0.0  0.3   8:47.56 systemd-journal
 8097 gitlab-+  20   0  578076   5600   4240 S   0.0  0.3   0:00.05 postgres
 8086 root      20   0   42240   5524   4696 S   0.0  0.3   0:00.00 nginx
  974 root      20   0   12204   4720     60 S   0.0  0.2   2:33.12 haveged
    1 root      20   0  185260   4308   2408 S   0.0  0.2   3:23.22 systemd
 7757 root      20   0   25224   4256   2484 S   0.0  0.2   0:00.28 bash
 9857 root      20   0   42468   3708   3076 R   0.0  0.2   0:00.09 top
 8098 gitlab-+  20   0   26956   3296   2608 S   0.0  0.2   0:00.08 postgres
 8089 gitlab-+  20   0   42424   3260   2224 S   0.0  0.2   0:00.01 nginx
 8784 git       20   0   18100   2980   2664 S   0.0  0.1   0:00.38 gitlab-unicorn-
 8096 gitlab-+  20   0  577068   2932   2332 S   0.0  0.1   0:00.03 postgres

I’ve hit pstree and these bundle processes seem to be related to the ruby application (must be gitlab).

systemd─┬─agetty
        ├─atd
        ├─bundle─┬─3*[bundle───{ruby-timer-thr}]
        │        └─{ruby-timer-thr}
... 

Does anyone have had similar experiences or an idea what might cause this?

My answer:


Those will be the unicorn workers and sidekiq. They appear to be using the correct amount of memory. 2GB is about the bare minimum of RAM to run gitlab; if your system has much of any activity you’ll want 4GB or more.

I have a personal gitlab instance on 2GB of RAM as well, and it shows similar usage:

top - 23:30:42 up 5 days,  7:53,  1 user,  load average: 0.04, 0.03, 0.05
Tasks: 172 total,   2 running, 170 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.2 us,  0.2 sy,  0.0 ni, 98.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  2048816 total,    72636 free,  1762504 used,   213676 buff/cache
KiB Swap:  1048572 total,   801180 free,   247392 used.    73972 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
  664 git       20   0  715620 458296   2964 S   3.0 22.4 139:48.55 bundle      
 1623 git       20   0  543608 327472   3044 S   0.0 16.0   3:46.02 bundle      
 1626 git       20   0  543608 324384   3224 S   0.0 15.8   3:51.97 bundle      
 1620 git       20   0  543608 324244   3088 S   0.0 15.8   3:51.68 bundle      
 1556 git       20   0  510840 149736   2616 S   0.0  7.3   0:18.45 bundle    

Note that top doesn’t show you what the processes are really doing, but you can easily find out with ps. For instance:

# ps 664
  PID TTY      STAT   TIME COMMAND
  664 ?        Ssl  139:49 sidekiq 4.2.1 gitlab-rails [0 of 25 busy]
# ps 1556
  PID TTY      STAT   TIME COMMAND
 1556 ?        Sl     0:18 unicorn master -D -E production -c /var/opt/gitlab/gitlab-rails/etc/unicorn.rb /opt/gitlab/embedded/service/gitlab-rails/config.ru

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