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1) Why cgroup is showing more number of tasks than actual number of tasks.?

Ex :

[root@localhost proc]# ps -aux | wc -l
421
[root@localhost proc]# cat /sys/fs/cgroup/memory/tasks | wc -l
539

2) Why cgroup is showing more memory usage then actual memory usage?

Ex :

[root@localhost memory]# free -h
              total        used        free      shared  buff/cache   available
Mem:            11G        425M        9.4G         38M        1.7G         10G
Swap:          2.0G        193M        1.8G
[root@localhost memory]# cat /sys/fs/cgroup/memory/memory.usage_in_bytes
1596362752

Above you can see free is showing used memory as 425M and cgroups is showing around 1.4GB?

Please note that there is only 1 default cgroup, no other cgroups are created

3) How to calculate correct/proper memory utilization for cgroups?

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1 Answer 1

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1) A multi-threaded process has a single line in ps aux output, when each thread is a task. Compare ps -auxH | wc -l

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  • Yes, Its correct, I have a question, i have created a thread and when i did "ps -aux" i can see lines for both the thread (Main process and its thread), So does it mean that only kernel's thread is not included in "ps -aux"?
    – Chirag
    Feb 15, 2016 at 4:12
  • And Yes Thank You :) I wish you could help in 3rd question, i have to calculate cgroup's memory status and i am not sure how to achieve that as cgroups's memory is different than "free -h".
    – Chirag
    Feb 15, 2016 at 4:13
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    I don't understand what you're calling "kernel thread". ps -aux lists only the main thread of each process, ps -auxH lists all threads.
    – L. Levrel
    Feb 16, 2016 at 16:08
  • As for your 3rd question, I'm sorry, I know very little about cgroups. (Maybe is shared memory counted several times? That'd be weird though.)
    – L. Levrel
    Feb 16, 2016 at 16:10

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