[systemd-devel] Antw: [EXT] Re: Memory in systemctl status

[Ulrich Windl]

>>> Reindl Harald <h.reindl at thelounge.net> schrieb am 28.09.2020 um 11:37 in
Nachricht <0e47024a-faeb-bb78-9b08-fdfad2a235e1 at thelounge.net>:

> 
> Am 28.09.20 um 11:19 schrieb Benjamin Berg:
>>> if i would set "MemoryMax" to 4G "Memory: 8.6G" would kill it when the
>>> caches are accounted in that context
>> 
>> No, the kernel kicks in and reclaims memory at that point. Which can
>> mean either swapping or just dropping caches.
> 
> caches have *nothing* to do with the service itself
> 
>> It really sounds to me like ulimit fits better what you are trying to
>> do. That is available through Limit*=, see systemd.exec.
> 
> hell first i want a output in "systemctl status whatever" which is true
> and don't contain a ISO image downloaded by someone two days ago
> 
> not more and not less
> 
> httpd don't use 8.7 GB RAM - period

Are you really sure about that? I haven't checked apache recently, but years
ago, static content was memory-mapped for performance reasons.

> 
> the only interesting memory is RES of all the processes
> 
> my Firefox on the desktop don't use 32 GB RAM even when VIRT shows that
> and even if the latest download of a 10 GB file is somewhere in the OS
> caches in case it's opened later - it's *free* memory
> 
>  Main PID: 713 (httpd)
>     Tasks: 16 (limit: 1024)
>    Memory: 8.7G
>       CPU: 2h 24min 14.348s
>    CGroup: /system.slice/httpd.service
>            ├─    713 /usr/sbin/httpd -D FOREGROUND
>            ├─2435242 /usr/sbin/httpd -D FOREGROUND
>            ├─2435243 /usr/sbin/httpd -D FOREGROUND
>            ├─2435931 /usr/sbin/httpd -D FOREGROUND
>            ├─2435942 /usr/sbin/httpd -D FOREGROUND
>            ├─2435944 /usr/sbin/httpd -D FOREGROUND
>            ├─2435947 /usr/sbin/httpd -D FOREGROUND
>            ├─2435948 /usr/sbin/httpd -D FOREGROUND
>            ├─2435952 /usr/sbin/httpd -D FOREGROUND
>            ├─2435954 /usr/sbin/httpd -D FOREGROUND
>            ├─2435960 /usr/sbin/httpd -D FOREGROUND
>            ├─2435966 /usr/sbin/httpd -D FOREGROUND
>            ├─2435968 /usr/sbin/httpd -D FOREGROUND
>            ├─2435969 /usr/sbin/httpd -D FOREGROUND
>            ├─2435970 /usr/sbin/httpd -D FOREGROUND
>            └─2435972 /usr/sbin/httpd -D FOREGROUND
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