On Sun, 2020-09-27 at 17:45 +0200, Reindl Harald wrote: > > Am 27.09.20 um 14:08 schrieb Greg KH: > > On Sun, Sep 27, 2020 at 01:41:33PM +0200, Reindl Harald wrote: > > > Memory: 8.6G > > > > > > looks like there is a large part of os-caching included where i wonmder > > > how that's done because a file can be read by muliple processes / > > > services and is hopfefully only once cached I believe it is generally accounted against the cgroup that caused it to be read into main memory. The cgroup documentation probably has more details. > > > however, that value makes little to no sense and if that's the same > > > value as accounted for "MemoryMax" it's plain wrong But it does make sense. File caches are part of the working set of memory that a process needs. Setting MemoryMax=/MemoryMin= limits/guarantees the size of this working set. These kinds of limits or protections would be a lot less meaningful if caches were not accounted for. Benjamin > > > [root@arrakis:~]$ free > > > total used free shared buff/cache > > > available > > > Mem: 15Gi 2.2Gi 585Mi 309Mi 12Gi > > > 12Gi > > > Swap: 0B 0B 0B > > > > The kernel does this, it's nothing to do with systemd or anything else. > > > > You can get "back" that memory for a short while if you really want it > > by doing: > > echo 3 > /proc/sys/vm/drop_caches > > > > For more details, see https://www.linuxatemyram.com/ > > you completly miss the point and should not cut in the middle of a post! > > Memory: 8.6G > > *no* httpd don't consume 8.6GB RAM > > the question is *why* systemd takes the os-cache into account of the > memory a service is using > > [root@arrakis:~]$ systemctl status httpd.service > ● httpd.service - Apache Webserver > Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; > vendor preset: disabled) > Drop-In: /etc/systemd/system/httpd.service.d > └─lockdown.conf > Active: active (running) since Sun 2020-09-20 07:53:39 CEST; 1 weeks > 0 days ago > Process: 1935633 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful > (code=exited, status=0/SUCCESS) > Main PID: 713 (httpd) > Tasks: 17 (limit: 1024) > Memory: 8.6G > CPU: 2h 8min 5.442s > CGroup: /system.slice/httpd.service > ├─ 713 /usr/sbin/httpd -D FOREGROUND > ├─2151772 /usr/sbin/httpd -D FOREGROUND > ├─2151803 /usr/sbin/httpd -D FOREGROUND > ├─2151805 /usr/sbin/httpd -D FOREGROUND > ├─2152130 /usr/sbin/httpd -D FOREGROUND > ├─2152132 /usr/sbin/httpd -D FOREGROUND > ├─2152188 /usr/sbin/httpd -D FOREGROUND > ├─2152189 /usr/sbin/httpd -D FOREGROUND > ├─2152199 /usr/sbin/httpd -D FOREGROUND > ├─2152211 /usr/sbin/httpd -D FOREGROUND > ├─2152213 /usr/sbin/httpd -D FOREGROUND > ├─2152214 /usr/sbin/httpd -D FOREGROUND > ├─2152215 /usr/sbin/httpd -D FOREGROUND > ├─2152217 /usr/sbin/httpd -D FOREGROUND > ├─2152220 /usr/sbin/httpd -D FOREGROUND > ├─2152756 /usr/sbin/httpd -D FOREGROUND > └─2152886 /usr/sbin/httpd -D FOREGROUND > _______________________________________________ > systemd-devel mailing list > systemd-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/systemd-devel
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