On Wed, Mar 18, 2015 at 9:07 AM, Alison Chaiken <ali...@she-devel.com> wrote:
> After reading about the 'minimal build' on the systemd wiki, I decided > to experiment. > > 0. WIth basically all options turned on, in a Fedora 21 Qemu, systemd > used about 300 MB of memory according to 'sudo memstat -p 1'. > > 1. With ./configure --disable-gtk-doc --disable-seccomp [&c.] > > In this case, 'memstat -p 1' says systemd uses about 119 MB of memory. > memstat only reports *virtual* memory size, including mapped files and other things that only need the address space, but *not necessarily* occupy physical RAM or any other shared resources. Remember that each process has its own address space, it's not really a sparse resource... (So tools like `journalctl` might even show up as "using" more total memory than the system actually *has*.) So the number is mostly meaningless if you're trying to determine actual resource usage. The "RSS" column in `ps u 1`, `pmap -x -p 1` or in htop describes it a bit better. Generally systemd-pid1 will be ~5 MB; journald tends to be the largest – it's 12 MB on my system [though in previous versions it used to grow to 50 or even 100 MB]. -- Mantas Mikulėnas <graw...@gmail.com>
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