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oktober 17, 2019
I have a notebook, an old Acer Aspire One with only 512 MB RAM. I try to minimise RAM usage, by only running things that I really need. To get an overview of the RAM usage by system dæmons, the following snippet was useful:
ps aux | grep -E '[r]oot|www-data|sbin' | mawk {'print $6 "\t" $11 " " $12 " " \ $13 " " $14'} | grep -v '\[' | sort -n -r 11724 X :0 vt7 vt7 3088 /usr/sbin/hald 2972 sshd: root@notty 2632 ssh -x -a -oClearAllForwardings=yes 2568 wvdial 2360 /usr/sbin/slapd -h ldap:/// ldapi:/// 2212 /usr/sbin/console-kit-daemon --no-daemon 1844 /usr/sbin/privoxy --pidfile /var/run/privoxy.pid --user 1268 /usr/sbin/rsyslogd -c4 1152 hald-runner 1148 sudo wvdial 1088 hald-addon-input: Listening on /dev/input/event10 1068 /usr/sbin/pppd 460800 modem crtscts 1056 sshfs root@127.0.0.1:/ mnt/local/ 1028 /usr/lib/openssh/sftp-server 1004 /usr/lib/hal/hald-addon-rfkill-killswitch 1004 /usr/lib/hal/hald-addon-leds 988 /usr/lib/hal/hald-addon-cpufreq 960 /usr/sbin/hostapd -B -P /var/run/hostapd.wlan0.pid 872 /usr/sbin/sshd 852 /usr/sbin/nodm 852 /usr/sbin/dnsmasq -x /var/run/dnsmasq/dnsmasq.pid -u 848 /usr/sbin/pcscd 796 /usr/sbin/cron 636 /usr/sbin/exim4 -bd -q30m 632 ssh -o ServerAliveInterval=30 -i 628 /usr/bin/xinit /usr/sbin/nodm -- vt7 548 /usr/sbin/acpid 512 /usr/sbin/nodm 512 udevd --daemon 472 /sbin/getty 38400 tty1 404 /usr/sbin/ifplugd -i eth0 -q 380 /sbin/portmap 324 udevd --daemon 324 udevd --daemon 296 /usr/sbin/atd 144 /usr/sbin/acpi_fakekeyd
The leftmost columns shows the amount of resident RAM used.
The mawk stuff can probably be enhanced, but - as is - it gives the essential information.
The output above is what I have now, after stopping some dæmons that took a lot of RAM, specifically tor, which I now only run when I need it. Another dæmon that could be started when needed is pcscd, which could be started automatically when a card-reader is inserted into a USB-port.