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Sum up RAM usage per program

harmlessProcessesdebian, ubuntu
user@server
ps -eo rss=,comm= | awk '{a[$2]+=$1} END {for (p in a) printf "%8.1f MB  %s\n", a[p]/1024, p}' | sort -rn | head -15

Adds up the RSS value of all processes per program name and prints the result in MB. This shows at a glance whether, say, 40 php-fpm workers together use more memory than the database. Helpful for setting pm.max_children or cache sizes realistically.

Note: Shared memory is counted for every process, so the values are an upper bound.

Also searched as

  • how much ram do all php-fpm processes use together
  • total memory per service
  • total apache ram usage
  • which program uses the most memory overall

Related one-liners

All in Processes

Show processes with the highest RAM usage

$ps -eo pid,user,%mem,rss,cmd --sort=-rss | head -15
harmlessProcesses

Count processes per user

$ps -eo user= | sort | uniq -c | sort -rn
harmlessProcesses

Find out which processes are using swap

$for f in /proc/[0-9]*/status; do awk '/^Name:/ {n=$2} /^VmSwap:/ {print $2, "kB", n}' "$f"; done 2>/dev/null | sort -rn | head -15
harmlessProcesses

Find processes killed by the OOM killer

#journalctl -k --no-pager | grep -iE "out of memory|oom-kill|killed process"
harmlessProcesses

Find zombie processes and their parent processes

$ps -eo pid,ppid,stat,cmd | awk 'NR == 1 || $3 ~ /^Z/'
harmlessProcesses

Show processes as a tree with parents and children

$ps -ef --forest
harmlessProcesses

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