memsample

#!/bin/sh
# Collect data about memory usage of all processes
DOCS="https://github.com/yast/yast-installation/blob/master/doc/memsample.md"

# save memory by switching to a smaller shell
# bash RSS is at least 3 MB per process, dash RSS is around 1 MB
if [ -n "$BASH_VERSION" ] && [ -x /bin/dash ]; then
    exec /bin/dash "$0" "$@"
fi

while [ -n "$1" ]; do
    case "$1" in
        --archive=*)
            ARCHIVE=${1#--archive=}
            shift
            ;;
        --sleep=*)
            SLEEP=${1#--sleep=}
            shift
    esac
done
# default values
: "${ARCHIVE=./memsample.zcat}"
: "${SLEEP=5}"

echo >&2 "Sampling every $SLEEP s to $ARCHIVE"

{
    echo "### comment-0000-$(date -Iseconds)"
    echo "See $DOCS"
} | gzip -c >> "$ARCHIVE"

memsample_ps() {
    ps -e -H -o pid,tname,vsize:8,drs:8,trs:8,rss:8,size:8,ppid,args
}

I=0
while true; do
  I=$((I + 1))
  I_TIME=$(printf %04d $I)-$(date -Iseconds)

  # redirect STDERR to not break the YaST UI (bsc#1195116)
  {
      echo "### df-$I_TIME"
      df -k /

      echo "### free-$I_TIME"
      free -k

      echo "### ps-$I_TIME"
      memsample_ps
  } 2>&1 | gzip -c >> "$ARCHIVE"

  sleep "$SLEEP"
done