Rev. | a50ec831988ad8e62bcfa6dbe861534b3bc5638f |
---|---|
Größe | 965 Bytes |
Zeit | 2015-04-20 04:47:09 |
Autor | Lorenzo Isella |
Log Message | A script to clear and reactivate the swap only when there is free memory available. |
#!/bin/bash
# Make sure that all text is parsed in the same language
# export LC_MESSAGES=en_US.UTF-8
# export LC_COLLATE=en_US.UTF-8
# export LANG=en_US.utf8
# export LANGUAGE=en_US:en
# export LC_CTYPE=en_US.UTF-8
# Calculate how much memory and swap is free
free_data="$(free)"
mem_data="$(echo "$free_data" | grep 'Mem:')"
free_mem="$(echo "$mem_data" | awk '{print $4}')"
buffers="$(echo "$mem_data" | awk '{print $6}')"
cache="$(echo "$mem_data" | awk '{print $7}')"
total_free=$((free_mem + buffers + cache))
used_swap="$(echo "$free_data" | grep 'Swap:' | awk '{print $3}')"
echo -e "Free memory:\t$total_free kB ($((total_free / 1024)) MB)\nUsed swap:\t$used_swap kB ($((used_swap / 1024)) MB)"
# Do the work
if [[ $used_swap -eq 0 ]]; then
echo "Congratulations! No swap is in use."
elif [[ $used_swap -lt $total_free ]]; then
echo "Freeing swap..."
swapoff -a
swapon -a
else
echo "Not enough free memory. Exiting."
exit 1
fi