Simple script to check how many swaps can your Linux run.

swap-check.sh

#!/usr/bin/env bash
# Author: Alex Baranowski
# License: MIT

# Max swap files tester
# magic number: 33 -> in theory 32 swap file on Linux can be used 33 = 32+1

echo "Deactivating all swaps that are used"
sudo swapoff -a

echo "Creating and activating tmp swaps"
for i in {1..33}; do
    SWAP_FILE="/swapfile-$i"
    # status=none == silent dd
    sudo dd status=none if=/dev/zero of=$SWAP_FILE bs=1M count=10
    sudo chmod 600 $SWAP_FILE
    # make it silent
    sudo mkswap $SWAP_FILE &> /dev/null
    sudo swapon $SWAP_FILE &> /dev/null || break
done

NUMBER_OF_ACTIVE_SWAPS=$(swapon --noheadings | wc -l)
echo -e "\n\n  System was able to use $NUMBER_OF_ACTIVE_SWAPS\n\n"

# Cleanup
echo "Deactivating temporary swaps"
sudo swapoff -a
echo "Removing temp swaps"
for i in {1..33}; do
    SWAP_FILE="/swapfile-$i"
    # make it silent
    sudo rm "$SWAP_FILE" &>/dev/null || break
done

echo "Reactivating swaps (only from /etc/fstab && skipping 'noauto')"
sudo swapon -a