The Open Event Android App generator runs on a DigitalOcean. The deployment runs on a USD 10 box, that has 1 GB of RAM, but for testing I often use a USD 5 box, that has only 512mb of RAM.
When trying to build an android app using gradle and Java 8, there could be an issue where you run out of RAM (especially if it’s 512 only).
What we can do to remedy this problem is creating a swapfile. On an SSD based system, Swap spaces work almost as fast as RAM, because SSDs have very high R/W speeds.
Check hard disk space availability using
There should be an output like this
Filesystem Size Used Avail Use% Mounted on
udev 238M 0 238M 0% /dev
tmpfs 49M 624K 49M 2% /run
/dev/vda1 20G 1.1G 18G 6% /
tmpfs 245M 0 245M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 245M 0 245M 0% /sys/fs/cgroup
tmpfs 49M 0 49M 0% /run/user/1001
The steps to create a swap file and allocating it as swap are
sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
We can verify using
sudo swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 1024M 0B -1
And now if we see RAM usage using
free -h , we’ll see
total used free shared buff/cache available
Mem: 488M 37M 96M 652K 354M 425M
Swap: 1.0G 0B 1.0G
Do not use this as a permanent measure for any SSD based filesystem. It can corrupt your SSD if used as swap for long. We use this only for short periods of time to help us build android apks on low ram systems.