The solution to the raspberry pi swap space problem

Today, when I compiled a large C project on the Raspberry Pi, I found that the speed would be very slow and crashed after each compilation to 43. Baidu later found that the swap space might be insufficient, and the crash problem was solved only after adding 1G of swap space.

The default swap space of Raspberry Pi 3B is 99m, which is obviously not enough for compiling some larger projects, and it is easy to crash. The solution for increasing swap is given below.

Add a swap space to /opt/image

cd / opt
sudo mkdir image
cd image
sudo touch swap #create file
sudo dd if=/dev/zero of=/opt/image/swap bs=1024 count=1024000 #Add a swap file and set it to 1G
# will return after a while (this is slightly slower)
#1024000+0 records in
#1024000+0 records out
#size copied, time used s, speed MB/s
sudo mkswap /opt/image/swap #Set up swap space

sudo swapon /opt/image/swap #Enable the new swap space
free -m #Confirm whether it has taken effect

#Afterwards, modify the /etc/fstab file so that this swap can take effect after restarting, and add it at the end of the file

/opt/image/swap    /swap    swap    defaults 0 0

Reference link: https://blog.csdn.net/wxz3wxz/article/details/70237302