How to change Raspberry Pi's Swapfile Size on Raspbian
# Reason Why Ever get the dreaded error: ``` Virtual memory exhausted: Cannot allocate memory ``` With the first iterations of Raspberry Pi the Model A comes with 256mb of memory. While the Raspberry Pi B comes with a modest 512mb of memory. For most applications this amount of memory is actually quiet a bit. As soon as you start compiling your own binaries this amount starts to seem dismal. > Insert reason why swap on flash-based memory is bad here. # Limitations The Raspbian distribution comes with a 100mb swapfile. This is actually a bit on the small side. A general rule of thumb is swapfile size should be about twice as much as the available RAM on the machine. In the examples below I have a Raspberry Pi B+. So the amount of swap I use is 1024mb. # Commands We will change the configuration in the file */etc/dphys-swapfile *: ``` sudo nano /etc/dphys-swapfile ``` The default value in Raspbian is: ``` CONF_SWAPSIZE=100 ``` We will need to change this to: ``` CONF_SWAPSIZE=1024 ``` Then you will need to stop and start the service that manages the swapfile own Rasbian: ``` sudo /etc/init.d/dphys-swapfile stop sudo /etc/init.d/dphys-swapfile start ``` You can then verify the amount of memory + swap by issuing the following command: ``` free -m ``` The output should look like: ``` total used free shared buffers cached Mem: 435 56 379 0 3 16 -/+ buffers/cache: 35 399 Swap: 1023 0 1023 ``` # Finished! That should be enough swap to complete any future compiles I may do in the future. Reprint from [bitpi.co](https://www.bitpi.co/2015/02/11/how-to-change-raspberry-pis-swapfile-size-on-rasbian/)
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