Support: Created page with 'You can create a file on a microSD card as swap space to extend system memory. Swap is significantly slower than RAM so performance will be affected, but you will reduce the chan…'

Support — Wed, 16 Mar 2016 20:23:40 GMT

Created page with 'You can create a file on a microSD card as swap space to extend system memory. Swap is significantly slower than RAM so performance will be affected, but you will reduce the chan…'

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You can create a file on a microSD card as swap space to extend system memory. Swap is significantly slower than RAM so performance will be affected, but you will reduce the chance of running out of memory .

These steps allow you to create and mount a 64 MB swap file when booting from a microSD card.

# dd if=/dev/zero of=/swapfile bs=1024 count=65536
65536+0 records in
65536+0 records out
67108864 bytes (67 MB) copied, 15.0498 s, 4.5 MB/s
# chmod 600 /mnt/swapfile
# mkswap /mnt/swapfile
Setting up swapspace version 1, size = 65532 KiB
no label, UUID=961c7861-e5fe-46c4-97b5-374b28e6adb2
# swapon /swapfile
[ 1567.710000] Adding 65532k swap on /mnt/swapfile. Priority:-1 extents:90 across:86764k SS
# free
total used free shared buffers cached
Mem: 61192 59736 1456 8660 116 40488
-/+ buffers/cache: 19132 42060
Swap: 65532 0 65532

To mount the swap file automatically after reboot add the following line to /etc/fstab

/swapfile none swap sw 0 0

NOTE: swap files are not supported on compressed file systems like the JFFS2 used in NAND

Adding swap space - Revision history

Support: Created page with 'You can create a file on a microSD card as swap space to extend system memory. Swap is significantly slower than RAM so performance will be affected, but you will reduce the chan…'