SwapPartition

SwapPartition refers to a dedicated disk partition configured as swap space on a computer running a Unix-like operating system. Swap space serves as virtual memory, allowing the kernel to move inactive pages from RAM to disk when memory pressure rises. A partition-based swap area is common on Linux systems, where it is created as a partition with a Linux swap type and enabled at boot, distinct from a swap file stored within a filesystem.

Creation and management: During disk setup, a partition is created and marked as Linux swap (type 82). The partition is formatted for swap with a tool such as mkswap and activated with swapon; it can be disabled with swapoff. To persist across reboots, an entry is added to /etc/fstab or a systemd swap unit. Current swap usage can be checked via swapon --show or /proc/swaps.

Sizing and considerations: Ideal swap size depends on workload and RAM size. Traditional guidance suggested 1–2 times the amount of installed RAM, but modern systems may require less, especially with larger memories. A swap area is also necessary if hibernation is supported, since the entire RAM image must fit into swap. Performance degrades when the system swaps frequently; using an SSD for a swap partition reduces latency, while technologies such as zram or zswap can mitigate swap overhead. Finally, swap partitions are less flexible to resize than swap files and require partitioning changes to adjust.