Zram
Zram is a Linux kernel module that creates a compressed block device in RAM, acting as a swap space to improve system performance by reducing disk I/O for memory-intensive tasks. It compresses data in memory before swapping, allowing more efficient use of available RAM and minimizing the need for slower disk-based swap. This tool is particularly useful for systems with limited RAM or high memory pressure, such as embedded devices, virtual machines, or low-end servers.
Developers should learn and use Zram when optimizing Linux systems for better memory management, especially in resource-constrained environments like IoT devices, containers, or cloud instances where disk I/O is a bottleneck. It helps prevent performance degradation during memory spikes by compressing swap data in RAM, reducing latency compared to traditional disk-based swap. Use cases include improving responsiveness on systems with SSDs to extend their lifespan by minimizing write cycles, or enhancing performance in virtualized setups where memory is shared.