![]() ![]() Unlike the data provided by the cache or free fields, this field takes into account page cache and also that not all reclaimable memory slabs will be reclaimed due to items being in use (MemAvailable in /proc/meminfo, available on kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as free) available: Estimation of how much memory is available for starting new applications, without swapping.cache: Memory used by the page cache and slabs (Cached and Slab in /proc/meminfo).buffers: Memory used by kernel buffers (Buffers in /proc/meminfo).shared: Memory used (mostly) by tmpfs (Shmem in /proc/meminfo, available on kernels 2.6.32, displayed as zero if not available).free: Unused memory (MemFree and SwapFree in /proc/meminfo).used: Used memory (calculated as total – free – buffers – cache).total: Total installed memory (MemTotal and SwapTotal in /proc/meminfo).The information is gathered by parsing /proc/meminfo. The command also displays the total amount of swap memory in the system and buffers and caches used by the Linux kernel. The free command is used to display amount of free and used memory in the system. If you want to make top a bit more memory-friendly, issue the command top -o %MEM, which will cause top to sort all processes by memory used (see figure below). ![]()
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