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Mem: represents the physical memory statistics - / + buffers / cached: represents the physical memory cache statistics Swap: indicates a swap partition on the hard disk usage, where we do not care. System's total physical memory: 2021M, but the current system is not really the first line of memory available free labeled pvr cinemas goregaon 477M, it only represents unallocated memory. We use total1, used1, pvr cinemas goregaon free1, used2, pvr cinemas goregaon free2 other names to represent the values of the above statistics, 1,2, respectively, represent the first and second rows of data. total1: indicates the total physical memory. used1: indicates total allocated to the cache (including buffers and cache) the quantity used, but which may be part of the cache does not actually use. free1: pvr cinemas goregaon not allocated memory. shared1: shared memory, the general system will not be used, nor discussed here. buffers1: the system of buffers allocated but unused number. cached1: pvr cinemas goregaon System cache allocated but unused number. See the difference pvr cinemas goregaon between buffer and cache behind. used2: the actual use of buffers and cache volume, but also the actual amount of memory used. free2: unused buffers and cache and not the sum of the allocated memory, which is the current system the actual available memory. You can sort out the following equation: total1 = used1 + free1
free2 = buffers1 + cached1 + free1 free1 Many people mistakenly think that the actual remaining memory, still wondering why Linux system takes up so much memory, in fact, this is normal. Two. Buffer and cache difference A buffer is something that has yet to be "written" to disk. A cache is something that has been "read" from the disk and stored for later use.
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