If you see that the amount of used Mem is high and free Mem is low, don’t panic (at least not straight away) as there is usually memory held for caching purposes to help speed things up. The ‘free’ command will provide the most accurate way of showing memory use, when run with the -m flag the output is easier to read as values will be shown in MB. If both main memory and swap become full your Linux system can completely freeze up.īy checking and monitoring the amount of memory in use and confirming there is enough free memory to service requests we can ensure that processes continue to run optimally. If this memory runs out, swap space will start to be used next, which will result in slower performance as I/O operations will need to be written to disk instead. In the Linux operating system it is important to have enough free physical memory (RAM) available for your processes which need to run.
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