Many workloads present opportunities for sharing memory across virtual machines. The amount of memory reserved for the host depends on the host operating system and the size of the host computer's memory. Some memory must be kept available on the host to ensure the host is able to operate properly while virtual machines are running. To help guard against virtual machines causing the host to thrash, VMware Workstation enforces a limit on the total amount of RAM that may be consumed by virtual machines. When a Windows or Linux host operating system does not have enough RAM for its own use, it thrashes it constantly swaps parts of itself between RAM and its paging file on disk. Host operating systems do not behave well when they run low on free memory for their own use.
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