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Technical Tip: MemFree vs MemAvailable for Memory Debug

Description

This Article describes the difference between the Available and Free memory in the 'diag hardware mem list' output.

Scope

FortiWeb, FortiWeb-VM.

Solution

While diagnosing the memory consumption on FortiWeb, the 'diag hardware mem list' is run in Fortiweb CLI.

This command gives the below output with a few more parameters:

Viva-kvm45 ## diag hardware mem list
MemTotal: 10071280 kB
MemFree: 7315196 kB <-----
MemAvailable: 7617908 kB <-----

Buffers: 140528 kB
Cached: 297528 kB

Differences between MemFree vs MemAvailable are underlined here. These terms sound similar but have some differences.

MemFree: The amount of RAM, in Kilobytes. The system left them as unused in the system
MemAvailable: The amount of memory, available for starting new applications, without swapping.

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