Hi Francis,
ganglia gives you two main pieces of information:
- actually used memory (blue graph)
- used + cached memory (green graph)
Whether you interpret cached memory as free or not, is up to you. Generally
it is free, but if you dump all caches and use them for processes, your
systems will start to crawl under heavy IO load.
Red color in ganglia (not here in chart where it means total amount of
memory excluding swap) signifies that given system/cluser is under high
load. This is not necessarily related to memory usage.
> really free memory is free memory + inactive ( cache) + active ( cache )
-----> NO ?
Yes, that is the essence of it.
b.
On 17 September 2015 at 13:17, Francis Fichter <fichterfran...@gmail.com>
wrote:
> hello,
>
> When memory is in cache ( active or inactive ) linux kernel not report
> this memory to free to use, but, if systeme wanna more ram, it can take in
> inactive memory first and after take the active memory ( in cache ).
>
> Lot of reporting software report used ( like linux kernel ) buffer +
> Use + all cache memory ( inactive or active ), but really free memory is
> free memory + inactive ( cache) + active ( cache ) -----> NO ?
>
> In ganglia i see, systeme become RED, but have lot of cache memory, it
> s not a bad count.
>
> [image: Images intégrées 1]
>
> Best Regards
>
>
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