[Xymon] wrong memory report with free command from procps-ng

[Dominique Frise]

Hi Japhet,

Thanks for the patch.
On clients with 3.10 kernels, we found wiered  that the  value for "Physical Used" is now less than the one for "Actual Used".
Have you an explanation for that ?

For compatibility with the <3.10 kernels  memory display, we have following suggestions for mapping the displayed values:
 - "Actual Used" should be mapped to "used"
 - "Physical Used" should be mapped to "buff/cache"

What do you think about this?

Dominique
 
________________________________________
De : J.C. Cleaver <cleaver at terabithia.org>
Envoyé : dimanche 3 mai 2015 01:35
À : Dominique Frise
Cc : xymon at xymon.com
Objet : Re: [Xymon] wrong memory report with  free command from procps-ng

On Thu, April 23, 2015 5:26 am, Dominique Frise wrote:
> Hi,
>
>
> Using Xymon 4.3.19, we noticed that all our RHEL 7 systems are reporting
> wrong values.
>
> These systems now use free from procps-ng 3.3.10 whose output has changed.
>
>
> -- free output on RHEL 5/6 ---
>
> [bb at prdexp ~]$ free
>
>              total       used       free     shared    buffers     cached
> Mem:      65916528   63391732    2524796    1376104    1484472   47773272
> -/+ buffers/cache:   14133988   51782540
> Swap:     16777212     180816   16596396
>
>
> --- free output on RHEL 7 ---
>
> [bb at hns ~]$ free
>               total        used        free      shared  buff/cache
> available
> Mem:        8011888      318844     3365516       98788     4327528
> 7275020
> Swap:       8388604           0     8388604
>
>
>
> The "-/+ buffers/cache:" has disappeared, the "used" is now calculated as
> total - free - buffers - cache, and there is an "available" column which
> is an "Estimation of how much memory is available for starting new
> applications, without swapping".
>
> The man page details all that.
>
>
> Dominique
>
> University of Lausanne
>
>


Thanks...

Mind if you could try the following patch? And let me know if it works (it
does for me on an EL7 and Fedora 21).

I went ahead and took the opportunity to begin using the "Available"
figure as the "Actual Used" (well, the Phys - Available figure), since
that's going to be a more realistic figure on kernel's new enough to
support it.


Regards,
-jc