The recommended way is to wrap i3status as described in its manpage.

On Wed, Sep 16, 2015 at 8:01 AM, Ciprian Dorin Craciun
<> wrote:
> I've just looked in the `i3status` manual to see how to display the
> free memory (as reported by `free`), and found no option.
> I understand from the manual that computing the used memory is not
> easy, but displaying the total used or free memory (both RAM and swap)
> as reported by `free` is quite easy and useful.
> My particular usecase is this:  I use quite a few of `tmpfs` instances
> mounted for various development purposes, which consume quite a lot of
> memory (in terms of GiB) and which spill over to swap (sometimes
> leaving me without any memory RAM or swap), and I would like to easily
> find out when I'm close to "out-of-memory".
> Looking through the i3 mailing list archive I found other usecases of
> such a feature:
> * `[i3] memory information in i3status` from 1st of April 2015, which
> talks about many processes chewing RAM;
> * `[i3] memory display` from 15th November 2014, which talks about
> image processing applications;
> There even seems to be a rejected patch implementing this in `[i3]
> [RFC] [PATCH] i3status: memory-stats` from 23th February 2012, or
> `[i3] [PATCH] i3status: implements a memory-usage-print` from the same
> day.
> Thus although the average desktop user never runs out of memory
> (either he has enough these days or uses swap), there are people --
> especially developers or those using memory intensive applications
> like scientific or image processing -- that easily overrun both their
> RAM an swap.  For example I have on my laptop 8 GiB RAM and a 32 GiB
> swap, and I'm constantly running out of available memory due to the
> mentioned `tmpfs` instances.
> Thanks,
> Ciprian.

Best regards,

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