# Memory Input Plugin

This plugin collects metrics about the system memory.

> [!TIP]
> For an explanation of the difference between *used* and *actual_used*
> RAM, see [Linux ate my ram][linux_ate_my_ram].

⭐ Telegraf v0.1.5
🏷️ system
💻 all

[linux_ate_my_ram]: http://www.linuxatemyram.com/

## Global configuration options <!-- @/docs/includes/plugin_config.md -->

Plugins support additional global and plugin configuration settings for tasks
such as modifying metrics, tags, and fields, creating aliases, and configuring
plugin ordering. See [CONFIGURATION.md][CONFIGURATION.md] for more details.

[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins

## Configuration

```toml @sample.conf
# Read metrics about memory usage
[[inputs.mem]]
  ## Collect extended memory statistics from /proc/meminfo (Linux)
  ## or from performance counters (Windows).
  # collect_extended = false
```

## Metrics

Available fields are dependent on platform.

- mem
  - fields:
    - active (integer, Darwin, FreeBSD, Linux, OpenBSD)
    - available (integer)
    - available_percent (float)
    - buffered (integer, FreeBSD, Linux)
    - cached (integer, FreeBSD, Linux, OpenBSD)
    - commit_limit (integer, Linux)
    - committed_as (integer, Linux)
    - dirty (integer, Linux)
    - free (integer, Darwin, FreeBSD, Linux, OpenBSD)
    - high_free (integer, Linux)
    - high_total (integer, Linux)
    - huge_pages_free (integer, Linux)
    - huge_page_size (integer, Linux)
    - huge_pages_total (integer, Linux)
    - inactive (integer, Darwin, FreeBSD, Linux, OpenBSD)
    - laundry (integer, FreeBSD)
    - low_free (integer, Linux)
    - low_total (integer, Linux)
    - mapped (integer, Linux)
    - page_tables (integer, Linux)
    - shared (integer, Linux)
    - slab (integer, Linux)
    - sreclaimable (integer, Linux)
    - sunreclaim (integer, Linux)
    - swap_cached (integer, Linux)
    - swap_free (integer, Linux)
    - swap_total (integer, Linux)
    - total (integer)
    - used (integer)
    - used_percent (float)
    - vmalloc_chunk (integer, Linux)
    - vmalloc_total (integer, Linux)
    - vmalloc_used (integer, Linux)
    - wired (integer, Darwin, FreeBSD, OpenBSD)
    - write_back (integer, Linux)
    - write_back_tmp (integer, Linux)

### Extended fields (`collect_extended = true`)

These fields are only collected when `collect_extended` is set to `true`.

#### Linux

- mem
  - fields:
    - active_anon (integer)
    - active_file (integer)
    - inactive_anon (integer)
    - inactive_file (integer)
    - percpu (integer)
    - unevictable (integer)

#### Windows

- mem
  - fields:
    - commit_limit (integer)
    - commit_total (integer)
    - page_file_avail (integer)
    - page_file_total (integer)
    - phys_avail (integer)
    - phys_total (integer)
    - virtual_avail (integer)
    - virtual_total (integer)

## Example Output

```text
mem active=9299595264i,available=16818249728i,available_percent=80.41654254645131,buffered=2383761408i,cached=13316689920i,commit_limit=14751920128i,committed_as=11781156864i,dirty=122880i,free=1877688320i,high_free=0i,high_total=0i,huge_page_size=2097152i,huge_pages_free=0i,huge_pages_total=0i,inactive=7549939712i,low_free=0i,low_total=0i,mapped=416763904i,page_tables=19787776i,shared=670679040i,slab=2081071104i,sreclaimable=1923395584i,sunreclaim=157675520i,swap_cached=1302528i,swap_free=4286128128i,swap_total=4294963200i,total=20913917952i,used=3335778304i,used_percent=15.95004011996231,vmalloc_chunk=0i,vmalloc_total=35184372087808i,vmalloc_used=0i,write_back=0i,write_back_tmp=0i 1574712869000000000
```

With `collect_extended = true` on Linux:

```text
mem active=9299595264i,active_anon=5765169152i,active_file=3534426112i,available=16818249728i,available_percent=80.41654254645131,buffered=2383761408i,cached=13316689920i,commit_limit=14751920128i,committed_as=11781156864i,dirty=122880i,free=1877688320i,high_free=0i,high_total=0i,huge_page_size=2097152i,huge_pages_free=0i,huge_pages_total=0i,inactive=7549939712i,inactive_anon=1081245696i,inactive_file=6468694016i,low_free=0i,low_total=0i,mapped=416763904i,page_tables=19787776i,percpu=5765120i,shared=670679040i,slab=2081071104i,sreclaimable=1923395584i,sunreclaim=157675520i,swap_cached=1302528i,swap_free=4286128128i,swap_total=4294963200i,total=20913917952i,unevictable=143360i,used=3335778304i,used_percent=15.95004011996231,vmalloc_chunk=0i,vmalloc_total=35184372087808i,vmalloc_used=0i,write_back=0i,write_back_tmp=0i 1574712869000000000
```