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# Memory Input Plugin
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The mem plugin collects system memory metrics.
For a more complete explanation of the difference between *used* and
*actual_used* RAM, see [Linux ate my ram ](http://www.linuxatemyram.com/ ).
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## Global configuration options <!-- @/docs/includes/plugin_config.md -->
In addition to the plugin-specific configuration settings, plugins support
additional global and plugin configuration settings. These settings are used to
modify metrics, tags, and field or create aliases and configure ordering, etc.
See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
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[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
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## Configuration
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```toml @sample .conf
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# Read metrics about memory usage
[[inputs.mem]]
# no configuration
```
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## Metrics
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Available fields are dependent on platform.
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- mem
- fields:
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- active (integer, Darwin, FreeBSD, Linux, OpenBSD)
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- available (integer)
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- 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)
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- total (integer)
- used (integer)
- used_percent (float)
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- 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)
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## Example Output
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```text
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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,wired=0i,write_back=0i,write_back_tmp=0i 1574712869000000000
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```
