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Memory

Mem collector is used to collect system memory information, some general metrics such as total memory, used memory and so on.

Configuration

After successfully installing and starting DataKit, the Mem collector will be enabled by default without the need for manual activation.

Collector Configuration

Go to the conf.d/host directory under the DataKit installation directory, copy mem.conf.sample and name it mem.conf. Examples are as follows:

[[inputs.mem]]
  ##(optional) collect interval, default is 10 seconds
  interval = '10s'

[inputs.mem.tags]
  # some_tag = "some_value"
  # more_tag = "some_other_value"

Once configured, restart DataKit.

Can be turned on by ConfigMap Injection Collector Configuration or Config ENV_DATAKIT_INPUTS .

Can also be turned on by environment variables, (needs to be added as the default collector in ENV_DEFAULT_ENABLED_INPUTS):

  • ENV_INPUT_MEM_INTERVAL

    Collect interval

    Type: Duration

    input.conf: interval

    Default: 10s

  • ENV_INPUT_MEM_TAGS

    Customize tags. If there is a tag with the same name in the configuration file, it will be overwritten

    Type: Map

    input.conf: tags

    Example: tag1=value1,tag2=value2

Metric

For all of the following data collections, a global tag named host is appended by default (the tag value is the host name of the DataKit), or other tags can be specified in the configuration by [inputs.mem.tags]:

 [inputs.mem.tags]
  # some_tag = "some_value"
  # more_tag = "some_other_value"
  # ...

mem

  • tag
Tag Description
host System hostname.
  • metric list
Metric Description Type Unit
active Memory that has been used more recently and usually not reclaimed unless absolutely necessary. (Darwin, Linux) int B
available Amount of available memory. int B
available_percent Available memory percent. float percent
buffered Buffered. (Linux) int B
cached In-memory cache for files read from the disk. (Linux) int B
commit_limit This is the total amount of memory currently available to be allocated on the system. (Linux) int B
committed_as The amount of memory presently allocated on the system. (Linux) int B
dirty Memory which is waiting to get written back to the disk. (Linux) int B
free Amount of free memory. (Darwin, Linux) int B
high_free Amount of free high memory. (Linux) int B
high_total Total amount of high memory. (Linux) int B
huge_page_total The size of the pool of huge pages. (Linux) int count
huge_pages_free The number of huge pages in the pool that are not yet allocated. (Linux) int count
huge_pages_size The size of huge pages. (Linux) int B
inactive Memory which has been less recently used. It is more eligible to be reclaimed for other purposes. (Darwin, Linux) int B
low_free Amount of free low memory. (Linux) int B
low_total Total amount of low memory. (Linux) int B
mapped Files which have been mapped into memory, such as libraries. (Linux) int B
page_tables Amount of memory dedicated to the lowest level of page tables. (Linux) int B
shared Amount of shared memory. (Linux) int B
slab In-kernel data structures cache. (Linux) int B
sreclaimable Part of Slab, that might be reclaimed, such as caches. (Linux) int B
sunreclaim Part of Slab, that cannot be reclaimed on memory pressure. (Linux) int B
swap_cached Memory that once was swapped out, is swapped back in but still also is in the swap file. (Linux) int B
swap_free Amount of swap space that is currently unused. (Linux) int B
swap_total Total amount of swap space available. (Linux) int B
total Total amount of memory. int B
used Amount of used memory. int B
used_percent Used memory percent. float percent
vmalloc_chunk Largest contiguous block of vmalloc area which is free. (Linux) int B
vmalloc_total Total size of vmalloc memory area. (Linux) int B
vmalloc_used Amount of vmalloc area which is used. (Linux) int B
wired Wired. (Darwin) int B
write_back Memory which is actively being written back to the disk. (Linux) int B
write_back_tmp Memory used by FUSE for temporary write back buffers. (Linux) int B

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