内存
Memory 采集器用于收集系统内存信息，一些通用的指标如主机总内存、用的内存、已使用的内存等。
配置¶
成功安装 DataKit 并启动后，会默认开启 Memory 采集器，无需手动开启。
进入 DataKit 安装目录下的 conf.d/samples 目录，复制 mem.conf.sample 并命名为 mem.conf。示例如下：
[[inputs.mem]]
##(optional) collect interval, default is 10 seconds
interval = '10s'
[inputs.mem.tags]
# some_tag = "some_value"
# more_tag = "some_other_value"
配置好后，重启 DataKit 即可。
可通过 ConfigMap 方式注入采集器配置 或 配置 ENV_DATAKIT_INPUTS 开启采集器。
也支持以环境变量的方式修改配置参数（需要在 ENV_DEFAULT_ENABLED_INPUTS 中加为默认采集器）：
-
ENV_INPUT_MEM_INTERVAL
采集器重复间隔时长
字段类型: Duration
采集器配置字段:
interval默认值: 10s
-
ENV_INPUT_MEM_TAGS
自定义标签。如果配置文件有同名标签，将会覆盖它
字段类型: Map
采集器配置字段:
tags示例:
tag1=value1,tag2=value2
指标¶
以下所有数据采集，默认会追加名为 host 的全局 tag（tag 值为 DataKit 所在主机名），也可以在配置中通过 [inputs.mem.tags] 指定其它标签：
mem¶
| Tags & Fields | Description |
|---|---|
| host ( tag) |
System hostname. |
| active | Memory used recently and normally not reclaimed unless necessary. Darwin and Linux only. Type: int | (gauge) Unit: digital,B |
| available | Memory available for starting new applications without swapping, in bytes. Type: int | (gauge) Unit: digital,B |
| available_percent | Available memory percentage, calculated as available / total * 100.Type: float | (gauge) Unit: percent,percent |
| buffered | Memory used for kernel buffers. Linux only. Type: int | (gauge) Unit: digital,B |
| cached | Memory used for the filesystem page cache. Linux only. Type: int | (gauge) Unit: digital,B |
| commit_limit | Total memory currently available for allocation under the Linux overcommit policy. Linux only. Type: int | (gauge) Unit: digital,B |
| committed_as | Estimated memory committed to allocations on the system. Linux only. Type: int | (gauge) Unit: digital,B |
| dirty | Memory waiting to be written back to disk. Linux only. Type: int | (gauge) Unit: digital,B |
| free | Free memory in bytes. Darwin and Linux only. Type: int | (gauge) Unit: digital,B |
| high_free | Free high memory in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| high_total | Total high memory in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| huge_pages_free | Number of huge pages in the pool that are not allocated. Linux only. Type: int | (gauge) Unit: count |
| huge_pages_size | Huge page size in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| huge_pages_total | Total number of huge pages in the pool. Linux only. Type: int | (gauge) Unit: count |
| inactive | Memory used less recently and more eligible for reclaim. Darwin and Linux only. Type: int | (gauge) Unit: digital,B |
| low_free | Free low memory in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| low_total | Total low memory in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| mapped | Memory used for mapped files such as libraries. Linux only. Type: int | (gauge) Unit: digital,B |
| page_tables | Memory used for the lowest level of page tables. Linux only. Type: int | (gauge) Unit: digital,B |
| shared | Shared memory in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| slab | Memory used by in-kernel data structure caches. Linux only. Type: int | (gauge) Unit: digital,B |
| sreclaimable | Reclaimable part of slab memory, such as caches. Linux only. Type: int | (gauge) Unit: digital,B |
| sunreclaim | Unreclaimable part of slab memory. Linux only. Type: int | (gauge) Unit: digital,B |
| swap_cached | Memory that was swapped out, swapped back in, and still also exists in swap. Linux only. Type: int | (gauge) Unit: digital,B |
| swap_free | Unused swap space in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| swap_total | Total swap space in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| total | Total physical memory in bytes. Type: int | (gauge) Unit: digital,B |
| used | Used physical memory in bytes. Type: int | (gauge) Unit: digital,B |
| used_percent | Used memory percentage, calculated as used / total * 100.Type: float | (gauge) Unit: percent,percent |
| vmalloc_chunk | Largest contiguous free block in the vmalloc area. Linux only. Type: int | (gauge) Unit: digital,B |
| vmalloc_total | Total size of the vmalloc area in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| vmalloc_used | Used vmalloc area in bytes. Linux only. Type: int | (gauge) Unit: digital,B |
| wired | Wired memory that cannot be paged out. Darwin only. Type: int | (gauge) Unit: digital,B |
| write_back | Memory actively being written back to disk. Linux only. Type: int | (gauge) Unit: digital,B |
| write_back_tmp | Memory used by FUSE for temporary writeback buffers. Linux only. Type: int | (gauge) Unit: digital,B |