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# Performance Insights 的计数器指标
<a name="performance-insights-counter-metrics"></a>

计数器指标是 Performance Insights 控制面板中的操作系统指标。为帮助确定和分析性能问题，您可将计数器指标与数据库负载相关联。

## Performance Insights 操作系统计数器
<a name="performance-insights-counter-metrics-counters"></a>

以下操作系统计数器可用于 Amazon DocumentDB Performance Insights。


| 计数器 | 类型 | 指标 | 
| --- | --- | --- | 
| active | memory | os.memory.active | 
| buffers | memory | os.memory.buffers | 
| cached | memory | os.memory.cached | 
| dirty | memory | os.memory.dirty | 
| free | memory | os.memory.free | 
| inactive | memory | os.memory.inactive | 
| mapped | memory | os.memory.mapped | 
| pageTables | memory | os.memory.pageTables | 
| slab | memory | os.memory.slab | 
| total | memory | os.memory.total | 
| writeback | memory | os.memory.writeback | 
| idle | cpuUtilization | os.cpuUtilization.idle | 
| system | cpuUtilization | os.cpuUtilization.system | 
| total | cpuUtilization | os.cpuUtilization.total | 
| user | cpuUtilization | os.cpuUtilization.user | 
| wait | cpuUtilization | os.cpuUtilization.wait | 
| one | loadAverageMinute | os。 loadAverageMinute.one | 
| fifteen | loadAverageMinute | os。 loadAverageMinute。十五 | 
| five | loadAverageMinute | os。 loadAverageMinute.five | 
| cached | swap | os.swap.cached | 
| free | swap | os.swap.free | 
| in | swap | os.swap.in | 
| out | swap | os.swap.out | 
| total | swap | os.swap.total | 
| rx | network | os.network.rx | 
| tx | network | os.network.tx | 
| num VCPUs | general | os.general.num VCPUs |