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diff --git a/collectors/proc.plugin/integrations/pressure_stall_information.md b/collectors/proc.plugin/integrations/pressure_stall_information.md new file mode 100644 index 000000000..e590a8d38 --- /dev/null +++ b/collectors/proc.plugin/integrations/pressure_stall_information.md @@ -0,0 +1,128 @@ +<!--startmeta +custom_edit_url: "https://github.com/netdata/netdata/edit/master/collectors/proc.plugin/integrations/pressure_stall_information.md" +meta_yaml: "https://github.com/netdata/netdata/edit/master/collectors/proc.plugin/metadata.yaml" +sidebar_label: "Pressure Stall Information" +learn_status: "Published" +learn_rel_path: "Data Collection/Linux Systems/Pressure" +message: "DO NOT EDIT THIS FILE DIRECTLY, IT IS GENERATED BY THE COLLECTOR'S metadata.yaml FILE" +endmeta--> + +# Pressure Stall Information + + +<img src="https://netdata.cloud/img/linuxserver.svg" width="150"/> + + +Plugin: proc.plugin +Module: /proc/pressure + +<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" /> + +## Overview + +Introduced in Linux kernel 4.20, `/proc/pressure` provides information about system pressure stall information +(PSI). PSI is a feature that allows the system to track the amount of time the system is stalled due to +resource contention, such as CPU, memory, or I/O. + +The collectors monitored 3 separate files for CPU, memory, and I/O: + +- **cpu**: Tracks the amount of time tasks are stalled due to CPU contention. +- **memory**: Tracks the amount of time tasks are stalled due to memory contention. +- **io**: Tracks the amount of time tasks are stalled due to I/O contention. +- **irq**: Tracks the amount of time tasks are stalled due to IRQ contention. + +Each of them provides metrics for stall time over the last 10 seconds, 1 minute, 5 minutes, and 15 minutes. + +Monitoring the /proc/pressure files can provide important insights into system performance and capacity planning: + +- **Identifying resource contention**: If these metrics are consistently high, it indicates that tasks are + frequently being stalled due to lack of resources, which can significantly degrade system performance. + +- **Troubleshooting performance issues**: If a system is experiencing performance issues, these metrics can + help identify whether resource contention is the cause. + +- **Capacity planning**: By monitoring these metrics over time, you can understand trends in resource + utilization and make informed decisions about when to add more resources to your system. + + + + +This collector is supported on all platforms. + +This collector only supports collecting metrics from a single instance of this integration. + + +### Default Behavior + +#### Auto-Detection + +This integration doesn't support auto-detection. + +#### Limits + +The default configuration for this integration does not impose any limits on data collection. + +#### Performance Impact + +The default configuration for this integration is not expected to impose a significant performance impact on the system. + + +## Metrics + +Metrics grouped by *scope*. + +The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels. + + + +### Per Pressure Stall Information instance + + + +This scope has no labels. + +Metrics: + +| Metric | Dimensions | Unit | +|:------|:----------|:----| +| system.cpu_some_pressure | some10, some60, some300 | percentage | +| system.cpu_some_pressure_stall_time | time | ms | +| system.cpu_full_pressure | some10, some60, some300 | percentage | +| system.cpu_full_pressure_stall_time | time | ms | +| system.memory_some_pressure | some10, some60, some300 | percentage | +| system.memory_some_pressure_stall_time | time | ms | +| system.memory_full_pressure | some10, some60, some300 | percentage | +| system.memory_full_pressure_stall_time | time | ms | +| system.io_some_pressure | some10, some60, some300 | percentage | +| system.io_some_pressure_stall_time | time | ms | +| system.io_full_pressure | some10, some60, some300 | percentage | +| system.io_full_pressure_stall_time | time | ms | + + + +## Alerts + +There are no alerts configured by default for this integration. + + +## Setup + +### Prerequisites + +No action required. + +### Configuration + +#### File + +There is no configuration file. +#### Options + + + +There are no configuration options. + +#### Examples +There are no configuration examples. + + |