espp/monitor

1.3.6

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uploaded 9 hours ago
System Monitor component for ESP-IDF: heap and task statistics, plus a framed stream service (MonitorService) that serves them over USB / WebUSB / Web Serial
Readme Dependencies 5 Dependents 0 Examples 1 Versions 59

Readme

# Monitor Component

[![Badge](https://components.espressif.com/components/espp/monitor/badge.svg)](https://components.espressif.com/components/espp/monitor)

The `monitor` component provides utilities for monitoring various aspects of the
system.

<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
**Table of Contents**

- [Monitor Component](#monitor-component)
  - [Task Monitor](#task-monitor)
  - [Monitor Service](#monitor-service)
  - [Example](#example)

<!-- markdown-toc end -->

## Task Monitor

The task monitor provides the ability to use the FreeRTOS trace facility to
output information about the CPU utilization (%), stack high water mark (bytes),
and priority of all the tasks running on the system.

There is an associated [task-monitor](https://github.com/esp-cpp/task-monitor)
python gui which can parse the output of this component and render it as a chart
or into a table for visualization.

## Monitor Service

`espp::MonitorService` (`monitor_service.hpp`) serves the heap-region and task
statistics over any framed byte stream as an `espp::Dispatcher` module
(`espp.monitor` v1, module 8 by default): `GET_HEAP` (one record per configured
`MALLOC_CAP_*` region), `GET_TASKS` (the `TaskMonitor` table; needs
`CONFIG_FREERTOS_USE_TRACE_FACILITY` + `CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS`;
capped, like `GET_HEAP`, so the whole frame fits `Config::max_frame_bytes`, 4096 by default)
and `SET_STREAM` (periodic HEAP / TASKS events). Replies echo the request
frame's correlation id, so a host can pair them and drop stale ones; streamed
events carry none. The wire codec lives in
`include/detail/monitor_protocol.hpp` (host-buildable, tested by
`test/monitor_host_test.cpp`). The hosted
[system console](https://esp-cpp.github.io/espp/apps/system_console.html) web
app renders heap gauges and a live task table from it; the
[system](../system) component's example exposes it over USB together with
`espp::SystemService`:

<img width="946" alt="espp System Console streaming the task table from MonitorService (name, CPU %, stack high-water mark, priority, core)" src="https://github.com/user-attachments/assets/c2c962bf-debb-44c7-96a7-95527218d953" />

## Example

This example shows how to use the `monitor` component to monitor the executing
tasks.

Links

Supports all targets

Maintainer

  • William Emfinger <waemfinger@gmail.com>

Tags

To add this component to your project, run:

idf.py add-dependency "espp/monitor^1.3.6"

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