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Monitoring-Logging/Tools/stress-ng.md

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+# Stress-ng: Hardware Stress Testing Tool
+
+`stress-ng` is a powerful tool for performing various stress tests on your hardware components, including CPU, memory, and I/O. This utility helps in assessing hardware stability under heavy loads, making it useful for benchmarking or diagnosing hardware issues.
+
+## Table of Contents
+- [Installation](#installation)
+- [CPU Stress Testing](#cpu-stress-testing)
+- [Memory Stress Testing](#memory-stress-testing)
+- [I/O Stress Testing](#io-stress-testing)
+- [Full System Stress Testing](#full-system-stress-testing)
+
+### Installation
+
+To install `stress-ng` on Ubuntu or other Debian-based systems, run:
+```bash
+sudo apt install stress-ng
+```
+
+---
+
+## CPU Stress Testing
+
+Use `stress-ng` to test CPU performance under different configurations:
+
+### 1. Run a CPU Test with a Specified Number of Threads
+
+You can specify the number of threads to use during a CPU stress test. Using `0` as the thread number utilizes all available CPU cores, maximizing CPU usage.
+
+```bash
+stress-ng --cpu <thread-number>
+```
+
+**Example:**
+```bash
+stress-ng --cpu 4
+```
+This command uses 4 CPU threads to run the stress test.
+
+### 2. Run a CPU Test for a Specified Duration
+
+Specify both the number of CPU threads and a time limit for the test.
+
+```bash
+stress-ng --cpu <thread-number> --timeout <seconds>
+```
+
+**Example:**
+```bash
+stress-ng --cpu 2 --timeout 60s
+```
+This command uses 2 CPU threads and runs the test for 60 seconds.
+
+### 3. Run a CPU Load Test at a Specific Percentage
+
+You can control the CPU load by specifying a percentage, which is helpful for testing different levels of CPU usage.
+
+```bash
+stress-ng --cpu-load <percentage>
+```
+
+**Example:**
+```bash
+stress-ng --cpu-load 50
+```
+This command keeps the CPU load at approximately 50%.
+
+---
+
+## Memory Stress Testing
+
+Stress test the system's memory by allocating and releasing blocks of memory. This can help evaluate memory stability and performance.
+
+### 1. Basic Memory Stress Test
+
+Run a memory test with a specified number of workers (processes) that continuously allocate and deallocate memory.
+
+```bash
+stress-ng --vm <workers>
+```
+
+**Example:**
+```bash
+stress-ng --vm 2
+```
+This command uses 2 workers to perform memory stress testing.
+
+### 2. Run a Timed Memory Stress Test
+
+Add a timeout option to run a memory test for a specific duration.
+
+```bash
+stress-ng --vm <workers> --timeout <seconds>
+```
+
+**Example:**
+```bash
+stress-ng --vm 2 --timeout 60s
+```
+This command uses 2 memory workers and runs the test for 60 seconds.
+
+### 3. Allocate a Specific Amount of Memory
+
+Specify the amount of memory to allocate per worker. 
+
+```bash
+stress-ng --vm <workers> --vm-bytes <size>
+```
+
+**Example:**
+```bash
+stress-ng --vm 1 --vm-bytes 512M
+```
+This command allocates 512 MB of memory for one worker.
+
+---
+
+## I/O Stress Testing
+
+I/O testing evaluates the performance of your system’s storage by reading and writing files repeatedly. This is useful for identifying storage bottlenecks and stress-testing the I/O subsystem.
+
+### 1. Basic I/O Stress Test
+
+Run an I/O test with a specified number of workers performing file operations.
+
+```bash
+stress-ng --io <workers>
+```
+
+**Example:**
+```bash
+stress-ng --io 4
+```
+This command runs 4 I/O workers, continuously reading and writing data to test disk performance.
+
+### 2. Timed I/O Stress Test
+
+Specify a timeout to limit the duration of the I/O stress test.
+
+```bash
+stress-ng --io <workers> --timeout <seconds>
+```
+
+**Example:**
+```bash
+stress-ng --io 4 --timeout 60s
+```
+This command runs the I/O stress test for 60 seconds with 4 workers.
+
+---
+
+## Full System Stress Testing
+
+For a comprehensive stress test, `stress-ng` allows you to stress multiple components at once, such as CPU, memory, and I/O. This puts a combined load on the system to simulate heavy usage conditions.
+
+```bash
+stress-ng --all --timeout <seconds>
+```
+
+**Example:**
+```bash
+stress-ng --all --timeout 10s
+```
+This command runs a 10-second full system stress test, targeting all components that `stress-ng` supports.
+