Script for testing CPU values and rules

Monitoring Best Practice
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1

I needed a script that would set a CPU usage value to a certain percent to test some static and forecasting alerts. All right for this to openAI. This script takes a parameter 1-100 and the script will attempt to keep the CPU value at that level.

#!/bin/bash

# Check if usage percentage is passed as an argument
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <cpu_usage_percentage>"
    exit 1
fi

# Desired CPU usage percentage
cpu_usage=$1

# Calculate sleep duration based on desired CPU usage
sleep_duration=$(awk "BEGIN {print (1 - $cpu_usage / 100) / ($cpu_usage / 100)}")

# Function to consume CPU up to the specified percentage
limit_cpu_usage() {
    while true; do
        # Start time
        start=$(date +%s.%N)

        # Busy loop for the duration of one second
        end=$(echo "$start + 1" | bc)
        while true; do
            current=$(date +%s.%N)
            check=$(echo "$current < $end" | bc)
            if [ "$check" -eq 0 ]; then
                break
            fi
            : # No-op
        done

        # Sleep for the calculated duration
        sleep $sleep_duration
    done
}

# Run the function in the foreground
limit_cpu_usage

# Run the function in the background
# limit_cpu_usage &
1 Like
2

As an example of how I am using the script, we are running some tests on zooming in and out in our new charting package. We combine the severity timeline with the metric value.

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image1576×1100 50.9 KB

3

Look good, but here’s your next challenge (tongue firmly in cheek):

1 Like
4

That looks like exactly what a 896 core machine should be used for!