bash script that runs wrk2 against url with rate parameter from 1000 to 20000. The output is a table rate vs latency

benchmark_latency.sh

#!/bin/bash

# Check if wrk2 is installed
if ! command -v wrk2 &> /dev/null; then
    echo "wrk2 is not installed. Please install it: https://github.com/giltene/wrk2"
    exit 1
fi

# Check if an argument (URL) is provided
if [ -z "$1" ]; then
    echo "Usage: $0 <url>"
    exit 1
fi

URL="$1"

# Headers for the output table
printf "%-10s %-10s\n" "Rate" "Latency (ms)"
echo "----------------------"

# Loop through rates from 1000 to 20000 with steps of 1000
for rate in {1000..20000..1000}; do
    result=$(wrk2 -t4 -c100 -d30s -R${rate} -L ${URL} | grep Latency)
    latency=$(echo $result | awk '{print $2}')
    printf "%-10s %-10s\n" "$rate" "$latency"
done