bcache_benchmarker.zsh

bcache_benchmarker.zsh

#!/bin/zsh

# Define paths and test file size
TEST_FILE_SIZE=1024  # Size in MB (1G = 1024MB)
TEST_FILE_PATH_ROOT="/testfile"
TEST_FILE_PATH_HDD="/hdd/testfile"

# Clear bcache stats
echo "Clearing bcache stats..."
echo 1 | sudo tee /sys/block/bcache0/bcache/clear_stats > /dev/null

# Create test files
echo "Creating test files..."
sudo dd if=/dev/zero of=$TEST_FILE_PATH_ROOT bs=1M count=$TEST_FILE_SIZE status=progress
sudo dd if=/dev/zero of=$TEST_FILE_PATH_HDD bs=1M count=$TEST_FILE_SIZE status=progress

# Measure performance without cache
echo "Measuring performance without cache..."
sudo hdparm -t /dev/sda4
sudo hdparm -t /dev/sdb2

# Read files multiple times to populate cache
echo "Reading files to populate cache..."
for i in {1..5}; do
    sudo dd if=$TEST_FILE_PATH_ROOT of=/dev/null bs=1M status=progress
    sudo dd if=$TEST_FILE_PATH_HDD of=/dev/null bs=1M status=progress
done

# Measure performance with cache
echo "Measuring performance with cache..."
sudo hdparm -t /dev/sda4
sudo hdparm -t /dev/sdb2

# Clean up test files
echo "Cleaning up test files..."
sudo rm -f $TEST_FILE_PATH_ROOT $TEST_FILE_PATH_HDD

echo "Performance test completed."