# 1. THE MOST CRITICAL — process fd limit is only 256!
sudo launchctl limit maxfiles 65536 200000

# Then restart your terminal or run:
ulimit -n 65536

# Verify
ulimit -n  # must show 65536

# 2. TCP listen backlog
sudo sysctl -w kern.ipc.somaxconn=8192

# 3. Reduce TIME_WAIT holddown
sudo sysctl -w net.inet.tcp.msl=1000

# 4. Widen ephemeral port range for load tester
sudo sysctl -w net.inet.ip.portrange.first=1024

# Verify all
echo "somaxconn:  $(sysctl -n kern.ipc.somaxconn)"
echo "msl:        $(sysctl -n net.inet.tcp.msl)"
echo "ports:      $(sysctl -n net.inet.ip.portrange.first)-$(sysctl -n net.inet.ip.portrange.last)"
echo "fd limit:   $(ulimit -n)"



# In a second terminal while the test runs
watch -n1 'netstat -an | grep 8080 | grep -c ESTABLISHED'



# Option 1: install it
brew install watch
watch -n1 'netstat -an | grep 8080 | grep -c ESTABLISHED'

# Option 2: pure shell loop (no install needed)
while true; do
    clear
    echo "=== $(date) ==="
    echo "ESTABLISHED: $(netstat -an | grep 8080 | grep -c ESTABLISHED)"
    echo "TIME_WAIT:   $(netstat -an | grep 8080 | grep -c TIME_WAIT)"
    echo "CLOSE_WAIT:  $(netstat -an | grep 8080 | grep -c CLOSE_WAIT)"
    echo "SYN_RCVD:    $(netstat -an | grep 8080 | grep -c SYN_RCVD)"
    echo "Total fds:   $(lsof -p $(pgrep broadcast_server) 2>/dev/null | wc -l)"
    sleep 1
done


SERVER_PID=$(pgrep broadcast_server)
while true; do
    clear
    echo "=== $(date) ==="
    echo "--- Network ---"
    echo "ESTABLISHED: $(netstat -an | grep 8080 | grep -c ESTABLISHED)"
    echo "TIME_WAIT:   $(netstat -an | grep 8080 | grep -c TIME_WAIT)"
    echo "CLOSE_WAIT:  $(netstat -an | grep 8080 | grep -c CLOSE_WAIT)"
    echo "SYN_RCVD:    $(netstat -an | grep 8080 | grep -c SYN_RCVD)"
    echo "--- Process (PID: $SERVER_PID) ---"
    FD_COUNT=$(lsof -p $SERVER_PID 2>/dev/null | wc -l)
    echo "Open fds:    $FD_COUNT / 65536"
    echo "--- System ---"
    echo "Ports in use: $(netstat -an | grep -c tcp)"
    sleep 1
done


# CPU profiling with flamegraph
cargo install flamegraph
cargo flamegraph --bin broadcast_server

# Memory profiling
cargo install cargo-instruments
cargo instruments -t Allocations --features b_server --bin broadcast_server

# Time-based profiling on macOS
cargo instruments -t "Time Profiler" --features b_server --bin broadcast_server