"""Quick test: allocate more RAM than available and verify swap catches it."""

import numpy as np
import psutil

def main():
    mem = psutil.virtual_memory()
    swap = psutil.swap_memory()
    print(f"RAM:  {mem.total / 1e9:.0f}GB total, {mem.available / 1e9:.0f}GB available")
    print(f"Swap: {swap.total / 1e9:.0f}GB total, {swap.used / 1e9:.0f}GB used")
    print()

    target_gb = 300
    chunk_gb = 10
    chunks = []

    print(f"Allocating {target_gb}GB in {chunk_gb}GB chunks...")
    for i in range(target_gb // chunk_gb):
        chunks.append(np.ones(int(chunk_gb * 1e9 / 8), dtype=np.float64))
        allocated = (i + 1) * chunk_gb
        swap_now = psutil.swap_memory()
        mem_now = psutil.virtual_memory()
        print(f"  {allocated:>4}GB allocated | RAM used: {mem_now.used / 1e9:.1f}GB | swap used: {swap_now.used / 1e9:.1f}GB")

    print()
    print("SUCCESS: allocated 300GB without OOM. Swap is working.")

    del chunks

if __name__ == "__main__":
    main()