import torch
import time
import os
import sys

print(f'PyTorch: {torch.__version__}')
print(f'CUDA: {torch.cuda.is_available()}')
if torch.cuda.is_available():
    print(f'Device: {torch.cuda.get_device_name(0)}')
else:
    print('NO CUDA AVAILABLE')
    os._exit(1)

print()
tests = []

# Test 1: Small matmul
print('=== Test 1: Small matmul 256x256 fp32 ===')
try:
    a = torch.randn(256, 256, device='cuda', dtype=torch.float32)
    b = torch.randn(256, 256, device='cuda', dtype=torch.float32)
    torch.cuda.synchronize()
    t = time.time()
    for _ in range(10):
        c = torch.mm(a, b)
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('small_mm', True))
    del a, b, c
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('small_mm', False))

# Test 2: Medium matmul
print('=== Test 2: matmul 1024x1024 fp32 ===')
try:
    a = torch.randn(1024, 1024, device='cuda', dtype=torch.float32)
    b = torch.randn(1024, 1024, device='cuda', dtype=torch.float32)
    torch.cuda.synchronize()
    t = time.time()
    c = torch.mm(a, b)
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('med_mm', True))
    del a, b, c
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('med_mm', False))

# Test 3: fp16
print('=== Test 3: matmul 1024x1024 fp16 ===')
try:
    a = torch.randn(1024, 1024, device='cuda', dtype=torch.float16)
    b = torch.randn(1024, 1024, device='cuda', dtype=torch.float16)
    torch.cuda.synchronize()
    t = time.time()
    c = torch.mm(a, b)
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('fp16_mm', True))
    del a, b, c
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('fp16_mm', False))

# Test 4: Conv2d
print('=== Test 4: Conv2d 32ch fp32 ===')
try:
    conv = torch.nn.Conv2d(32, 32, 3, padding=1).cuda().float()
    x = torch.randn(1, 32, 32, 32, device='cuda', dtype=torch.float32)
    torch.cuda.synchronize()
    t = time.time()
    y = conv(x)
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('conv2d', True))
    del conv, x, y
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('conv2d', False))

# Test 5: BMM (attention-like)
print('=== Test 5: BMM 4x512x64 fp32 ===')
try:
    q = torch.randn(1, 4, 512, 64, device='cuda', dtype=torch.float32)
    k = torch.randn(1, 4, 512, 64, device='cuda', dtype=torch.float32)
    torch.cuda.synchronize()
    t = time.time()
    attn = torch.matmul(q, k.transpose(-2, -1))
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('bmm', True))
    del q, k, attn
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('bmm', False))

# Test 6: Linear (typical model layer)
print('=== Test 6: Linear 3072->3072 fp32 ===')
try:
    lin = torch.nn.Linear(3072, 3072).cuda().float()
    x = torch.randn(1, 256, 3072, device='cuda', dtype=torch.float32)
    torch.cuda.synchronize()
    t = time.time()
    y = lin(x)
    torch.cuda.synchronize()
    elapsed = time.time()-t
    print(f'  OK: {elapsed:.3f}s')
    tests.append(('linear', True))
    del lin, x, y
except Exception as e:
    print(f'  FAIL: {e}')
    tests.append(('linear', False))

print()
passed = sum(1 for _, ok in tests if ok)
print(f'=== {passed}/{len(tests)} tests passed ===')
sys.stdout.flush()
torch.cuda.synchronize()
os._exit(0)