Fix cudaErrorDeviceUninitialized: Device Not Initialized

Overview

cudaErrorDeviceUninitialized indicates CUDA operations were attempted before device initialization completed.

Error Messages

CUDA error: device uninitialized
cudaErrorDeviceUninitialized

Common Causes

• •Using CUDA before cudaSetDevice
• •Context destroyed prematurely
• •Driver reset

Solutions

cudaSetDevice(0);  // Initialize device
cudaFree(0);  // Explicit init trigger
// Now use CUDA

Prevention Tips

• ✓Initialize device at startup
• ✓Check return values

Code Examples

Before (Problematic)

Device not initialized.

cudaMemcpy(...);  // No init first

After (Fixed)

Initialize first.

cudaSetDevice(0);
cudaMemcpy(...);

Frequently Asked Questions

Related Errors

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