Fix cudaErrorDevicesUnavailable: All GPUs In Use

Overview

cudaErrorDevicesUnavailable occurs when all GPUs are in exclusive mode and occupied.

Error Messages

CUDA error: all devices unavailable
cudaErrorDevicesUnavailable

Common Causes

• •GPUs in exclusive compute mode
• •Other processes holding GPUs
• •Compute mode misconfiguration

Solutions

nvidia-smi -q -d COMPUTE

sudo nvidia-smi -c DEFAULT

Prevention Tips

• ✓Use DEFAULT compute mode for development
• ✓Use job scheduler for exclusive access

Code Examples

Before (Problematic)

Cannot access.

cudaSetDevice(0);  // Fails if exclusive and in use

After (Fixed)

Try all devices.

for (int i = 0; i < count; i++) if (cudaSetDevice(i) == cudaSuccess) break;

Frequently Asked Questions

Related Errors

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