Fix cudaErrorContextAlreadyCurrent: Context Already Active

Overview

cudaErrorContextAlreadyCurrent occurs when setting a context that's already the current context.

Error Messages

CUDA error: context already current
cudaErrorContextAlreadyCurrent

Common Causes

• •Setting current context again
• •Not checking current context
• •Redundant context switches

Solutions

CUcontext current;
cuCtxGetCurrent(&current);
if (current != desired) {
    cuCtxSetCurrent(desired);
}

Prevention Tips

• ✓Track current context
• ✓This error is informational, usually harmless

Code Examples

Before (Problematic)

Already current.

cuCtxSetCurrent(ctx);
cuCtxSetCurrent(ctx);  // Redundant

After (Fixed)

Check first.

CUcontext cur; cuCtxGetCurrent(&cur);
if (cur != ctx) cuCtxSetCurrent(ctx);

Frequently Asked Questions

Related Errors

Need help debugging CUDA errors? Download RightNow AI for intelligent error analysis and optimization suggestions.