Fix cudaErrorAlreadyMapped: Resource Already Mapped

Overview

cudaErrorAlreadyMapped occurs when mapping a resource that is already mapped.

Error Messages

CUDA error: already mapped
cudaErrorAlreadyMapped

Common Causes

• •Double map call
• •Map in loop without unmap
• •Missing state tracking

Solutions

if (!isMapped) {
    cudaGraphicsMapResources(1, &res, 0);
    isMapped = true;
}

Prevention Tips

• ✓Track mapped state
• ✓Use RAII wrapper

Code Examples

Before (Problematic)

Double mapping.

cudaGraphicsMapResources(1, &res, 0);
cudaGraphicsMapResources(1, &res, 0);  // Error!

After (Fixed)

State tracked.

if (!mapped) { cudaGraphicsMapResources(1, &res, 0); mapped = true; }

Frequently Asked Questions

Related Errors

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