Fix cudaErrorGraphExecUpdateFailure: Graph Update Failed

Overview

cudaErrorGraphExecUpdateFailure occurs when updating a CUDA graph executable with incompatible changes.

Error Messages

CUDA error: graph exec update failure
cudaErrorGraphExecUpdateFailure

Common Causes

• •Topology changed
• •Node types changed
• •Incompatible parameter update
• •Dependencies modified

Solutions

cudaGraphNode_t errorNode;
cudaGraphExecUpdateResult updateResult;
cudaGraphExecUpdate(graphExec, graph, &errorNode, &updateResult);
if (updateResult != cudaGraphExecUpdateSuccess) {
    // Recreate graph exec
    cudaGraphExecDestroy(graphExec);
    cudaGraphInstantiate(&graphExec, graph);
}

Prevention Tips

• ✓Only update compatible parameters
• ✓Recreate graph exec for topology changes

Code Examples

Before (Problematic)

Can't change structure.

// Changed graph topology
cudaGraphExecUpdate(exec, newGraph);  // Fails

After (Fixed)

Recreate for incompatible changes.

// Update failed, recreate
cudaGraphExecDestroy(exec);
cudaGraphInstantiate(&exec, newGraph);

Frequently Asked Questions

Related Errors

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