CUBLAS_STATUS_INVALID_VALUE (1) cuda runtime_error ai_generated true

RuntimeError: CUBLAS_STATUS_INVALID_VALUE when calling cublasGemmStridedBatchedEx with batch_count=0

ID: cuda/cublas-batched-gemm-batch-count-zero

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95%Fix Rate
87%Confidence
1Evidence
2023-02-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
CUDA 11.0 active — — —
CUDA 12.0 active — — —
cuBLAS 11.10 active — — —
cuBLAS 12.1 active — — —

Root Cause

cuBLAS batched GEMM routines require batch_count >= 1; a zero batch count is an invalid argument that cuBLAS rejects immediately with CUBLAS_STATUS_INVALID_VALUE.

generic

中文

cuBLAS 批处理 GEMM 例程要求 batch_count >= 1；零批处理计数是无效参数，cuBLAS 会立即拒绝并返回 CUBLAS_STATUS_INVALID_VALUE。

Official Documentation

https://docs.nvidia.com/cuda/cublas/index.html#cublas-gemm-batched-ex

Workarounds

  1. 95% success Guard the cuBLAS call with a conditional: only call when batch_count > 0. If batch_count is 0, skip the GEMM entirely (the result is an empty array). 
    Guard the cuBLAS call with a conditional: only call when batch_count > 0. If batch_count is 0, skip the GEMM entirely (the result is an empty array).
  2. 90% success Ensure batch_count is computed correctly, e.g., from the size of a vector. Example: int batch_count = (int)matrices.size(); if (batch_count == 0) return; 
    Ensure batch_count is computed correctly, e.g., from the size of a vector. Example: int batch_count = (int)matrices.size(); if (batch_count == 0) return;

中文步骤

  1. Guard the cuBLAS call with a conditional: only call when batch_count > 0. If batch_count is 0, skip the GEMM entirely (the result is an empty array).
  2. Ensure batch_count is computed correctly, e.g., from the size of a vector. Example: int batch_count = (int)matrices.size(); if (batch_count == 0) return;

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Setting batch_count to a negative value (e.g., -1) causes a different error (CUBLAS_STATUS_NOT_INITIALIZED or segfault) and does not solve the problem.

  2. 80% fail

    Wrapping the call in a try-catch and ignoring the error leaves the operation undone; subsequent code expecting the GEMM result will produce garbage or crash.