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fix: say why Int4GroupwiseGemmPluginV2 cannot execute when its kernels are absent #209

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fix: say why Int4GroupwiseGemmPluginV2 cannot execute when its kernels are absent #209

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13 changes: 13 additions & 0 deletions cpp/plugins/int4GroupwiseGemmPluginV2/int4GroupwiseGemmPluginV2.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -408,6 +408,19 @@ int32_t Int4GroupwiseGemmPluginV2::enqueue(PluginTensorDesc const* inputDesc, Pl
return cuteDslInt4GemmLaunch(v, inputs[0], inputs[1], inputs[2], outputs[0],
(v.splitK > 1) ? mLockWorkspace : nullptr, M, mGemmN, mGemmK, /*swizzle=*/1, stream);
#else
// The CuTe DSL INT4 kernels are not in this build, so there is nothing to dispatch to.
// Without a message the only symptom is "Failed to enqueue status -1" at inference time,
// long after the plugin registered, the engine built and the runtime loaded -- none of
// which fail. Log once rather than per enqueue.
static std::once_flag disabledKernelsWarning;
std::call_once(disabledKernelsWarning,
[]
{
LOG_ERROR(
"Int4GroupwiseGemmPluginV2: this build has no CuTe DSL INT4 kernels, so the plugin cannot "
"execute. Reconfigure with -DENABLE_CUTE_DSL=\"fmha;int4_fp16_gemm\" -- the default is "
"\"fmha\" alone, which omits the INT4 GEMM group -- and rebuild.");
});
return -1;
#endif
}
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