rosenrodt commented on issue #8966: NaiveEngine asynchronous error in multi-threading URL: https://github.com/apache/incubator-mxnet/issues/8966#issuecomment-417190004 It seems like the internal memory pool tries to call `cudaFree()` on the same resource assigned to two or more MXNet instances when running Naive Engine. The memory pool is supposed to be thread-local singleton so each MXNet instance spawned by each thread does not contend with each other the same resource, but when running in Naive Engine it apparently is not the case. I get all sorts of errors like CUDA invalid pointer error and eventually cuBLAS failure
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