Add --threads 4 to extra_compile_args["nvcc"]
#1251
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ghost
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As per title to speed up apex build.
The main change is
.
With this, in my local environment, apex build got improved from 15m45s to10m49s.
Build command:
CC=/usr/bin/gcc-9 CXX=/usr/bin/g++-9 TORCH_CUDA_ARCH_LIST="7.0 7.5 8.0 8.6+PTX" CFLAGS="-g0" pip install -q --no-cache-dir --disable-pip-version-check --global-option="--cpp_ext" --global-option="--cuda_ext" --global-option="--bnp" --global-option="--xentropy" --global-option="--deprecated_fused_adam" --global-option="--deprecated_fused_lamb" --global-option="--fast_multihead_attn" --global-option="--distributed_lamb" --global-option="--fast_layer_norm" --global-option="--transducer" --global-option="--distributed_adam" --global-option="--fmha" --global-option="--fast_bottleneck" .cc @xwang233 @ptrblck