Better multiple communicators support by eliminating cudaFree #194
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Use a global ncclGdrTestBuf pointer array to save an dynamically testing buffer for GDR Support detection. This will avoid 'cudaFree' be immediately called during multi-thread running scenario, which might cause deadlock for other collective kernels.
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Use a global ncclGdrTestBuf pointer array to save an dynamically
testing buffer for GDR Support detection. This will avoid 'cudaFree'
be immediately called during multi-thread running scenario, which
might cause deadlock for other collective kernels.
More detail could be seen here.