support fractions in --memory-limit (#498)
support fractions in --memory-limit (#498)


amosonn/distributed,broxtronix/distributed,blaze/distributed,dask/distributed,mrocklin/distributed,dask/distributed,broxtronix/distributed,blaze/distributed,mrocklin/distributed,broxtronix/distributed,amosonn/distributed,mrocklin/distributed,dask/distributed,amosonn/distributed,dask/distributed