limit thread queue to x2 number of threads
limit thread queue to x2 number of threads

moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder