optimize the function to get the complementary nucleotide

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
use a cache to avoid false sharing of the processor cache line

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
use a cache for workers and a cache for messages

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>