serial 
mpmc_pair 2 1 0
upmc_trypop 2 1 0
mpmc_trypop 2 1 0
mpmc_trypair 2 1 0
mpmc_pop 2 1 0
upmc_pop 2 1 0
mpnc_push 2 1 0
mpmc_push 2 1 0
upmc_push 2 1 0
mpmc_trypush 2 1 0
upmc_trypush 2 1 0