wind.vpl mute.vpl > Fig/denmark.vpl 0.06user 0.03system 0:00.06elapsed 135%CPU (0avgtext+0avgdata 444416maxresident)k 0inputs+0outputs (1739major+0minor)pagefaults 0swaps </bash> In other words, every shell command is preceded by the Unix time utility to measure the CPU time of the process. Running the example above with CHECKPAR=y , we will not see any difference. Suppose, however, that