`time' command displays wrong %CPU

[Sven Sandberg]

Hello,
I'm using time version 1.7 on Linux Mandrake. It once gave me the
result:

45157.79user 3.50system 12:33:11elapsed 4%CPU (0avgtext+0avgdata
0maxresident)k 0inputs+0outputs (1760major+15244minor)pagefaults 0swaps

In the manpage, it says that %CPU is calculated as
(user+system)/elapsed. So the printed CPU usage is wrong, it should be
99.9%. This could be explained by the internal time being represented as
microseconds in a >32 bit int, but when calculating the %CPU it
truncates it to 32 bit unsigned at some step. If this is true, it
probably also just truncates the result rather than round it towards the
nearest integer (though this might be more a matter of taste than a
bug). (Sorry if this is a known or fixed bug, but I couldn't find any
bug list.)

-- 
Sven Sandberg    address@hidden    home.student.uu.se/svsa1977