lepreau (08/04/82)
The csh man entry does not document the "time" command and not every
field's meaning is obvious, as Alan Watt noted. I finally stumbled
across the doc in the csh tutorial, section 2.8. It should be added to
the man entry. Here's the slightly edited info from the tut (in
/usr/doc/csh/csh.2, search for "swap").
The time command can be used to cause a command to be timed no matter
how much CPU time it takes. Thus
% time cp /etc/rc /usr/bill/rc
0.0u 0.1s 0:01 8% 2+1k 3+2io 1pf+0w
indicates that the cp command used a negligible amount of user time
(u) and about 1/10th of a system time (s); the elapsed time was 1
second (0:01), there was an average memory usage of 2k bytes of
program space and 1k bytes of data space over the cpu time involved
(2+1k); the program did three disk reads and two disk writes
(3+2io), and took one page fault and was not swapped (1pf+0w). The
percentage `8%' indicates that over the period when it was active the
command `cp' used an average of 8 percent of the available CPU cycles
of the machine.
-Jay Lepreau