time command
Lee Woodbury
leland at cs.columbia.edu
Fri Apr 13 04:45:25 AEST 1990
In article <3556 at zorba.Tynan.COM> drich at klaatu.lanl.gov (David Rich) writes:
>I've not run across a reasonable description of
>the output of the time command in unix doc that
>I've seen. What do these numbers mean? In general,
>what do they say about an application?
>
>e.g., 46.6u 1.8s 0:50 96% 0+1716k 5+0io 13pf+0w
The 'time' command is part of the shell (in your case, the csh; the
sh's and ksh's time has a different output format). The csh(1)
man page provides explication of the above format, but to summarize,
the above example indicates:
tag # unit description
----- ---- ---------- --------------------------------------------
%U 46.6 seconds CPU time devoted to the user's process.
%S 1.8 seconds CPU time consumed by the kernel on behalf of
of the user's process.
%E 50 seconds Elapsed (wallclock) time for the command.
%P 96 percent ( %U + %S ) / %E expressed as a percentage.
%X 0 Kb Average amount of shared memory used.
%D 1716 Kb Average amount of unshared data space used.
%I 5 - Number of block input operations.
%O 0 - Number of block ouput operations.
%F 13 - Number of page faults.
%W 0 - Number of swaps.
Leland Woodbury
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