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COMMENT(!MOD!
A module allowing profiling for shell functions.
!MOD!)
cindex(functions, profiling)
When loaded, the tt(zprof) module makes shell functions be
profiled. The profiling results can be obtained with the tt(zprof)
builtin command made available by this module. There is no way to turn
profiling off other than unloading this module.
startitem()
findex(zprof)
item(tt(zprof) [ tt(-c) ])(
Without the tt(-c) option, tt(zprof) lists profiling results to
standard output. The format is comparable to that of commands like
tt(gprof).
At the top there is a summary listing all functions that were called
at least once. This summary is sorted in decreasing order by the
amount of time spent in the functions themselves. Each line is
preceded by the number of the function in this order (which is used in
other parts of the list in suffixes of the form
`tt([)var(num)tt(])'). The second column gives the number of calls
made to this function. The next three columns list the time in
milliseconds spent in the function and its descendents, the average
time in milliseconds spent in the function and its descendents per
call and the percentage of time spent in all shell functions used in
this function and its descendents. The following three columns give
the same information, but counting only the time spent in the function
itself. The last column finally shows the name of the function.
After the summary, detailed information about every function that was
invoked is listed, sorted in decreasing order by the amount of time
spent in the functions and their descendents. Each of these entries
consists of descriptions for the functions that called the function
described, the function itself, and the functions that were called
from it. The description for the function itself has the same format
as in the summary (and shows the same information). The other lines
don't show the number of the function at the beginning and have their
function named indented to make it easier to visually distinguish the
line showing the function described in the section from the
surrounding lines.
The information shown for the calling and the called functions is
almost the same as in the summary, but is always only for the call arc
described. For example, for a calling function the column showing the
total running time lists the time spent in the described function and
its descendents when it was called from the calling
function. Likewise, for a called function, this columns lists the
total time spent in the called function and its descendents when it
was called from the function described.
For the calling and the called functions, the column showing the
number of calls to a function also show the total number of
invocations made to the called function after a slash.
As long as the tt(zprof) module is loaded, profiling will be done and
multiple invocations of the tt(zprof) builtin command will show the
times and numbers of calls since the module was loaded. With the
tt(-c) option, the tt(zprof) builtin command will reset its internal
counters and will not show the listing.
)
enditem()
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