07-30-2009
I've spent most of my time with them fighting to fix it when it breaks itself rather than enjoying their advantages, so I may not truly appreciate what they do for a developer yet. How so?
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PROF(1) General Commands Manual PROF(1)
NAME
prof, kprof - display profiling data
SYNOPSIS
prof [ -dr ] [ program ] [ profile ]
kprof kernel kpdata
DESCRIPTION
Prof interprets files produced automatically by programs loaded using the -p option of 2l(1) or other loader. The symbol table in the
named program file by default) is read and correlated with the profile file by default). For each symbol, the percentage of time (in sec-
onds) spent executing between that symbol and the next is printed (in decreasing order), together with the time spent there and the number
of times that routine was called.
Under option -d, prof prints the dynamic call graph of the target program, annotating the calls with the time spent in each routine and
those it calls, recursively. The output is indented two spaces for each call, and is formatted as
symbol:time/ncall
where symbol is the entry point of the call, time is in milliseconds, and ncall is the number of times that entry point was called at that
point in the call graph. If ncall is one, the /ncall is elided. Normally recursive calls are compressed to keep the output brief; option
-r prints the full call graph.
The size of the buffer in program used to hold the profiling data, by default 2000 entries, may be controlled by setting the environment
variable profsize before running program. If the buffer fills, subsequent function calls may not be recorded.
Kprof is similar to prof, but presents the data accumulated by the kernel profiling device, kprof(3). The symbol table file, that of the
operating system kernel, and the data file, typically /dev/kpdata, must be provided. Kprof has no options and cannot present dynamic data.
SOURCE
/sys/src/cmd/prof.c
/sys/src/cmd/kprof.c
SEE ALSO
2l(1), kprof(3)
PROF(1)