TPROF(8) System Manager's Manual TPROF(8)
tprof -- record tprof profiling samples
tprof [-c] [-o file] command ...
The tprof is a sampling based profiler.
tprof utility makes the kernel driver start profiling, executes the
specified command, keeps recording samples from the kernel driver until
the command finishes, and reports statistics to the standard error.
The tprof pseudo driver and a suitable backend should be loaded
The tprof utility accepts the following options.
-o file Write the collected samples to the file named file. The
default is ``tprof.out''.
-c Write the collected samples to the standard output. Note that
the output is a binary stream.
The following command profiles the system during 1 second and shows the
top-10 kernel functions which likely consumed CPU cycles.
tprof -c sleep 1 2>/dev/null | tpfmt -skCLP | head -10
The tprof utility reports the following statistics about the activities
of the tprof pseudo driver.
sample The number of samples collected and prepared for
overflow The number of samples dropped because the per-CPU buffer
buf The number of buffers successfully prepared for userland
emptybuf The number of buffers which have been dropped because
they were empty.
dropbuf The number of buffers dropped because the number of
buffers kept in the kernel exceeds the limit.
dropbuf_samples The number of samples dropped because the buffers
containing the samples were dropped.
The tprof utility is written by YAMAMOTO Takashi.
The contents and representation of recorded samples are undocumented and
will likely be changed for future releases of NetBSD in an incompatible
NetBSD 6.1.5 November 26, 2011 NetBSD 6.1.5