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TPROF(8) NetBSD System Manager's Manual TPROF(8)
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tprof -- record tprof profiling samples
tprof op [arguments]
The tprof tool can be used to monitor hardware events (PMCs) during the
execution of certain commands.
The 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 before-
The tprof utility accepts the following options. The first argument, op,
specifies the action to take. Valid actions are:
list Display a list of performance counter events available on
monitor -e name:option [-o outfile] command
Monitor the execution of command command. name specifies
the name of the event to count; it must be taken from the
list of available events. option specifies the source of
the event; it must be a combination of u (userland) and k
(kernel). The collected samples are written into the file
outfile if specified. The default is ``tprof.out''.
analyze [-CkLPs] [-p pid] file
Analyze the samples produced by a previous run of tprof,
stored in file, and generate a plain text representation
-C Don't distinguish CPUs. All samples are
treated as its CPU number is 0.
-k Kernel only. Ignore samples for userland
-L Don't distinguish LWPs. All samples are
treated as its LWP ID is 0.
-P Don't distinguish processes. All samples
are treated as its PID is 0.
-p pid Process only samples for the process with
PID pid and ignore the rest.
-s Per symbol.
The following command profiles the system during 20 seconds and writes
the samples into the file myfile.out.
# tprof monitor -e llc-misses:k -o myfile.out sleep 20
The following command displays the results of the sampling.
# tprof analyze myfile.out
The following CPU models are supported:
- x86 AMD Family 10h
- x86 AMD Family 15h
- x86 AMD Family 17h
- x86 Intel Generic (all Intel CPUs)
- x86 Intel Skylake/Kabylake
- x86 Intel Silvermont/Airmont
- x86 Intel Goldmont
- x86 Intel Goldmont Plus
The tprof utility reports the following statistics about the activities
of the tprof pseudo driver.
sample The number of samples collected and prepared for user-
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 con-
taining the samples were dropped.
The tprof utility was written by YAMAMOTO Takashi. It was revamped by
Maxime Villard in 2018.
The contents and representation of recorded samples are undocumented and
will likely be changed for future releases of NetBSD in an incompatible
NetBSD 9.3 October 11, 2019 NetBSD 9.3