Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   9087 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

TPROF(8)		  BSD System Manager's Manual		      TPROF(8)

NAME
     tprof — record tprof profiling samples

SYNOPSIS
     tprof [-c] [-o file] command ...

DESCRIPTION
     The tprof is a sampling based profiler.

     tprof utility makes the kernel driver start profiling, executes the spec‐
     ified 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‐
     hand.

     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.

EXAMPLES
     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

DIAGNOSTICS
     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‐
		      land consumption.

     overflow	      The number of samples dropped because the per-CPU buffer
		      was full.

     buf	      The number of buffers successfully prepared for userland
		      consumption.

     emptybuf	      The number of buffers which have been dropped because
		      they were empty.

     dropbuf	      The number of buffers dropped because the number of buf‐
		      fers kept in the kernel exceeds the limit.

     dropbuf_samples  The number of samples dropped because the buffers con‐
		      taining the samples were dropped.

SEE ALSO
     tpfmt(1), tprof(4)

AUTHORS
     The tprof utility is written by YAMAMOTO Takashi.

CAVEATS
     The contents and representation of recorded samples are undocumented and
     will likely be changed for future releases of NetBSD in an incompatible
     way.

BSD			       November 26, 2011			   BSD

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome