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btrace(8) [plan9 man page]

BTRACE(8)						      System Manager's Manual							 BTRACE(8)

btrace - trace bitblt protocol SYNOPSIS
btrace [ -d [ d ]] [ -o ofile ] [ -b bfile ] DESCRIPTION
Btrace eavesdrops on messages to and from /dev/bitblt, interprets them as messages in the bit device protocol (see bit(3)), and prints a readable version of the messages on a trace file, btrace.out by default. After btrace is started, it runs in the background, tracing all subsequent graphics programs run in that window. Options for btrace are: -o ofile Print trace output in ofile instead of btrace.out. -b bfile Dump each bitmap read or written to bfile, using the format of bitmap(6). Each succeeding bitmap overwrites the previous con- tents of file. Tweak(1) or showimage(7) can be used to examine the file. -d Increase the level of trace detail. The maximum level is -dd. FILES
/dev/bitblt SOURCE
/sys/src/cmd/btrace.c SEE ALSO
bit(3), bitmap(6), graphics(2), tweak(1), showimage(7) BTRACE(8)

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BTRACE(8)																 BTRACE(8)

btrace - perform live tracing for block devices SYNOPSIS
btrace [-s] [-t] [-w N] [-n N] [-b N] [-r <dbg mnt>] [-a <trace>...] <dev>... DESCRIPTION
The btrace script provides a quick and easy way to do live tracing of block devices. It calls blktrace on the specified devices and pipes the output through blkparse for formatting. See blktrace (8) for more in-depth information about how blktrace works. OPTIONS
-s Displays data sorted by program (see blkparse (1)). -t Displays time deltas per IO (see blkparse (1)). -w N Sets run time to the number of seconds specified (see blktrace (8)). -n N Specifies the number of buffers to use (see blktrace (8)). -b N Specifies buffer size for event extraction (scaled by 1024) (see blktrace (8)). -r <dbg mnt> Specifies the debugfs mountpoint. -a <trace>... Adds mask to current filter (see blktrace (8)). <dev> Specifies the device to trace. EXAMPLE
Simply running % btrace /dev/sda will show a trace of the device /dev/sda. AUTHORS
blkparse was written by Jens Axboe, Alan D. Brunelle and Nathan Scott. This man page was created from the blktrace documentation by Bas Zoetekouw. REPORTING BUGS
Report bugs to <> COPYRIGHT
Copyright (C) 2006 Jens Axboe, Alan D. Brunelle and Nathan Scott. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>. There is NO WARRANTY, to the extent permitted by law. This manual page was created for Debian by Bas Zoetekouw. It was derived from the documentation provided by the authors and it may be used, distributed and modified under the terms of the GNU General Public License, version 2. On Debian systems, the text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2. SEE ALSO
blktrace (8), blkparse (1), verify_blkparse (1), blkrawverify (1), btt (1) blktrace git-20070306202522 March 6, 2007 BTRACE(8)
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