1boot-analysis(1)            Virtualization Support            boot-analysis(1)
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NAME

6       boot-analysis - Trace and analyze the appliance boot process
7

SYNOPSIS

9        ./run utils/boot-analysis/boot-analysis
10

DESCRIPTION

12       Trace and analyze the appliance boot process to find out which steps
13       are taking the most time.  It is not part of the standard tests.
14
15       This needs to be run on a quiet machine, so that other processes
16       disturb the timing as little as possible.  The program is completely
17       safe to run at any time.  It doesn't read or write any external files,
18       and it doesn't require root.
19
20       You can run it from the build directory on the built copy of libguestfs
21       like this:
22
23        make
24        ./run utils/boot-analysis/boot-analysis
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26       If you omit "./run" then it is run on the installed copy of libguestfs.
27
28   How it works
29       We create a libguestfs handle and register callback handlers so we can
30       see appliance messages, trace events and so on.
31
32       We then launch the handle and shut it down as quickly as possible.
33
34       While the handle is running, events (seen by the callback handlers) are
35       written verbatim into an in-memory buffer, with timestamps.
36
37       Afterwards we analyze the result using regular expressions to try to
38       identify a "timeline" for the handle (eg. at what time did the BIOS
39       hand control to the kernel).  This analysis is done in
40       utils/boot-analysis/boot-analysis-timeline.c.
41
42       The whole process is repeated across a few runs, and the final timeline
43       (including statistical analysis of the variation between runs) gets
44       printed.
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46       The program is very sensitive to the specific messages printed by
47       BIOS/kernel/supermin/userspace.  It only works on x86-64 or aarch64.
48       It will require periodic adjustment of the regular expressions in order
49       to keep things up to date.
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OPTIONS

52       --help
53           Display brief help.
54
55       --append "OPTIONS"
56           Append "OPTIONS" to the kernel command line.
57
58       --color
59       --colour
60           Output colours (as ANSI escape sequences), even if the output is
61           not a terminal.
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63       -m MB
64       --memsize MB
65           Set the appliance memory size in MB.
66
67       --smp N
68           Enable "N" virtual CPUs.
69
70       -v
71       --verbose
72           More verbose output, useful for debugging problems.
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SEE ALSO

75       guestfs-performance(1), http://libguestfs.org/.
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AUTHOR

78       Richard W.M. Jones http://people.redhat.com/~rjones/
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81       Copyright (C) 2016 Red Hat Inc.
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LICENSE

84       This program is free software; you can redistribute it and/or modify it
85       under the terms of the GNU General Public License as published by the
86       Free Software Foundation; either version 2 of the License, or (at your
87       option) any later version.
88
89       This program is distributed in the hope that it will be useful, but
90       WITHOUT ANY WARRANTY; without even the implied warranty of
91       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
92       General Public License for more details.
93
94       You should have received a copy of the GNU General Public License along
95       with this program; if not, write to the Free Software Foundation, Inc.,
96       51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
97

BUGS

99       To get a list of bugs against libguestfs, use this link:
100       https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
101
102       To report a new bug against libguestfs, use this link:
103       https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
104
105       When reporting a bug, please supply:
106
107       ·   The version of libguestfs.
108
109       ·   Where you got libguestfs (eg. which Linux distro, compiled from
110           source, etc)
111
112       ·   Describe the bug accurately and give a way to reproduce it.
113
114       ·   Run libguestfs-test-tool(1) and paste the complete, unedited output
115           into the bug report.
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119libguestfs-1.40.1                 2019-01-17                  boot-analysis(1)
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