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docs: Show how to use 'annotate-output' command to collect timings.

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Richard W.M. Jones
2012-08-12 22:51:45 +01:00
parent 769a6f24c6
commit 22da2cb0ae
1 changed files with 17 additions and 0 deletions
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examples/guestfs-performance.pod
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@@ -295,6 +295,23 @@ Avoid processors that don't have hardware virtualization, and some
processors which are simply very slow (AMD Geode being a great
example).
=head1 DETAILED TIMINGS USING ANNOTATE
Use the L<annotate(1)>/L<annotate-output(1)> command to show detailed
timings:
$ annotate-output +'%T.%N' guestfish -a /dev/null run -v
22:17:53.215784625 I: Started guestfish -a /dev/null run -v
22:17:53.240335409 E: libguestfs: [00000ms] febootstrap-supermin-helper --verbose -f checksum '/usr/lib64/guestfs/supermin.d' x86_64
22:17:53.266857866 E: supermin helper [00000ms] whitelist = (not specified), host_cpu = x86_64, kernel = (null), initrd = (null), appliance = (null)
22:17:53.272704072 E: supermin helper [00000ms] inputs[0] = /usr/lib64/guestfs/supermin.d
22:17:53.276528651 E: checking modpath /lib/modules/3.4.0-1.fc17.x86_64.debug is a directory
[etc]
The timestamps are C<hours:minutes:seconds.nanoseconds>. By comparing
the timestamps you can see exactly how long each operation in the boot
sequence takes.
=head1 DETAILED TIMINGS USING SYSTEMTAP
You can use SystemTap (L<stap(1)>) to get detailed timings from