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| -rw-r--r-- | examples/guestfs-performance.pod | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/examples/guestfs-performance.pod b/examples/guestfs-performance.pod index cdf9cd81..ca4ce855 100644 --- a/examples/guestfs-performance.pod +++ b/examples/guestfs-performance.pod @@ -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 |