BIND 10 #1563: document how to profile - oprofile

[BIND 10 Development]

#1563: document how to profile - oprofile
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                   Reporter:  jelte  |                 Owner:  vorner
                       Type:  task   |                Status:  reviewing
                   Priority:  major  |             Milestone:
                  Component:         |  Sprint-20120124
  Unclassified                       |            Resolution:
                   Keywords:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DNS
Feature Depending on Ticket:         |  Estimated Difficulty:  0
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  UnAssigned => vorner


Comment:

 I have walked through it, and profiled query_bench tool. Looks good :)

 Just a few notes on things I encountered (probably quite system-
 dependent);

 - opcontrol needs to be run as root (with sudo in my case), I'm guessing
 it is setuid on your system?
 - as noted, IBS_OP_ALL is an AMD-specific setting. It does not work on my
 i5, and it is kind of half mentioned, but if one changes the -e values,
 the settings are retained until changed again (even through reboots). I
 was playing around with some random ones from the i7 list, and could not
 get any results at all anymore (no samples error) :) Probably worth
 mentioning that you can revert them with '-e default'
 - at least for the run with query_bench, I had to call opreport and
 opannotate on .libs/lt-query_bench, not .lib/query_bench
 - I'd include a link to http://oprofile.sourceforge.net/docs/
 Not sure if we should just mention the systemspecific points or perhaps
 think of some architecture-dependent notes as a sort of appendix.

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Ticket URL: <http://bind10.isc.org/ticket/1563#comment:6>
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