[tor-bugs] #12464 [Tor]: When Tor 0.2.6.x is closer to done, profile relays running Tor 0.2.6.x and optimize accordingly

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#12464: When Tor 0.2.6.x is closer to done, profile relays running Tor 0.2.6.x and
optimize accordingly
------------------------+-------------------------------------------------
     Reporter:  nickm   |      Owner:  dgoulet
         Type:  defect  |     Status:  assigned
     Priority:  normal  |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  tor-relay performance 026-triaged-1
Actual Points:          |  Parent ID:
       Points:          |
------------------------+-------------------------------------------------

Comment (by dgoulet):

 Here are some perf results from a busy hidden service. Everything above 2%
 is shown here:
 {{{
 +  34.25%  tor  [.] fmonty
 -   6.43%  tor  [.] smartlist_remove
    - smartlist_remove
       - 99.84% smartlist_subtract
            router_choose_random_node
            choose_good_middle_server
            onion_extend_cpath
            onion_populate_cpath
            circuit_establish_circuit
          - circuit_launch_by_extend_info
             + 78.39% rend_service_introduce
             + 19.19% circuit_launch
             + 2.42% rend_service_relaunch_rendezvous
 -   4.85%  tor  [.] node_get_prim_orport
    - node_get_prim_orport
       - 97.86% node_get_addr
          - nodelist_add_node_and_family
             + 71.40% choose_good_middle_server
             + 28.60% populate_live_entry_guards
       + 2.14% nodelist_add_node_and_family
 +   4.84%  tor  [.] tor_addr_compare_masked
 +   2.95%  tor  [.] siphash24
 +   2.78%  tor  [.] swap_conditional
 +   2.51%  tor  [.] nodelist_add_node_and_family
 +   2.41%  tor  [.] tor_memeq
 +   2.36%  tor  [.] compute_weighted_bandwidths
 +   2.34%  tor  [.] crecip
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12464#comment:11>
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