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3758eab71c
When using the round-robin load balancer, the major source of contention is the lbprm lock, that has to be held every time we pick a server. To mitigate that, make it so there are one tree per thread-group, and one lock per thread-group. That means we now have a lb_fwrr_per_tgrp structure that will contain the two lb_fwrr_groups (active and backup) as well as the lock to protect them in the per-thread lbprm struct, and all fields in the struct server are now moved to the per-thread structure too. Those changes are mostly mechanical, and brings good performances improvment, on a 64-cores AMD CPU, with 64 servers configured, we could process about 620000 requests par second, and we now can process around 1400000 requests per second.