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mariadb/mysql-test/suite/sys_vars/r
Sergey Vojtovich ce04790065 MDEV-14482 - Cache line contention on ut_rnd_ulint_counter()
InnoDB RNG maintains global state, causing otherwise unnecessary bus
traffic. Even worse this is cross-mutex traffic. That is different
mutexes suffer from contention.

Fixed delay of 4 was verified to give best throughput by OLTP update
index and read-write benchmarks on Intel Broadwell (2/20/40) and
ARM (1/46/46).
2018-01-26 10:25:33 +04:00
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