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Fixed Size for the Read Ahead Area

InnoDB dynamically calculates the size of the read-ahead area in case it has to trigger its read-ahead algorithm. When the workload involves heavy I/O operations, this size is computed so frequently that it has a non-negligible impact on the CPU usage. With this fix, buffer read-ahead area size is precalculated once per buffer pool instance initialization, and this value is used each time read-ahead is invoked. This implementation should remove a bottleneck experienced by some users.

Version Specific Information

  • 5.6.13-60.5 : Percona Server 5.5 feature re-implemented

Other Information

This documentation is developed in Launchpad as part of the Percona Server 5.6.
If you spotted inaccuracies, errors, don't understood it or you think something is missing or should be improved, please file a bug.

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