On Sat, Mar 7, 2020 at 11:54 PM Evgeniy Shishkin <itparan...@gmail.com> wrote: > > On Mar 7, 2020, at 00:33, Thomas Munro <thomas.mu...@gmail.com> wrote: > > That is indeed what led me to start thinking about what a good new > > name would be. > > MySQL has a term io_capacity. > https://dev.mysql.com/doc/refman/8.0/en/innodb-configuring-io-capacity.html > > The innodb_io_capacity variable defines the overall I/O capacity available > > to InnoDB. It should be set to approximately the number of I/O operations > > that the system can perform per second (IOPS). When innodb_io_capacity is > > set, InnoDB estimates the I/O bandwidth available for background tasks > > based on the set value. > > > > Perhaps we can have maintenance_io_capacity as well.
That sounds like total I/O capacity for your system that will be shared out for various tasks, which would definitely be nice to have, but here we're talking about a simpler per-operation settings. What we have is a bit like work_mem (a memory limit used for each individual hash, sort, tuplestore, ...), compared to a hypothetical whole-system memory budget (which would definitely also be nice to have).
