On Wed, Apr 18, 2018 at 11:40:51AM +0200, Fabien COELHO wrote: >> - double-write buffers use a pre-decided numbers of pages (32 for the >> checkpointer, 128 divided into 4 buckets for the backends), which are >> synced into disk once each batch is full. > >> - The double-write file of the checkpointer uses ordering of pages using >> blocks number and files to minimize the number of syncs to happen, using >> a custom sequential I/O algorithm. > > I'm not sure from reading the descriptions. > > Are these particular features related/similar to 9cd00c4 "Checkpoint sorting > and balancing" and 428b1d6 "Allow to trigger kernel writeback after a > configurable number of writes", committed in February 2016?
Not real direct links that I know of, but the work which has been done could be benefitial for checkpoints which need to handle doublle-write streams. -- Michael
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