On Mon, 21 Jan 2019 at 08:31, Andres Freund <and...@anarazel.de> wrote: > > Hi, > > (resending with compressed attachements, perhaps that'll go through) > > On 2018-12-10 18:13:40 -0800, Andres Freund wrote: > > On 2018-11-26 17:55:57 -0800, Andres Freund wrote: > > > FWIW, now that oids are removed, and the tuple table slot abstraction > > > got in, I'm working on rebasing the pluggable storage patchset ontop of > > > that. > > > > I've pushed a version to that to the git tree, including a rebased > > version of zheap: > > https://github.com/anarazel/postgres-pluggable-storage
I worked on a slight improvement on the 0040-WIP-Move-xid-horizon-computation-for-page-level patch . Instead of pre-fetching all the required buffers beforehand, the attached WIP patch pre-fetches the buffers keeping a constant distance ahead of the buffer reads. It's a WIP patch because right now it just uses a hard-coded 5 buffers ahead. Haven't used effective_io_concurrency like how it is done in nodeBitmapHeapscan.c. Will do that next. But before that, any comments on the way I did the improvements would be nice. Note that for now, the patch is based on the pluggable-storage latest commit; it does not replace the 0040 patch in the patch series. -- Thanks, -Amit Khandekar EnterpriseDB Corporation The Postgres Database Company
prefetch_xid_horizon_scan_WIP.patch
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