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base repository: postgresql-cfbot/postgresql
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compare: cf/5919
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  • 2 commits
  • 4 files changed
  • 2 contributors

Commits on Aug 31, 2025

  1. Eagerly flush bulkwrite strategy ring 

    Operations using BAS_BULKWRITE (COPY FROM and createdb) will inevitably
need to flush buffers in the strategy ring in order to reuse
them. By eagerly flushing the buffers in a larger batch, we encourage
larger writes at the kernel level and less interleaving of WAL flushes
and data file writes. The effect is mainly noticeable with multiple
parallel COPY FROMs. In this case, client backends achieve higher write
throughput and end up spending less time waiting on acquiring the lock
to flush WAL. Larger flush operations also mean less time waiting for
flush operations at the kernel level as well.

The heuristic for eager eviction is to only flush buffers in the
strategy ring which flushing does not require flushing WAL.

This patch also is a stepping stone toward using AIO for COPY FROM.

Reviewed-by: Kirill Reshke <[email protected]>
Discussion: https://postgr.es/m/flat/CAAKRu_Yjn4mvN9NBxtmsCQSGwup45CoA4e05nhR7ADP-v0WCig%40mail.gmail.com
    @melanieplageman
    melanieplageman authored and Commitfest Bot committed Aug 31, 2025
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  2. [CF 5919] v2 - Eagerly evict bulkwrite strategy ring 

    This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5919

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/CAAKRu_bwy5=Rz-rizSc-LhHP08nkwSQ_Eix2b256RDmgRj4wSw@mail.gmail.com
Author(s): Melanie Plageman
    Commitfest Bot committed Aug 31, 2025
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    64a137c View commit details
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