I tested this again with many more WAL files and a much larger machine (r5d.24xlarge with data directory on an NVMe SSD instance store volume). As before, I am using a bare-bones archive module that does nothing but return true. Without the patch, archiving ~120k WAL files took about 109 seconds. With the patch, it took around 62 seconds, which amounts to a ~43% reduction in overhead.
-- Nathan Bossart Amazon Web Services: https://aws.amazon.com
