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With AIO it does not make sense anymore to track the time for each individual IO, as multiple IOs can be in-flight at the same time. Instead we now track the time spent *waiting* for IOs. This should be reflected in the docs. While, so far, we only do a subset of reads, and no other operations, via AIO, describing the GUC and view columns as measuring IO waits is accurate for synchronous and asynchronous IO. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/5dzyoduxlvfg55oqtjyjehez5uoq6hnwgzor4kkybkfdgkj7ag@rbi4gsmzaczk |
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