On Wed, Oct 25, 2023 at 12:37:45AM +0300, Heikki Linnakangas wrote: > On 25/10/2023 00:18, Nathan Bossart wrote: >> Actually, since the pg_waldump benchmark likely only involves very small >> WAL records, it would make sense that there isn't much difference. >> *facepalm* > > No need to guess, pg_waldump -z will tell you what the record size is. And > you can vary it by changing the checkpoint interval and/or pgbench scale > factor: if you checkpoint frequently or if the database is larger, you get > more full-page images which makes the records larger on average, and vice > versa.
If you are looking at computing the CRC of records with arbitrary sizes, why not just generating a series with pg_logical_emit_message() before doing a comparison with pg_waldump or a custom replay loop to go through the records? At least it would make the results more predictible. -- Michael
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