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From: Hayato Kuroda (Fujitsu) <[email protected]>
To: 'Mircea Cadariu' <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Heikki Linnakangas <[email protected]>
Cc: lakshmi <[email protected]>
Subject: RE: parallel data loading for pgbench -i
Date: Mon, 13 Apr 2026 07:23:39 +0000
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Dear Mircea,

Thanks for updating the patch. Now each worker looks like not to create each
child tables, just run TRUNCATE and COPY. But I'm unclear why the TRUNCATE is
needed here. Isn't they truncated in initGenerateDataClientSide()->initTruncateTables()
before launching threads?
Also, the current API is questionable. E.g., we cannot work in series if --partition is
specified. And I'm afraid OOM failure may be more likely to happen if the table has
many partitions.
Is it possible that we can have -p again for the initialization? We can require
partitions >= nthreads or partitions % nthreads == 0 at that time.


Best regards,
Hayato Kuroda
FUJITSU LIMITED

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