Hi Lakshmi,
On 19/01/2026 09:25, lakshmi wrote:
Hi Mircea,
I tested the patch on 19devel and it worked well for me.
Before applying it, -j is rejected in pgbench initialization mode as expected. After applying the patch, pgbench -i -s 100 -j 10 runs successfully and shows a clear speedup.
On my system the total runtime dropped to about 9.6s, with client-side data generation around 3.3s.
I also checked correctness after the run — row counts for pgbench_accounts, pgbench_branches, and pgbench_tellers all match the expected values.
Thanks for working on this, the improvement is very noticeable.
Best regards,
lakshmi
Thanks for having a look and trying it out!
FYI this is one of Tomas Vondra's patch ideas from his blog [1].
I have attached a new version which now includes docs, tests, a proposed commit message, and an attempt to fix the current CI failures (Windows).
[1] - https://vondra.me/posts/patch-idea-parallel-pgbench-i
--
Thanks,
Mircea Cadariu
