| Lists: | pgsql-bugs |
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| From: | PG Bug reporting form <noreply(at)postgresql(dot)org> |
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| To: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Cc: | hchuang95(at)gmail(dot)com |
| Subject: | BUG #15682: Change default value of checkpoint_completion_target to 0.9 for better performance? |
| Date: | 2019-03-09 04:06:47 |
| Message-ID: | 15682-6f5b4628a045d939@postgresql.org |
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| Lists: | pgsql-bugs |
The following bug has been logged on the website:
Bug reference: 15682
Logged by: Haoc Huang
Email address: hchuang95(at)gmail(dot)com
PostgreSQL version: 11.0
Operating system: Ubuntu 18.04
Description:
The [official
document](https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server)
recommends to set **checkpoint_completion_target** to **0.9**, which is the
more useful value and improves the performance.
"You can spread those writes out further, lowering the average write
overhead, by increasing the checkpoint_completion_target parameter to its
useful maximum of 0.9 (aim to finish by the time 90% of the next checkpoint
is here) rather than the default of 0.5 (aim to finish when the next one is
50% done). "
I wonder if the default need to be changed for performance concern. Thanks.