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Add connection establishment duration logging

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Add log_connections option 'setup_durations' which logs durations of
several key parts of connection establishment and backend setup.

For an incoming connection, starting from when the postmaster gets a
socket from accept() and ending when the forked child backend is first
ready for query, there are multiple steps that could each take longer
than expected due to external factors. This logging provides visibility
into authentication and fork duration as well as the end-to-end
connection establishment and backend initialization time.

To make this portable, the timings captured in the postmaster (socket
creation time, fork initiation time) are passed through the
BackendStartupData.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com>
Reviewed-by: Jelte Fennema-Nio <postgres@jeltef.nl>
Reviewed-by: Guillaume Lelarge <guillaume.lelarge@dalibo.com>
Discussion: https://postgr.es/m/flat/CAAKRu_b_smAHK0ZjrnL5GRxnAVWujEXQWpLXYzGbmpcZd3nLYw%40mail.gmail.com
This commit is contained in:
Melanie Plageman
2025-03-12 11:33:08 -04:00
parent 9219093cab
commit 18cd15e706
12 changed files with 189 additions and 6 deletions
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13
doc/src/sgml/config.sgml
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@ -7369,6 +7369,19 @@ local0.* /var/log/postgresql
</entry>
</row>
<row>
<entry><literal>setup_durations</literal></entry>
<entry>
Logs the time spent establishing the connection and setting up the
backend at the time the connection is ready to execute its first
query. The log message includes the total setup duration, starting
from the postmaster accepting the incoming connection and ending
when the connection is ready for query. It also includes the time
it took to fork the new backend and the time it took to
authenticate the user.
</entry>
</row>
<row>
<entry><literal>all</literal></entry>
<entry>