pg.ddx.io pgsql-hackers@postgresql.org mailing list archive help / color / mirror / Atom feed From: David Fetter <david@fetter.org>
To: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Finer grain log timestamps
Date: Sun, 8 May 2022 20:44:51 +0000
Message-ID: <20220508204451.GC11333@fetter.org> (raw )
Folks,
Please find attached a patch to change the sub-second granularity of
log timestamps from milliseconds to microseconds.
I started out working on a longer patch that will give people
more choices than whole seconds and microseconds, but there were a lot
of odd corner cases, including what I believe might have been a
requirement for C11, should be wish to get sub-microsecond
granularity.
Best,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778
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Attachments:
v1-0001-Change-log-timestamps-from-milli-to-microseconds.patch (text/x-diff, 3.7K) download
From f4881d1669526597bdf608c7c59858f88314f8d1 Mon Sep 17 00:00:00 2001
From: David Fetter <david@fetter.org>
Date: Sun, 8 May 2022 13:24:33 -0700
Subject: [PATCH v1] Change log timestamps from milli- to microseconds
---
doc/src/sgml/config.sgml | 12 ++++++------
src/backend/utils/error/elog.c | 14 +++++++-------
2 files changed, 13 insertions(+), 13 deletions(-)
diff --git doc/src/sgml/config.sgml doc/src/sgml/config.sgml
index 03986946a8..f00db09547 100644
--- doc/src/sgml/config.sgml
+++ doc/src/sgml/config.sgml
@@ -7174,17 +7174,17 @@ local0.* /var/log/postgresql
</row>
<row>
<entry><literal>%t</literal></entry>
- <entry>Time stamp without milliseconds</entry>
+ <entry>Time stamp at second resolution</entry>
<entry>no</entry>
</row>
<row>
<entry><literal>%m</literal></entry>
- <entry>Time stamp with milliseconds</entry>
+ <entry>Time stamp with microseconds</entry>
<entry>no</entry>
</row>
<row>
<entry><literal>%n</literal></entry>
- <entry>Time stamp with milliseconds (as a Unix epoch)</entry>
+ <entry>Time stamp with microseconds (as a Unix epoch)</entry>
<entry>no</entry>
</row>
<row>
@@ -7526,7 +7526,7 @@ log_line_prefix = '%m [%p] %q%u@%d/%a '
This option emits log lines in comma-separated-values
(<acronym>CSV</acronym>) format,
with these columns:
- time stamp with milliseconds,
+ time stamp with microseconds,
user name,
database name,
process ID,
@@ -7557,7 +7557,7 @@ log_line_prefix = '%m [%p] %q%u@%d/%a '
<programlisting>
CREATE TABLE postgres_log
(
- log_time timestamp(3) with time zone,
+ log_time timestamp(6) with time zone,
user_name text,
database_name text,
process_id integer,
@@ -7682,7 +7682,7 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<row>
<entry><literal>timestamp</literal></entry>
<entry>string</entry>
- <entry>Time stamp with milliseconds</entry>
+ <entry>Time stamp with microseconds</entry>
</row>
<row>
<entry><literal>user</literal></entry>
diff --git src/backend/utils/error/elog.c src/backend/utils/error/elog.c
index 55ee5423af..4698e32ab7 100644
--- src/backend/utils/error/elog.c
+++ src/backend/utils/error/elog.c
@@ -2295,7 +2295,7 @@ char *
get_formatted_log_time(void)
{
pg_time_t stamp_time;
- char msbuf[13];
+ char msbuf[16];
/* leave if already computed */
if (formatted_log_time[0] != '\0')
@@ -2315,13 +2315,13 @@ get_formatted_log_time(void)
* nonempty or CSV mode can be selected.
*/
pg_strftime(formatted_log_time, FORMATTED_TS_LEN,
- /* leave room for milliseconds... */
- "%Y-%m-%d %H:%M:%S %Z",
+ /* leave room for microseconds... */
+ "%Y-%m-%d %H:%M:%S %Z",
pg_localtime(&stamp_time, log_timezone));
/* 'paste' milliseconds into place... */
- sprintf(msbuf, ".%03d", (int) (saved_timeval.tv_usec / 1000));
- memcpy(formatted_log_time + 19, msbuf, 4);
+ sprintf(msbuf, ".%06d", saved_timeval.tv_usec );
+ memcpy(formatted_log_time + 19, msbuf, 7);
return formatted_log_time;
}
@@ -2652,9 +2652,9 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
saved_timeval_set = true;
}
- snprintf(strfbuf, sizeof(strfbuf), "%ld.%03d",
+ snprintf(strfbuf, sizeof(strfbuf), "%ld.%06d",
(long) saved_timeval.tv_sec,
- (int) (saved_timeval.tv_usec / 1000));
+ saved_timeval.tv_usec);
if (padding != 0)
appendStringInfo(buf, "%*s", padding, strfbuf);
--
2.35.1
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Subject: Re: Finer grain log timestamps
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