From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Improve speed of timestamp/time/date output functions. |
Date: | 2016-02-07 04:11:40 |
Message-ID: | E1aSGhI-0004cN-Hn@gemulon.postgresql.org |
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Thread: | |
Lists: | pgsql-committers |
Improve speed of timestamp/time/date output functions.
It seems that sprintf(), at least in glibc's version, is unreasonably slow
compared to hand-rolled code for printing integers. Replacing most uses of
sprintf() in the datetime.c output functions with special-purpose code
turns out to give more than a 2X speedup in COPY of a table with a single
timestamp column; which is pretty impressive considering all the other
logic in that code path.
David Rowley and Andres Freund, reviewed by Peter Geoghegan and myself
Branch
------
master
Details
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http://git.postgresql.org/pg/commitdiff/aa2387e2fd532954e88dfd8546ab894b9305123d
Modified Files
--------------
src/backend/utils/adt/datetime.c | 389 ++++++++++++++++++++++++++-------------
src/backend/utils/adt/numutils.c | 161 ++++++++++++++++
src/include/utils/builtins.h | 2 +
3 files changed, 424 insertions(+), 128 deletions(-)
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