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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-02-06 23:11:28 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-02-06 23:11:28 -0500 |
| commit | aa2387e2fd532954e88dfd8546ab894b9305123d (patch) | |
| tree | c58b1331597a50ad2cfc96b4fac5a81fde34f050 /src/backend/access/transam/parallel.c | |
| parent | b921aeb1676f128f2c41ddc40d3887964ea9eae9 (diff) | |
| download | postgresql-aa2387e2fd532954e88dfd8546ab894b9305123d.tar.gz postgresql-aa2387e2fd532954e88dfd8546ab894b9305123d.zip | |
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
Diffstat (limited to 'src/backend/access/transam/parallel.c')
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