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 ------- 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(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
