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Improve speed of timestamp/time/date output functions.

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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
This commit is contained in:
Tom Lane
2016-02-06 23:11:28 -05:00
parent b921aeb167
commit aa2387e2fd
3 changed files with 424 additions and 128 deletions
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src/include/utils/builtins.h
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@@ -290,6 +290,8 @@ extern int32 pg_atoi(const char *s, int size, int c);
extern void pg_itoa(int16 i, char *a);
extern void pg_ltoa(int32 l, char *a);
extern void pg_lltoa(int64 ll, char *a);
extern char *pg_ltostr_zeropad(char *str, int32 value, int32 minwidth);
extern char *pg_ltostr(char *str, int32 value);
/*
* Per-opclass comparison functions for new btrees. These are