From f02800bd9733efbdc1328f866ad0ef2779939f7c Mon Sep 17 00:00:00 2001 From: Alexander Barkov Date: Wed, 30 Sep 2009 10:09:28 +0500 Subject: Backporting WL#3759 Optimize identifier conversion in client-server protocol This patch provides performance improvements: - send_fields() when character_set_results = latin1 is now about twice faster for column/table/database names, consisting on ASCII characters. Changes: - Protocol doesn't use "convert" temporary buffer anymore, and converts strings directly to "packet". - General conversion optimization: quick conversion of ASCII strings was added. modified files: include/m_ctype.h - Adding a new flag. - Adding a new function prototype libmysqld/lib_sql.cc - Adding quick conversion method for embedded library: conversion is now done directly to result buffer, without using a temporary buffer. mysys/charset.c - Mark all dynamic ucs2 character sets as non-ASCII - Mark some dymamic 7bit and 8bit charsets as non-ASCII (for example swe7 is not fully ASCII compatible). sql/protocol.cc - Adding quick method to convert a string directly into protocol buffer, without using a temporary buffer. sql/protocol.h - Adding a new method prototype sql/sql_string.cc Optimization for conversion between two ASCII-compatible charsets: - quickly convert ASCII strings, switch to mc_wc->wc_mb method only when a non-ASCII character is met. - copy four ASCII characters at once on i386 strings/conf_to_src.c - Marking non-ASCII character sets with a flag. strings/ctype-extra.c - Regenerating ctype-extra.c by running "conf_to_src". strings/ctype-uca.c - Marking UCS2 character set as non-ASCII. strings/ctype-ucs2.c - Marking UCS2 character set as non-ASCII. strings/ctype.c - A new function to detect if a 7bit or 8bit character set is ascii compatible. --- strings/conf_to_src.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'strings/conf_to_src.c') diff --git a/strings/conf_to_src.c b/strings/conf_to_src.c index 7e742050aa8..9f1ed9b2441 100644 --- a/strings/conf_to_src.c +++ b/strings/conf_to_src.c @@ -184,11 +184,12 @@ void dispcset(FILE *f,CHARSET_INFO *cs) { fprintf(f,"{\n"); fprintf(f," %d,%d,%d,\n",cs->number,0,0); - fprintf(f," MY_CS_COMPILED%s%s%s%s,\n", + fprintf(f," MY_CS_COMPILED%s%s%s%s%s,\n", cs->state & MY_CS_BINSORT ? "|MY_CS_BINSORT" : "", cs->state & MY_CS_PRIMARY ? "|MY_CS_PRIMARY" : "", is_case_sensitive(cs) ? "|MY_CS_CSSORT" : "", - my_charset_is_8bit_pure_ascii(cs) ? "|MY_CS_PUREASCII" : ""); + my_charset_is_8bit_pure_ascii(cs) ? "|MY_CS_PUREASCII" : "", + !my_charset_is_ascii_compatible(cs) ? "|MY_CS_NONASCII": ""); if (cs->name) { -- cgit v1.2.1