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bae0e81310
------------------------------------------------------------- revno: 2877 committer: Davi Arnaut <Davi.Arnaut@Sun.COM> branch nick: 35164-6.0 timestamp: Wed 2008-10-15 19:53:18 -0300 message: Bug#35164: Large number of invalid pthread_attr_setschedparam calls Bug#37536: Thread scheduling causes performance degradation at low thread count Bug#12702: Long queries take 100% of CPU and freeze other applications under Windows The problem is that although having threads with different priorities yields marginal improvements [1] in some platforms [2], relying on some statically defined priorities (QUERY_PRIOR and WAIT_PRIOR) to play well (or to work at all) with different scheduling practices and disciplines is, at best, a shot in the dark as the meaning of priority values may change depending on the scheduling policy set for the process. Another problem is that increasing priorities can hurt other concurrent (running on the same hardware) applications (such as AMP) by causing starvation problems as MySQL threads will successively preempt lower priority processes. This can be evidenced by Bug#12702. The solution is to not change the threads priorities and rely on the system scheduler to perform its job. This also enables a system admin to increase or decrease the scheduling priority of the MySQL process, if intended. Furthermore, the internal wrappers and code for changing the priority of threads is being removed as they are now unused and ancient. 1. Due to unintentional side effects. On Solaris this could artificially help benchmarks as calling the priority changing syscall millions of times is more beneficial than the actual setting of the priority. 2. Where it actually works. It has never worked on Linux as the default scheduling policy SCHED_OTHER only accepts the static priority 0. configure.in: Remove checks for functions that are not used anymore. include/config-netware.h: Remove unused define. include/my_pthread.h: Remove thread priority changing wrappers. mysys/my_pthread.c: Remove thread priority changing wrappers. They do not work properly and their implementations were incorrectly protected by a check for HAVE_PTHREAD_SETSCHEDPARAM. mysys/thr_alarm.c: Remove meaningless (100) increase of a thread priority. sql/mysql_priv.h: Remove meaningless thread priority values. sql/mysqld.cc: Don't change thread priorities. sql/slave.cc: Don't change thread priorities. sql/slave.h: Update function prototype. sql/sql_parse.cc: Don't change thread priorities. sql/sql_prepare.cc: Don't change thread priorities. sql/unireg.h: Mark flag as obsolete. storage/innobase/handler/ha_innodb.cc: Remove use of obsolete flag and associated behavior. storage/innobase/include/srv0srv.h: Remove use of obsolete flag and associated variables. storage/innobase/os/os0thread.c: Remove use of obsolete flag and associated behavior. storage/innobase/srv/srv0srv.c: Remove use of obsolete flag and associated variables.
225 lines
8.9 KiB
C
225 lines
8.9 KiB
C
#ifndef UNIREG_INCLUDED
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#define UNIREG_INCLUDED
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/* Copyright (C) 2000-2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Extra functions used by unireg library */
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#ifndef NO_ALARM_LOOP
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#define NO_ALARM_LOOP /* lib5 and popen can't use alarm */
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#endif
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/* These paths are converted to other systems (WIN95) before use */
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#define LANGUAGE "english/"
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#define ERRMSG_FILE "errmsg.sys"
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#define TEMP_PREFIX "MY"
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#define LOG_PREFIX "ML"
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#define PROGDIR "bin/"
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#ifndef MYSQL_DATADIR
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#define MYSQL_DATADIR "data/"
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#endif
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#ifndef SHAREDIR
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#define SHAREDIR "share/"
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#endif
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#ifndef PLUGINDIR
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#define PLUGINDIR "lib/plugin"
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#endif
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#define CURRENT_THD_ERRMSGS current_thd->variables.lc_messages->errmsgs->errmsgs
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#define DEFAULT_ERRMSGS my_default_lc_messages->errmsgs->errmsgs
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#define ER(X) CURRENT_THD_ERRMSGS[(X) - ER_ERROR_FIRST]
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#define ER_DEFAULT(X) DEFAULT_ERRMSGS[(X) - ER_ERROR_FIRST]
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#define ER_SAFE(X) (((X) >= ER_ERROR_FIRST && (X) <= ER_ERROR_LAST) ? ER(X) : "Invalid error code")
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#define ERRMAPP 1 /* Errormap f|r my_error */
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#define LIBLEN FN_REFLEN-FN_LEN /* Max l{ngd p} dev */
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/* extra 4+4 bytes for slave tmp tables */
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#define MAX_DBKEY_LENGTH (NAME_LEN*2+1+1+4+4)
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#define MAX_ALIAS_NAME 256
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#define MAX_FIELD_NAME 34 /* Max colum name length +2 */
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#define MAX_SYS_VAR_LENGTH 32
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#define MAX_KEY MAX_INDEXES /* Max used keys */
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#define MAX_REF_PARTS 16 /* Max parts used as ref */
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#define MAX_KEY_LENGTH 3072 /* max possible key */
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#if SIZEOF_OFF_T > 4
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#define MAX_REFLENGTH 8 /* Max length for record ref */
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#else
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#define MAX_REFLENGTH 4 /* Max length for record ref */
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#endif
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#define MAX_HOSTNAME 61 /* len+1 in mysql.user */
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#define MAX_MBWIDTH 3 /* Max multibyte sequence */
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#define MAX_FIELD_CHARLENGTH 255
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#define MAX_FIELD_VARCHARLENGTH 65535
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#define MAX_FIELD_BLOBLENGTH UINT_MAX32 /* cf field_blob::get_length() */
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#define CONVERT_IF_BIGGER_TO_BLOB 512 /* Used for CREATE ... SELECT */
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/* Max column width +1 */
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#define MAX_FIELD_WIDTH (MAX_FIELD_CHARLENGTH*MAX_MBWIDTH+1)
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#define MAX_BIT_FIELD_LENGTH 64 /* Max length in bits for bit fields */
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#define MAX_DATE_WIDTH 10 /* YYYY-MM-DD */
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#define MAX_TIME_WIDTH 23 /* -DDDDDD HH:MM:SS.###### */
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#define MAX_DATETIME_FULL_WIDTH 29 /* YYYY-MM-DD HH:MM:SS.###### AM */
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#define MAX_DATETIME_WIDTH 19 /* YYYY-MM-DD HH:MM:SS */
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#define MAX_DATETIME_COMPRESSED_WIDTH 14 /* YYYYMMDDHHMMSS */
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#define MAX_TABLES (sizeof(table_map)*8-3) /* Max tables in join */
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#define PARAM_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-3))
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#define OUTER_REF_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-2))
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#define RAND_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-1))
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#define PSEUDO_TABLE_BITS (PARAM_TABLE_BIT | OUTER_REF_TABLE_BIT | \
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RAND_TABLE_BIT)
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#define MAX_FIELDS 4096 /* Limit in the .frm file */
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#define MAX_PARTITIONS 1024
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#define MAX_SELECT_NESTING (sizeof(nesting_map)*8-1)
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#define MAX_SORT_MEMORY (2048*1024-MALLOC_OVERHEAD)
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#define MIN_SORT_MEMORY (32*1024-MALLOC_OVERHEAD)
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/* Memory allocated when parsing a statement / saving a statement */
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#define MEM_ROOT_BLOCK_SIZE 8192
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#define MEM_ROOT_PREALLOC 8192
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#define TRANS_MEM_ROOT_BLOCK_SIZE 4096
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#define TRANS_MEM_ROOT_PREALLOC 4096
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#define DEFAULT_ERROR_COUNT 64
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#define EXTRA_RECORDS 10 /* Extra records in sort */
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#define SCROLL_EXTRA 5 /* Extra scroll-rows. */
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#define FIELD_NAME_USED ((uint) 32768) /* Bit set if fieldname used */
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#define FORM_NAME_USED ((uint) 16384) /* Bit set if formname used */
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#define FIELD_NR_MASK 16383 /* To get fieldnumber */
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#define FERR -1 /* Error from my_functions */
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#define CREATE_MODE 0 /* Default mode on new files */
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#define NAMES_SEP_CHAR '\377' /* Char to sep. names */
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#define READ_RECORD_BUFFER (uint) (IO_SIZE*8) /* Pointer_buffer_size */
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#define DISK_BUFFER_SIZE (uint) (IO_SIZE*16) /* Size of diskbuffer */
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#define ME_INFO (ME_HOLDTANG+ME_OLDWIN+ME_NOREFRESH)
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#define ME_ERROR (ME_BELL+ME_OLDWIN+ME_NOREFRESH)
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#define MYF_RW MYF(MY_WME+MY_NABP) /* Vid my_read & my_write */
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#define SPECIAL_USE_LOCKS 1 /* Lock used databases */
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#define SPECIAL_NO_NEW_FUNC 2 /* Skip new functions */
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#define SPECIAL_SKIP_SHOW_DB 4 /* Don't allow 'show db' */
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#define SPECIAL_WAIT_IF_LOCKED 8 /* Wait if locked database */
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#define SPECIAL_SAME_DB_NAME 16 /* form name = file name */
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#define SPECIAL_ENGLISH 32 /* English error messages */
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#define SPECIAL_NO_RESOLVE 64 /* Don't use gethostname */
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#define SPECIAL_NO_PRIOR 128 /* Obsolete */
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#define SPECIAL_BIG_SELECTS 256 /* Don't use heap tables */
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#define SPECIAL_NO_HOST_CACHE 512 /* Don't cache hosts */
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#define SPECIAL_SHORT_LOG_FORMAT 1024
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#define SPECIAL_SAFE_MODE 2048
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#define SPECIAL_LOG_QUERIES_NOT_USING_INDEXES 4096 /* Obsolete */
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/* Extern defines */
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#define store_record(A,B) bmove_align((A)->B,(A)->record[0],(size_t) (A)->s->reclength)
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#define restore_record(A,B) bmove_align((A)->record[0],(A)->B,(size_t) (A)->s->reclength)
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#define cmp_record(A,B) memcmp((A)->record[0],(A)->B,(size_t) (A)->s->reclength)
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#define empty_record(A) { \
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restore_record((A),s->default_values); \
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bfill((A)->null_flags,(A)->s->null_bytes,255);\
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}
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/* Defines for use with openfrm, openprt and openfrd */
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#define READ_ALL 1 /* openfrm: Read all parameters */
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#define CHANGE_FRM 2 /* openfrm: open .frm as O_RDWR */
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#define READ_KEYINFO 4 /* L{s nyckeldata fr}n filen */
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#define EXTRA_RECORD 8 /* Reservera plats f|r extra record */
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#define DONT_OPEN_TABLES 8 /* Don't open database-files (frd) */
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#define DONT_OPEN_MASTER_REG 16 /* Don't open first reg-file (prt) */
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#define EXTRA_LONG_RECORD 16 /* Plats f|r dubbel s|k-record */
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#define COMPUTE_TYPES 32 /* Kontrollera type f|r f{ltena */
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#define SEARCH_PRG 64 /* S|k efter registret i 'prg_dev' */
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#define READ_USED_NAMES 128 /* L{s anv{nda formul{rnamn */
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#define DONT_GIVE_ERROR 256 /* Don't do frm_error on openfrm */
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#define READ_SCREENS 1024 /* Read screens, info and helpfile */
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#define DELAYED_OPEN 4096 /* Open table later */
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#define OPEN_VIEW 8192 /* Allow open on view */
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#define OPEN_VIEW_NO_PARSE 16384 /* Open frm only if it's a view,
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but do not parse view itself */
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to open FRM file only to get necessary data.
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*/
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#define OPEN_FRM_FILE_ONLY 32768
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to process tables only to get necessary data.
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Views are not processed.
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*/
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#define OPEN_TABLE_ONLY OPEN_FRM_FILE_ONLY*2
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to process views only to get necessary data.
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Tables are not processed.
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*/
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#define OPEN_VIEW_ONLY OPEN_TABLE_ONLY*2
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine.
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The flag means that we need to open a view using
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open_normal_and_derived_tables() function.
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*/
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#define OPEN_VIEW_FULL OPEN_VIEW_ONLY*2
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine.
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The flag means that I_S table uses optimization algorithm.
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*/
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#define OPTIMIZE_I_S_TABLE OPEN_VIEW_FULL*2
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#define SC_INFO_LENGTH 4 /* Form format constant */
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#define TE_INFO_LENGTH 3
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#define MTYP_NOEMPTY_BIT 128
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#define FRM_VER_TRUE_VARCHAR (FRM_VER+4) /* 10 */
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/*
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Minimum length pattern before Turbo Boyer-Moore is used
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for SELECT "text" LIKE "%pattern%", excluding the two
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wildcards in class Item_func_like.
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*/
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#define MIN_TURBOBM_PATTERN_LEN 3
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/*
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Defines for binary logging.
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Do not decrease the value of BIN_LOG_HEADER_SIZE.
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Do not even increase it before checking code.
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*/
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#define BIN_LOG_HEADER_SIZE 4
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#define FLOATING_POINT_BUFFER 331
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#define DEFAULT_KEY_CACHE_NAME "default"
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/* Include prototypes for unireg */
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#include "mysqld_error.h"
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#include "structs.h" /* All structs we need */
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#endif
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