Suboptimal code in my_strnxfrm_simple()
Bug #1132350 reported by
Alexey Kopytov
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| MySQL Server |
Unknown
|
Unknown
|
|||
| Percona Server moved to https://jira.percona.com/projects/PS |
Fix Released
|
Medium
|
Laurynas Biveinis | ||
| 5.1 |
Won't Fix
|
Undecided
|
Unassigned | ||
| 5.5 |
Fix Released
|
Medium
|
Alexey Kopytov | ||
| 5.6 |
Fix Released
|
Medium
|
Laurynas Biveinis | ||
Bug Description
This ancient code in my_strnxfrm_
if (dest != src)
{
const uchar *end;
for ( end=src+len; src < end ; )
*dest++= map[*src++];
}
else
{
const uchar *end;
for ( end=dest+len; dest < end ; dest++)
*dest= (char) map[(uchar) *dest];
}
I can't see any difference between these branches. It's probably
remnants from _bin collations, where we don't have to do table
translation and thus the "dest == src" case is degenerate, e.g.:
static size_t my_strnxfrm_
{
if (dest != src)
memcpy(dest, src, min(dstlen,
if (dstlen > srclen)
bfill(dest + srclen, dstlen - srclen, 0);
return dstlen;
}
But the "if()" statement in my_strnxfrm_
executed for each row processed by filesort and shows high branch
misprediction numbers in sysbench RO runs.
Related branches
lp://staging/~akopytov/percona-server/bug1132350
- Sergei Glushchenko (community): Approve (g2)
-
Diff: 34 lines (+9/-11)1 file modifiedPercona-Server/strings/ctype-simple.c (+9/-11)
lp://staging/~laurynas-biveinis/percona-server/5.6-merge-1
- Alexey Kopytov (community): Approve
- Percona core: Pending requested
-
Diff: 60833 lines (+35068/-6890)650 files modified.bzrignore (+0/-1)
COPYING.innodb-deadlock-count-patch (+0/-30)
COPYING.show_temp_51 (+0/-13)
Makefile (+0/-78)
Percona-Server/CMakeLists.txt (+7/-0)
Percona-Server/client/CMakeLists.txt (+2/-1)
Percona-Server/client/client_priv.h (+3/-0)
Percona-Server/client/mysql.cc (+55/-1)
Percona-Server/client/mysqldump.c (+7/-3)
Percona-Server/client/sql_string.cc (+44/-0)
Percona-Server/client/sql_string.h (+10/-0)
Percona-Server/cmake/dtrace.cmake (+1/-1)
Percona-Server/cmake/install_layout.cmake (+2/-2)
Percona-Server/config.h.cmake (+1/-1)
Percona-Server/extra/comp_err.c (+130/-49)
Percona-Server/extra/innochecksum.cc (+76/-2)
Percona-Server/include/atomic/x86-gcc.h (+12/-16)
Percona-Server/include/heap.h (+69/-12)
Percona-Server/include/m_string.h (+40/-0)
Percona-Server/include/my_getopt.h (+18/-0)
Percona-Server/include/my_sys.h (+11/-9)
Percona-Server/include/mysql/plugin.h (+22/-0)
Percona-Server/include/mysql/plugin_audit.h.pp (+13/-0)
Percona-Server/include/mysql/plugin_auth.h.pp (+13/-0)
Percona-Server/include/mysql/plugin_ftparser.h.pp (+13/-0)
Percona-Server/include/mysql_com.h (+15/-0)
Percona-Server/include/violite.h (+1/-1)
Percona-Server/internal/mysql-test/suite/i_innodb/r/dummy.result (+1/-0)
Percona-Server/internal/mysql-test/suite/i_innodb/t/dummy.test (+3/-0)
Percona-Server/internal/mysql-test/suite/i_main/r/dummy.result (+1/-0)
Percona-Server/internal/mysql-test/suite/i_main/r/update.result (+17/-0)
Percona-Server/internal/mysql-test/suite/i_main/t/dummy.test (+2/-0)
Percona-Server/internal/mysql-test/suite/i_main/t/update.test (+21/-0)
Percona-Server/man/mysqld.8 (+69/-0)
Percona-Server/mysql-test/include/have_64_keys.inc (+12/-0)
Percona-Server/mysql-test/include/log_cleanup.inc (+1/-0)
Percona-Server/mysql-test/include/log_grep.inc (+41/-0)
Percona-Server/mysql-test/include/log_start.inc (+11/-0)
Percona-Server/mysql-test/include/log_stop.inc (+7/-0)
Percona-Server/mysql-test/include/percona_processlist_row_stats_show.inc (+7/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments.inc (+95/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments_begin.inc (+12/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments_clear.inc (+5/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments_end.inc (+3/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments_eval.inc (+7/-0)
Percona-Server/mysql-test/include/percona_query_cache_with_comments_show.inc (+8/-0)
Percona-Server/mysql-test/include/percona_show_slave_status_nolock.inc (+56/-0)
Percona-Server/mysql-test/include/percona_slow_log_verbosity_grep.inc (+26/-0)
Percona-Server/mysql-test/include/percona_slow_query_log_rate.inc (+37/-0)
Percona-Server/mysql-test/r/connect.result (+2/-0)
Percona-Server/mysql-test/r/create.result (+6/-5)
Percona-Server/mysql-test/r/ctype_utf8mb4_heap.result (+4/-0)
Percona-Server/mysql-test/r/derived.result (+1/-1)
Percona-Server/mysql-test/r/disabled_replication.result (+2/-1)
Percona-Server/mysql-test/r/group_commit_crash.result (+101/-0)
Percona-Server/mysql-test/r/have_64_keys.require (+14/-0)
Percona-Server/mysql-test/r/information_schema.result (+30/-2)
Percona-Server/mysql-test/r/information_schema_db.result (+7/-0)
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Percona-Server/mysql-test/r/percona_innodb_deadlock_count.result (+28/-0)
Percona-Server/mysql-test/r/percona_innodb_fake_changes.result (+119/-0)
Percona-Server/mysql-test/r/percona_innodb_fake_changes_bug_898306.result (+43/-0)
Percona-Server/mysql-test/r/percona_innodb_fake_changes_bug_917942.result (+151/-0)
Percona-Server/mysql-test/r/percona_innodb_fake_changes_locks.result (+83/-0)
Percona-Server/mysql-test/r/percona_innodb_version.result (+3/-0)
Percona-Server/mysql-test/r/percona_log_connection_error.result (+16/-0)
Percona-Server/mysql-test/r/percona_log_slow_admin_statements-config.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_admin_statements-config_false.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_admin_statements-config_foo.result (+7/-0)
Percona-Server/mysql-test/r/percona_log_slow_admin_statements-config_true.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_admin_statements.result (+20/-0)
Percona-Server/mysql-test/r/percona_log_slow_filter-cl.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_innodb.result (+42/-0)
Percona-Server/mysql-test/r/percona_log_slow_query_plan.result (+268/-0)
Percona-Server/mysql-test/r/percona_log_slow_query_plan_qc.result (+46/-0)
Percona-Server/mysql-test/r/percona_log_slow_slave_statements-cl.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_slave_statements-innodb.result (+31/-0)
Percona-Server/mysql-test/r/percona_log_slow_slave_statements.result (+33/-0)
Percona-Server/mysql-test/r/percona_log_slow_sp_statements-cl.result (+6/-0)
Percona-Server/mysql-test/r/percona_log_slow_sp_statements.result (+27/-0)
Percona-Server/mysql-test/r/percona_log_slow_verbosity-cl.result (+6/-0)
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Percona-Server/mysql-test/r/percona_log_warnings_suppress.result (+31/-0)
Percona-Server/mysql-test/r/percona_long_query_time.result (+35/-0)
Percona-Server/mysql-test/r/percona_min_examined_row_limit.result (+35/-0)
Percona-Server/mysql-test/r/percona_mysqldump_innodb_optimize_keys.result (+0/-443)
Percona-Server/mysql-test/r/percona_processlist_row_stats.result (+70/-0)
Percona-Server/mysql-test/r/percona_query_cache_with_comments.result (+866/-0)
Percona-Server/mysql-test/r/percona_query_cache_with_comments_crash.result (+21/-0)
Percona-Server/mysql-test/r/percona_query_cache_with_comments_disable.result (+865/-0)
Percona-Server/mysql-test/r/percona_query_cache_with_comments_prepared_statements.result (+396/-0)
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Percona-Server/mysql-test/r/percona_show_slave_status_nolock.result (+72/-0)
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Percona-Server/mysql-test/r/percona_slow_extended_log_error.result (+17/-0)
Percona-Server/mysql-test/r/percona_slow_query_log_rate.result (+54/-0)
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Percona-Server/mysql-test/r/percona_utility_user.result (+91/-0)
Percona-Server/mysql-test/r/percona_xtradb_bug317074.result (+5/-0)
Percona-Server/mysql-test/r/rpl_mysqldump_slave.result (+1/-1)
Percona-Server/mysql-test/r/show_check.result (+6/-6)
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Percona-Server/mysql-test/r/userstat_bug602047.result (+19/-0)
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Percona-Server/mysql-test/suite/binlog/r/binlog_stm_mix_innodb_myisam.result (+2/-2)
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Percona-Server/mysql-test/suite/innodb/include/percona_innodb_kill_idle_trx_show.inc (+2/-0)
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Percona-Server/mysql-test/suite/innodb/r/percona_changed_page_bmp.result (+67/-0)
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Percona-Server/mysql-test/suite/innodb/r/percona_changed_page_bmp_log_block_size.result (+7/-0)
Percona-Server/mysql-test/suite/innodb/r/percona_changed_page_bmp_requests.result (+76/-0)
Percona-Server/mysql-test/suite/innodb/r/percona_changed_page_bmp_requests_no_innodb.result (+4/-0)
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Percona-Server/mysql-test/suite/innodb/r/percona_innodb_kill_idle_trx.result (+39/-0)
Percona-Server/mysql-test/suite/innodb/r/percona_innodb_kill_idle_trx_locks.result (+45/-0)
Percona-Server/mysql-test/suite/innodb/r/percona_log_block_size.result (+11/-0)
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Percona-Server/mysql-test/suite/innodb/t/bug54330.test (+38/-0)
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Percona-Server/mysql-test/suite/innodb/t/percona_bug_951588.test (+29/-0)
Percona-Server/mysql-test/suite/innodb/t/percona_bug_999147-master.opt (+0/-1)
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Percona-Server/mysql-test/suite/innodb/t/percona_changed_page_bmp-master.opt (+1/-0)
Percona-Server/mysql-test/suite/innodb/t/percona_changed_page_bmp.test (+253/-0)
Percona-Server/mysql-test/suite/innodb/t/percona_changed_page_bmp_1105726-master.opt (+1/-0)
Percona-Server/mysql-test/suite/innodb/t/percona_changed_page_bmp_1105726.test (+5/-0)
Percona-Server/mysql-test/suite/innodb/t/percona_changed_page_bmp_crash-master.opt (+1/-0)
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doc/source/management/innodb_fake_changes.rst (+70/-0)
doc/source/management/innodb_fast_index_creation.rst (+63/-0)
doc/source/management/innodb_kill_idle_trx.rst (+25/-0)
doc/source/management/pam_plugin.rst (+72/-0)
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doc/source/management/udf_maatkit.rst (+49/-0)
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doc/source/performance/innodb_numa_support.rst (+66/-0)
doc/source/performance/query_cache_enhance.rst (+123/-0)
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doc/source/release-notes/Percona-Server-5.6.6-60.1.rst (+0/-18)
doc/source/release-notes/release-notes_index.rst (+0/-11)
doc/source/reliability/error_pad.rst (+55/-0)
doc/source/reliability/log_connection_error.rst (+14/-0)
doc/source/reliability/show_slave_status_nolock.rst (+23/-0)
doc/source/upstream-bug-fixes.rst (+0/-19)
lrusort.py (+0/-38)
subunit2junitxml (+0/-65)
uninstall_tests.sh (+0/-24)
Revision history for this message
| Shahriyar Rzayev (rzayev-sehriyar) wrote | #1 |
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Percona now uses JIRA for bug reports so this bug report is migrated to: https:/