Upstream bug https://bugs.mysql.com/bug.php?id=68079 is fixed since 5.6.16. To fix it new CMake option was introduced, INNODB_PAGE_ATOMIC_REF_COUNT.
This option is visible in the code (MariaDB 10.1, cloned today):
[openxs@centos server]$ git branch
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* 10.1
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[openxs@centos server]$ grep -rni INNODB_PAGE_ATOMIC_REF_COUNT *
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storage/innobase/include/buf0types.h:29:#if defined(INNODB_PAGE_ATOMIC_REF_COUNT) && defined(HAVE_ATOMIC_BUILTINS)
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storage/innobase/include/buf0types.h:31:#endif /* INNODB_PAGE_ATOMIC_REF_COUNT && HAVE_ATOMIC_BUILTINS */
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storage/xtradb/include/buf0types.h:29:#if defined(INNODB_PAGE_ATOMIC_REF_COUNT) && defined(HAVE_ATOMIC_BUILTINS)
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storage/xtradb/include/buf0types.h:31:#endif /* INNODB_PAGE_ATOMIC_REF_COUNT && HAVE_ATOMIC_BUILTINS */
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[openxs@centos server]$
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But, as you can see, it is not mentioned in CMakeLists.txt and (probably for this reason) is not used. In the error logs of 10.0.23 we see:
160721 14:22:06 [Note] /home/openxs/10.0.23/bin/mysqld (mysqld 10.0.23-MariaDB-log) starting as process 2418 ...
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160721 14:22:06 [Note] InnoDB: Using mutexes to ref count buffer pool pages
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even though this version already uses InnoDB 5.6.26. For comparison, Percona Server 5.6.28 starts like this:
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...
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2016-02-24 18:25:37 1814 [Note] InnoDB: Using atomics to ref count buffer pool p
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ages
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2016-02-24 18:25:37 1814 [Note] InnoDB: The InnoDB memory heap is disabled
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2016-02-24 18:25:37 1814 [Note] InnoDB: Mutexes and rw_locks use GCC atomic buil
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tins
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2016-02-24 18:25:37 1814 [Note] InnoDB: Memory barrier is not used
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2016-02-24 18:25:37 1814 [Note] InnoDB: Compressed tables use zlib 1.2.3
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2016-02-24 18:25:37 1814 [Note] InnoDB: Using Linux native AIO
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2016-02-24 18:25:37 1814 [Note] InnoDB: Not using CPU crc32 instructions
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2016-02-24 18:25:37 1814 [Note] InnoDB: Initializing buffer pool, size = 5.0M
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2016-02-24 18:25:37 1814 [Note] InnoDB: Completed initialization of buffer pool
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2016-02-24 18:25:37 1814 [Note] InnoDB: Highest supported file format is Barracu
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da.
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2016-02-24 18:25:38 1814 [Note] InnoDB: 128 rollback segment(s) are active.
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2016-02-24 18:25:38 1814 [Note] InnoDB: Waiting for purge to start
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2016-02-24 18:25:39 1814 [Note] InnoDB: Percona XtraDB (http://www.percona.com)
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5.6.28-76.1 started; log sequence number 1017098584
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...
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In the code of current upstream MySQL 5.6 we see:
[openxs@centos mysql-server]$ grep -rni INNODB_PAGE_ATOMIC_REF_COUNT *
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CMakeLists.txt:332:OPTION(INNODB_PAGE_ATOMIC_REF_COUNT "Use atomics for the page reference count"
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CMakeLists.txt:334:MARK_AS_ADVANCED(INNODB_PAGE_ATOMIC_REF_COUNT)
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config.h.cmake:552:#cmakedefine INNODB_PAGE_ATOMIC_REF_COUNT
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storage/innobase/include/buf0types.h:29:#if defined(INNODB_PAGE_ATOMIC_REF_COUNT) && defined(HAVE_ATOMIC_BUILTINS)
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storage/innobase/include/buf0types.h:31:#endif /* INNODB_PAGE_ATOMIC_REF_COUNT && HAVE_ATOMIC_BUILTINS */
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[openxs@centos mysql-server]$ git branch
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* 5.6
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5.7
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I know there were problems with this option on Windows long time ago, but is it a good reason to NOT use it and related InnoDB scalability improvements?
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Bug
Major
Page Failed to load