Hi, All
When set slave_parallel_threads = 2 at Fusion-IO device, after 10 minutes, both slave io thead and sql thread status is normal , but Exec_Master_Log_Pos value not change,.
The Same slave database run normal at HDD , at the time , run stop slave sqlthread is Hang and not Error log .

kill -9 `pidof mysqld`
/etc/init.d/mysql start

error log :
151215 19:55:18 mysqld_safe Starting mysqld daemon with databases from /data/mysql/data
151215 19:55:18 [Note] /usr/sbin/mysqld (mysqld 10.0.22-MariaDB-log) starting as process 23665 ...
151215 19:55:19 [Note] InnoDB: Using mutexes to ref count buffer pool pages
151215 19:55:19 [Note] InnoDB: The InnoDB memory heap is disabled
151215 19:55:19 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
151215 19:55:19 [Note] InnoDB: Memory barrier is not used
151215 19:55:19 [Note] InnoDB: Compressed tables use zlib 1.2.3
151215 19:55:19 [Note] InnoDB: Using Linux native AIO
151215 19:55:19 [Note] InnoDB: Using CPU crc32 instructions
151215 19:55:19 [Note] InnoDB: Initializing buffer pool, size = 32.0G
151215 19:55:20 [Note] InnoDB: Completed initialization of buffer pool
151215 19:55:20 [Note] InnoDB: Opened 4 undo tablespaces
151215 19:55:20 [Note] InnoDB: Highest supported file format is Barracuda.
151215 19:55:20 [Note] InnoDB: The log sequence numbers 40295828165930 and 40295828165930 in ibdata files do not match the log sequence number 40312557761593 in the ib_logfiles!
151215 19:55:20 [Note] InnoDB: Database was not shutdown normally!
151215 19:55:20 [Note] InnoDB: Starting crash recovery.
151215 19:55:20 [Note] InnoDB: Reading tablespace information from the .ibd files...
151215 19:55:20 [Note] InnoDB: Restoring possible half-written data pages
151215 19:55:20 [Note] InnoDB: from the doublewrite buffer...
InnoDB: Last MySQL binlog file position 0 212127544, file name /data/mysql/log/mysql-bin.000046
151215 19:55:21 [Note] InnoDB: 128 rollback segment(s) are active.
151215 19:55:21 [Note] InnoDB: Waiting for purge to start
151215 19:55:21 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.26-74.0 started; log sequence number 40312557761593
2015-12-15 19:55:21 7f2c663f9700 InnoDB: Loading buffer pool(s) from /data/mysql/data/ib_buffer_pool
151215 19:55:21 [Note] Plugin 'FEEDBACK' is disabled.
151215 19:55:21 server_audit: MariaDB Audit Plugin version 1.3.0 STARTED.
151215 19:55:21 [Note] Recovering after a crash using /data/mysql/log/mysql-bin
151215 19:55:21 [Note] Starting crash recovery...
151215 19:55:21 [Note] Crash recovery finished.
151215 19:55:21 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.0.22-MariaDB-log' socket: '/data/mysql/data/mysql.sock' port: 3306 MariaDB Server

attach file:
show engine innodb status, show engine innodb mutex, show slave status