voltdb开启时遇到Transparent huge pages (THP) not supported问题

问题描述：
bin/voltdb create

ERROR: The kernel is configured to use transparent huge pages (THP). This is not supported when running VoltDB. Use the following commands to disable this feature for the current session:

ERROR: 

ERROR: sudo bash -c "echo never > /sys/kernel/mm/transparent_hugepage/enabled"

ERROR: sudo bash -c "echo never > /sys/kernel/mm/transparent_hugepage/defrag"

ERROR: 

ERROR: To disable THP on reboot, add the preceding commands to the /etc/rc.local file.

解决办法:

解决办法1：执行如下两句命令

sudo bash -c "echo never > /sys/kernel/mm/transparent_hugepage/enabled"

sudo bash -c "echo never > /sys/kernel/mm/transparent_hugepage/defrag"

但是重启系统后失效

解决办法2：修改/etc/rc.local配置文件，重启后依然生效(ubuntu下作如下修改)

#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

touch /var/lock/subsys/local

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

exit 0

问题产生原因：

voltDB是内存数据库，适当的内存管理对有效的运行VoltDB至关重要，而使用透明大爷是voltDB提升性能的一种方式。



可参考：https://forum.voltdb.com/showthread.php?1529-Transparent-huge-pages-(THP)-not-supported