Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about how to analyze the process of opening large pages of memory in centos. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

# # OS sets the corresponding kernel parameters according to the machine condition

# # according to 100g allocation, the data volume of large pages is 51200

Echo 51200 > / proc/sys/vm/nr_hugepages

# # adding user groups that can use large pages of memory

# # uid=1000 (mysql) gid=1002 (dba) groups=1002 (dba), 4 (adm)

Echo 1002 > / proc/sys/vm/hugetlb_shm_group

# # set the size of the shared memory segment allowed by the kernel. This is 90g.

Echo 96636764160 > / proc/sys/kernel/shmmax

# # set the number of shared memory segments and the size of the shared memory page is 4kMagol 90G 90g 1024mm 1024Accord4

Echo 23592960 > / proc/sys/kernel/shmall

# # setting never opens a large transparent page

Echo never > / sys/kernel/mm/transparent_hugepage/enabled

# # set permanent memory defragmentation

Echo never > / sys/kernel/mm/transparent_hugepage/defrag

# # write kernel parameters into the self-startup script to prevent invalidation after restart

Vi / etc/rc.local

# # add corresponding file restrictions:

[root@MYSQL-DB1] # tail-2 / etc/security/limits.conf

Mysql hard memlock unlimited

Mysql soft memlock unlimited

# # adding corresponding configuration parameters for mysql

[mysql@MYSQL-DB1 ~] $cat my3306.cnf | grep innodb_buffer_pool_

Innodb_buffer_pool_size=80G

Innodb_buffer_pool_dump_at_shutdown=1

Innodb_buffer_pool_load_at_startup=1

[mysql@MYSQL-DB1 ~] $cat my3306.cnf | grep page

Large-pages

# # restart mysql

The above is the editor for you to share how to analyze centos to open the process of large-page memory, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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