Hugepages not utilized by MySQL 5.0, CentOS 5
- by TechZilla
I've set up Hugepages, but i'm not seeing any of them reserved.
Have I missed a step, or for some particular reason, is MySQL is unable to utilize the Hugepages? I have not created a mount of hugetlbfs, although from what I read, MySQL would not call pages in such a manner. If I'm wrong, please let me know, as that would be a trivial solution. Almost all my MySQL tables are using InnoDB.
NOTE: I created a hugetlbfs, no change as expected. Is it possible that rebooting would rectify this situation? I would not want to go through the procedure, as this is high availability, but would do so if necessary.
This is the configurations, which I believe are relevant.
/etc/sysctl.conf
...
## Huge Pages
vm.nr_hugepages = 4096
vm.hugetlb_shm_group = 27
## SHM
kernel.shmmax = 34359738368
kernel.shmall = 8589934592
...
/etc/security/limits.conf
...
mysql soft nofile 12888
mysql hard nofile 51552
@mysql soft memlock unlimited
@mysql hard memlock unlimited
/etc/my.cnf
[mysqld]
large-pages
...
grep Huge /proc/meminfo
HugePages_Total: 4096
HugePages_Free: 4096
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
id mysql
uid=27(mysql) gid=27(mysql) groups=27(mysql) context=root:system_r:unconfined_t:SystemLow-SystemHigh
tail -6 /var/log/mysqld.log
InnoDB: HugeTLB: Warning: Failed to allocate 1342193664 bytes. errno 12
InnoDB HugeTLB: Warning: Using conventional memory pool
120808 15:49:25 InnoDB: Started; log sequence number 0 1729804158
120808 15:49:25 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.0.95' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
I would really appreciate any help, I'm completely out of ideas. If I missed any more relevant configs, or diagnostics, please comment and I'll add it to the question.
