Re: Mysql 5.6: Are these calculations for innodb_buffer_pool_size and instances correct?
Posted by: Cesar Murilo Cesar
Date: November 02, 2020 10:28AM

Why would 70% be safer? In the case, 11.2 out of 16GB, so then 11 started. I have never seen any problem logs related to this, I just want to make everything OK. When starting Mysql the messages below appear, see that it recommends to increase the innodb_buffer_pool_size, even having 12 of 16GB of RAM. I think there is already a lot, it must be because there are only 8 instances.

191223 14:42:39 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
191223 14:42:39 [Note] /usr/libexec/mysqld (mysqld 10.0.38-MariaDB) starting as process 20259 ...
191223 14:42:39 [Note] InnoDB: Using mutexes to ref count buffer pool pages
191223 14:42:39 [Note] InnoDB: The InnoDB memory heap is disabled
191223 14:42:39 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
191223 14:42:39 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
191223 14:42:39 [Note] InnoDB: Compressed tables use zlib 1.2.11
191223 14:42:39 [Note] InnoDB: Using Linux native AIO
191223 14:42:39 [Note] InnoDB: Using CPU crc32 instructions
191223 14:42:39 [Note] InnoDB: Initializing buffer pool, size = 12.0G
191223 14:42:40 [Note] InnoDB: Completed initialization of buffer pool
191223 14:42:40 [Note] InnoDB: Highest supported file format is Barracuda.
191223 14:42:40 [Note] InnoDB: 128 rollback segment(s) are active.
191223 14:42:40 [Note] InnoDB: Waiting for purge to start
191223 14:42:40 [Note] InnoDB: Percona XtraDB ( 5.6.42-84.2 started; log sequence number 1087485363986
191223 14:42:40 [Note] Plugin 'FEEDBACK' is disabled.
191223 14:42:40 [Note] /usr/libexec/mysqld: ready for connections.
Version: '10.0.38-MariaDB' socket: '/var/run/mysql/mysql.sock' port: 0 MariaDB Server
2020-10-02 18:13:34 7f58c9b63700 InnoDB: Warning: difficult to find free blocks in
InnoDB: the buffer pool (338 search iterations)!
InnoDB: 0 failed attempts to flush a page! Consider
InnoDB: increasing the buffer pool size.
InnoDB: It is also possible that in your Unix version
InnoDB: fsync is very slow, or completely frozen inside
InnoDB: the OS kernel. Then upgrading to a newer version
InnoDB: of your operating system may help. Look at the
InnoDB: number of fsyncs in diagnostic info below.
InnoDB: Pending flushes (fsync) log: 0; buffer pool: 0
InnoDB: 300056782 OS file reads, 860652373 OS file writes, 235885516 OS fsyncs
InnoDB: Starting InnoDB Monitor to print further
InnoDB: diagnostics to the standard output.

Options: ReplyQuote

Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.