InnoDB Buffer pool not showing as much I configured in MariaDB 10.5

Question

I'm using MariaDB 10.5 on Centos7 with 4G RAM and 2 CPU.

Here's my.cnf configuration

[mysqld]
log-error=/var/lib/mysql/mysql-3.kannel.com.err
max_allowed_packet=1G

event_scheduler = ON
innodb_file_per_table=ON
#innodb_file_format=Barracuda
innodb_buffer_pool_size=3G
innodb_buffer_pool_instances=6
innodb_log_file_size=1G
innodb_log_files_in_group=1
innodb_log_buffer_size=32M
innodb_log_write_ahead_size=32M
innodb_flush_log_at_trx_commit=2
innodb_read_io_threads=32
innodb_write_io_threads=128
innodb_io_capacity=10000
innodb_thread_concurrency=6
innodb_flush_method=o_direct


join_buffer_size=128M
sort_buffer_size=20M
read_rnd_buffer_size=128M
datadir=/var/lib/mysql
open_files_limit=10000
default-storage-engine=InnoDB
max_connections = 500

# CACHES AND LIMITS #
tmp-table-size                 = 20M
max-heap-table-size            = 32M
query-cache-type               = 1
thread-cache-size              = 50M
table-definition-cache        = 128M
table-open-cache               = 128M
query_cache_size = 50M
query_cache_limit=128M

But when I see InnoDB engine status using SHOW ENGINE INNODB STATUS\G; it gives me below information where Buffer pool size 193296 but Total large memory allocated 3288334336

BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 3288334336
Dictionary memory allocated 19166328
Buffer pool size   193296
Free buffers       179141
Database pages     49186
Old database pages 18176

So if Buffer pool size 193296, where rest of the memory is being allocated?

Thanks!

Answer 1

It is unsafe to raise values arbitrarily. It often leads to swapping, which makes performance worse.

max_allowed_packet=1G  -- dangerously high; wastes RAM; set to 1% of RAM
innodb_buffer_pool_size=3G   --Since you have only 4GB, lower to 2G
innodb_buffer_pool_instances=6  -- only 1 per GB, so: 2
innodb_log_files_in_group=1   -- Use the standard of 2
innodb_log_write_ahead_size=32M  -- waste of RAM; leave at default (8K)
innodb_write_io_threads=128  -- too high
innodb_io_capacity=10000   -- do you have a super-duper SSD?  Else too high
join_buffer_size=128M    -- lower to 1% of RAM
read_rnd_buffer_size=128M  -- lower to 1% of RAM
max_connections = 500    -- the default will save RAM

As for "Buffer pool size 193296" -- That is pages. Multiply by 16K to get about 3G. So it is not "small".