my.cnf MariaDB 配置 - 即使进行了优化,仍达到 CPU 上限

my.cnf MariaDB 配置 - 即使进行了优化,仍达到 CPU 上限

我正在尝试解决 mySQL 在 CPU/服务器负载方面达到上限的问题,因为服务器规格如下:

  • 项目清单

  • 2 x 2.4GHz 八核 E5-2630 v3 Haswell Xeon

  • 128GB 内存
  • SSD 主驱动器
  • CloudLinux 7.5
  • MariaDB 10.2.16
  • LiteSpeed 5.2.8

在以下配置下,mySQL/MariaDB 的 CPU 使用率会不断达到 80-150% 之间,给服务器带来很大压力。

关于我可以调整/启用/禁用/添加/删除什么来使 mySQL 减少 CPU 占用,有什么建议吗?因为 RAM 使用率稳定在 25% 以下,但 CPU 却经常飙升。

[mysqld]
skip_name_resolve               = 1
default_storage_engine          = InnoDB
log_error                       = /var/lib/mysql/mysql_log.err
performance_schema              = 0
sql_mode                        = "NO_ENGINE_SUBSTITUTION"

max_allowed_packet              = 256M
max_connections                 = 400
open_files_limit                = 10000
wait_timeout                    = 120
connect_timeout                 = 120
interactive_timeout             = 180
tmpdir                          = /var/lib/mysql/tmp
tmp_table_size                  = 256M
max_heap_table_size             = 256M
max_tmp_tables                  = 300
max_statement_time              = 60
innodb_strict_mode              = OFF
#innodb_file_per_table          = ON

slow_query_log                  = ON
slow_query_log_file             = /var/lib/mysql/mysql_slow_queries.log
long_query_time                 = 10

table_open_cache                = 128
table_open_cache_instances      = 16
query_cache_type                = ON
query_cache_size                = 256M
thread_cache_size               = 40
query_cache_limit               = 300M 
key_buffer_size                 = 3G
join_buffer_size                = 512M
max_heap_table_size             = 16M

innodb_buffer_pool_size         = 64G  #80% of system memory?
innodb_log_file_size            = 2G
#innodb_log_buffer_size         = 1G
innodb_buffer_pool_instances    = 12
innodb_file_format              = Barracuda
#innodb_max_dirty_pages_pct     = 0
#innodb_io_capacity             = 400
#innodb_io_capacity_max         = 600
#innodb_flush_sync              = OFF
innodb_buffer_pool_dump_pct     = 80
innodb_flush_log_at_trx_commit  = 0 #or 2
sync_binlog                     = 0
innodb_flush_method             = O_DIRECT
innodb_thread_concurrency       = 8
innodb_read_ahead_threshold     = 8

concurrent_insert               = 1
local_infile                    = 0
group_concat_max_len            = 102400

以下是所有可能有助于更好地了解环境的相关阅读:

答案1

针对 my.cnf [mysqld] 部分需要考虑的建议 每秒速率 = RPS

thread_handling=pool-of-threads  # from one-thread-per-connection for scalability
max_heap_table_size=512M  # from 16M to increase RAM capacity
tmp_table_size=512M # from 256K 2 be = max_heap_table_size and reduce created_tmp_disk_tables
innodb_io_capacity=10000  # from 200 limit for SSD possible RPS
read_buffer_size=256K  # from 128K to reduce handler_read_next RPS
read_rnd_buffer_size=192K  # from 256K to reduce handler_read_rnd_nxt RPS
aria_pagecache_division_limit=50  # from 100 for WARM cache
key_cache_division_limit=50  # from 100 for WARM cache
innodb_buffer_pool_instances=8  # from 12 for your current data volume
innodb_buffer_pool_size=24G  # from 64G to support 11G of data with room to grow
innodb_lru_scan_depth=100  # from 1024 to reduce CPU every SECOND see refman
innodb_thread_concurrency=0  # from 8 see dba.stackexchange Question 5666

如需更多建议,请查看个人资料、网络资料中的联系信息(包括 Skype ID)。

还有更多机会可以提高您的系统性能。

ulimit -n 48000 会非常有用。测试后,将其持久化。

记住每天只能更改一次,监控,下一次更改在 24 小时或更长时间后进行。如果任何更改是有害的,请在将其从 my.cnf 中删除后通知我 @wilsonhauck。

请在几天内让我们知道您的进展。

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