Hướng dẫn mysql high cpu usage centos 7 - mysql sử dụng cpu cao centos 7

Tôi có máy chủ chuyên dụng i7 3770 với RAM 32 GB và Centos7 được cài đặt, dưới đây là chi tiết CPU

[root@server ~]# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 58
Model name:            Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Stepping:              9
CPU MHz:               1712.218
BogoMIPS:              6799.29
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

Và MySQL đang sử dụng quá nhiều CPU trên đó. Tôi đang sử dụng nó để lưu trữ web và không có tài khoản đòi hỏi quá nhiều với rất nhiều lượt truy cập. Cơ sở dữ liệu được trộn lẫn, một số là Innodb và những người khác là Myisam, và tôi không thể biến tất cả chúng thành Innodb hoặc Myisam, nó cần phải ở lại như thế này.

Đây là cấu hình MySQL của tôi

[mysqld]
default-storage-engine=InnoDB
performance-schema=0
max_allowed_packet=268435456
join_buffer_size = 24M
explicit_defaults_for_timestamp = 1
read_rnd_buffer_size=1024K
read_buffer_size=4M
sort_buffer_size=4M
table_open_cache=8000
key_buffer_size=2G
local-infile=0
tmp_table_size=32M
max_heap_table_size=32M
slow_query_log=1
slow_query_log_file="/var/log/mysql-slow-queries.log"
long_query_time=10

innodb_buffer_pool_size=10G
innodb_buffer_pool_instances = 10
innodb_log_file_size=1024M
innodb_file_per_table=1
innodb_flush_method=O_DIRECT
innodb_autoinc_lock_mode=0
innodb_read_io_threads=4
innodb_write_io_threads=8

Kết quả điều chỉnh mysql là cái này

 -------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA
[--] Data in MyISAM tables: 911M (Tables: 2990)
[--] Data in InnoDB tables: 3G (Tables: 2349)
[--] Data in MEMORY tables: 0B (Tables: 38)
[OK] Total fragmented tables: 0

-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] User 'darssopt_mi@%' hasn't specific host restriction.
[!!] User 'darssoptions@%' hasn't specific host restriction.
[!!] There is no basic password file list!

-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 6h 22m 27s (1M q [79.246 qps], 264K conn, TX: 6G, RX: 190M)
[--] Reads / Writes: 93% / 7%
[--] Binary logging is disabled
[--] Physical Memory     : 31.0G
[--] Max MySQL memory    : 17.0G
[--] Other process memory: 1.4G
[--] Total buffers: 12.0G global + 33.2M per thread (151 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 12.8G (41.33% of installed RAM)
[OK] Maximum possible memory usage: 17.0G (54.76% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (21/1M)
[OK] Highest usage of available connections: 15% (23/151)
[OK] Aborted connections: 0.08%  (219/264034)
[!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 3% (8K temp sorts / 235K sorts)
[!!] Joins performed without indexes: 3128
[OK] Temporary tables created on disk: 19% (22K on disk / 115K total)
[OK] Thread cache hit rate: 99% (775 created / 264K connections)
[OK] Table cache hit rate: 99% (5K open / 6K opened)
[OK] Open file limit used: 15% (6K/40K)
[OK] Table locks acquired immediately: 99% (1M immediate / 1M locks)

-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.

-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is disabled.

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.6% (399M used / 2B cache)
[OK] Key buffer size / total MyISAM indexes: 2.0G/181.8M
[OK] Read Key buffer hit rate: 100.0% (79M cached / 8K reads)
[!!] Write Key buffer hit rate: 93.5% (460K cached / 29K writes)

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is disabled.

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[OK] InnoDB buffer pool / data size: 10.0G/3.4G
[OK] InnoDB buffer pool instances: 10
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[OK] InnoDB Read buffer efficiency: 100.00% (4991812913 hits/ 4991885443 total)
[!!] InnoDB Write Log efficiency: 41.29% (38836 hits/ 94048 total)
[OK] InnoDB log waits: 0.00% (0 waits / 55212 writes)

-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.

-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.

-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] This is a standalone server.

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    Restrict Host for user@% to user@SpecificDNSorIp
    MySQL started within last 24 hours - recommendations may be inaccurate
    Configure your accounts with ip or subnets only, then update your configuration with skip-name-resolve=1
    Adjust your join queries to always utilize indexes. Please note this
    calculation is made by adding Select_full_join + Select_range_check
    status values and triggered when the total >250
Variables to adjust:
    join_buffer_size (> 24.0M, or always use indexes with joins)

Kết quả hàng đầu

  top - 14:51:35 up 4 days, 22:36,  3 users,  load average: 5.88, 5.85, 6.11
Tasks: 275 total,   3 running, 271 sleeping,   0 stopped,   1 zombie
%Cpu(s):  9.1 us,  0.8 sy,  0.1 ni, 67.1 id, 22.9 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 32460092 total,  1248560 free,  5231404 used, 25980128 buff/cache
KiB Swap: 16760828 total, 16506348 free,   254480 used. 26023012 avail Mem

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 670307 mysql     20   0 15.638g 3.728g   8680 S  62.1 12.0 103:40.03 mysqld
 792649 adv+      20   0  235404  29852   8320 R   3.3  0.1   0:00.10 php-cgi
 792670 bdd       20   0  226492  20820   8292 R   1.3  0.1   0:00.04 php-cgi
   3359 root      30  10  277760  30508   2720 D   0.7  0.1  30:35.10 python2.7
     17 root      20   0       0      0      0 S   0.3  0.0  13:27.67 rcu_sched
     19 root      20   0       0      0      0 S   0.3  0.0  12:00.05 rcuos/1
     21 root      20   0       0      0      0 S   0.3  0.0   3:48.60 rcuos/3
    469 root       0 -20       0      0      0 S   0.3  0.0   8:35.86 kworker/+
    545 root      20   0       0      0      0 D   0.3  0.0   3:40.02 jbd2/md2+
   3336 root      30  10  417280   9084   1244 S   0.3  0.0  16:16.79 python2.7
 599324 root      20   0  107804  28732   2080 S   0.3  0.1   0:06.44 tailwatc+
 670290 root      20   0  186500  18572   3344 S   0.3  0.1   0:02.42 cPhulkd +
 792376 nobody    20   0  216284  24376   2428 S   0.3  0.1   0:00.02 httpd
 792449 superst   20   0   19972   2852   2116 S   0.3  0.0   0:00.05 pop3
 792498 root      20   0  155924   2356   1544 R   0.3  0.0   0:00.07 top
      1 root      20   0  338544   3812   2176 S   0.0  0.0   2:43.82 systemd
      2 root      20   0       0      0      0 S   0.0  0.0   0:00.18 kthreadd

Đây là kết quả của Iostat

[root@server ~]# iostat
Linux 3.10.0-427.36.1.lve1.4.40.el7.x86_64 (server.connect.rs)  03/23/2017     _x86_64_ (8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           4.12    0.42    0.68   16.87    0.00   77.92

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sdb              65.24      2957.95       981.59 1264085940  419483991
sda              68.70      2749.45       981.59 1174981406  419483991
md1               0.00         0.05         0.00      23171         38
md0               0.70         0.87         1.92     370128     820580
md3              42.31       496.39       318.45  212134125  136090304
md2              68.18       104.71       650.46   44746045  277975140

Mysql hầu như luôn luôn trên 40%, lên tới 100%

Hôm qua tôi đã thêm dịch vụ MySQL bị vô hiệu hóa trong 5 phút và tải dưới 1.

Vui lòng tư vấn làm thế nào để cải thiện nó

Tại sao CPU MySQL lại cao như vậy?

Cách dễ nhất để giảm việc sử dụng CPU cơ sở dữ liệu SQL của bạn là gì?

MySQL có thể sử dụng nhiều lõi không?

Làm thế nào tôi có thể xem những truy vấn nào đang chạy trên MySQL?