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I have an application that uses a MySQL 5.6 Server. This server is hosted on a Windows 8 VM on a server in our office closet. A coworker of mine sent me a picture of the mysqlId process consistantly oscillating betwee 2% CPU usage to 99% cpu usage. When it was installed, I selected the option that it was a dedicated server because that VM does only host the MySQL 5.6.

The queries throughput tends to max out at around 30 queries per second and 99% of these queries are answered in less than half a second, its rare we have longer queries.

Is this normal to how a MySQL 5.6 server operates CPU wise - the oscillating low to high CPU usage? Or is it possible to set events in MySQL I should look at? I did a SHOW EVENTS and I don't see any background scheduled tasks that would cause this. Is this normal or something I should trouble shoot and if so where else can I look to?

The only other potential answer I've found is High CPU usage from MySQL with no queries at all running but the link in the answer post is now broken. Perhaps someone knows if the leap second issue is still an outstanding one for MySQL 5.6 and that could be the cause?

Edit: Some additional information. SHOW FULL PROCESSLIST; only shows a handful of expected connections from our application.

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basedir C:\Program Files\MySQL\MySQL Server 5.6\
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SHOW GLOBAL STATUS;
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Qcache_free_blocks  3
Qcache_free_memory  11120
Qcache_hits 36494
Qcache_inserts  1254239
Qcache_lowmem_prunes    1223854
Qcache_not_cached   282771
Qcache_queries_in_cache 773
Qcache_total_blocks 1592
Queries 1583348
Questions   1579069
Select_full_join    1237141
Select_full_range_join  103
Select_range    4774
Select_range_check  0
Select_scan 58586
Slave_heartbeat_period  
Slave_last_heartbeat    
Slave_open_temp_tables  0
Slave_received_heartbeats   
Slave_retried_transactions  
Slave_running   OFF
Slow_launch_threads 0
Slow_queries    88
Sort_merge_passes   3906
Sort_range  597
Sort_rows   10827945
Sort_scan   28394
Ssl_accept_renegotiates 0
Ssl_accepts 0
Ssl_callback_cache_hits 0
Ssl_cipher  
Ssl_cipher_list 
Ssl_client_connects 0
Ssl_connect_renegotiates    0
Ssl_ctx_verify_depth    0
Ssl_ctx_verify_mode 0
Ssl_default_timeout 0
Ssl_finished_accepts    0
Ssl_finished_connects   0
Ssl_server_not_after    
Ssl_server_not_before   
Ssl_session_cache_hits  0
Ssl_session_cache_misses    0
Ssl_session_cache_mode  NONE
Ssl_session_cache_overflows 0
Ssl_session_cache_size  0
Ssl_session_cache_timeouts  0
Ssl_sessions_reused 0
Ssl_used_session_cache_entries  0
Ssl_verify_depth    0
Ssl_verify_mode 0
Ssl_version 
Table_locks_immediate   4223256
Table_locks_waited  0
Table_open_cache_hits   4224499
Table_open_cache_misses 977
Table_open_cache_overflows  0
Tc_log_max_pages_used   0
Tc_log_page_size    0
Tc_log_page_waits   0
Threads_cached  0
Threads_connected   14
Threads_created 18
Threads_running 3
Uptime  97668
Uptime_since_flush_status   97668
SHOW FULL PROCESSLIST;
13  root    192.168.1.227:49250 tab Sleep   254     
16  root    192.168.1.227:49254 tab Sleep   254     
17  root    192.168.1.227:49356 tab Sleep   126     
18  root    192.168.1.227:49357 tab Sleep   254     
19  root    192.168.1.227:49358 tab Sleep   253     
20  root    192.168.1.227:49359 tab Sleep   2       
21  root    192.168.1.227:49360 tab Sleep   9       
22  root    192.168.1.227:49361 tab Sleep   2       
25  root    192.168.1.161:49241 tab Sleep   3092        
26  root    192.168.1.161:49256 tab Sleep   3092        
28  root    localhost:49162     Sleep   309     
29  root    localhost:49163     Sleep   309     
30  root    192.168.1.152:50916 tab Query   0   init    SHOW FULL PROCESSLIST
31  root    192.168.1.152:50917 tab Sleep   407     
8
  • here is essential acopy see if oit helps atlassian.com/blog/archives/…, but it is normal for every program to grap all re4spurces initially to get the job done.
    – nbk
    May 20, 2020 at 17:46
  • 1
    Additional information request. RAM size, # cores, any SSD or NVME devices on MySQL Host server? Post on pastebin.com and share the links. From your SSH login root, Text results of: B) SHOW GLOBAL STATUS; after minimum 24 hours UPTIME C) SHOW GLOBAL VARIABLES; D) SHOW FULL PROCESSLIST; E) complete MySQLTuner report AND Optional helpful information, if available includes - htop OR top for most active apps, ulimit -a for a Linux/Unix list of limits, iostat -xm 5 3 for IOPS by device and core/cpu count, for server workload tuning analysis to provide suggestions. May 20, 2020 at 17:56
  • 1
    Thanks for the list of info. The VM has 16 gigs allocated, of which MySQL settings give it 8 to use. The rest of this is good info to try. Thanks for the insight. Added the GLOBAL VARIABLES and GLOBAL STATUS info to my post. I don't know what most of it means but hopefully it means something to you.
    – bjk116
    May 20, 2020 at 17:57
  • Hoping you can post the rest of the requested info, even if you think it is OK. Thanks for the SGS and SGV. May 20, 2020 at 18:04
  • 1
    I posted what I can. www.mysqltuner.com does not appear to be up at the moment.
    – bjk116
    May 20, 2020 at 18:07

2 Answers 2

1

Rate Per Second = RPS

Suggestions to consider for your my.ini [mysqld] section

innodb_lru_scan_depth=100  # from 1024 to conserve 90% of CPU cycles used for function
log_output=FILE  # from NONE someday you will need Slow Query Log and General Log's
tmp_table_size=16M  # from 4M to be same size as max_heap_table_size
slow_query_log=ON  # from OFF to record the 88 slow queries for corrective action
innodb_open_files=2000  # should always match table_open_cache requested
read_buffer_size=128K  # from 8K to reduce handler_read_next RPS of 3,115
query_cache_type=OFF  # from ON only 2% of queries are cached
query_cache_size=0  # from 1M to conserve RAM and CPU cycles

Observations, A) threads_connected count at 14 indicates connections are not being CLOSED when done confirmed with SHOW FULL PROCESS LIST B) select_full_join RPS of 13 indicates indexes missing when JOIN tables requested C) select_scan RPS of 1 indicates indexes missing on SELECT requests.

For additional assistance, use our free downloadable Utility Scripts and get in touch.

0

CPU spikes can be cured only by finding the slow queries and improving them.

Also, the "Query cache" is especially useless in your situation. Note that each INSERT triggers purging all entries in the QC that involve that table(s). Turn off the QC:

query_cache_type = 0
query_cache_size = 0

It appears that the dataset is very small -- much smaller than innodb_buffer_pool_size. (The only impact is that you are using more RAM than you need to. Cut the VM size in half if you are paying for it.)

If you have trouble finding the naughty queries, see http://mysql.rjweb.org/doc.php/mysql_analysis#slow_queries_and_slowlog . Use long_query_time = 0.5

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