MySQL will use as high as 1300% CPU in top under load, which is I am guessing 1000+ requests/min. This causes the server and request times to slow to a crawl. When I perform a simple test with 5-10 threads using my software which executes one SELECT and UPDATE statement on the server, CPU runs up immediately to 50-60%. Memory usage is always very low. I have tried using mysqltuner.pl to no avail, optimizing tables etc. However I am almost certain these issues are due to poor configuration. I also use nginx/apache.
Server is CentOS 6.7, 4x (16 core) Xeon L5520 2.27GHz, 24GB memory
mysql Ver 14.14 Distrib 5.5.48, for Linux (x86_64) using readline 5.1
/etc/my.cnf is as follows (datadir and socket because I tried transferring to SSD yesterday to improve performance):
Original post won't let me edit in mysqltuner.pl data so here it is:
Server is CentOS 6.7, 4x (16 core) Xeon L5520 2.27GHz, 24GB memory
mysql Ver 14.14 Distrib 5.5.48, for Linux (x86_64) using readline 5.1
/etc/my.cnf is as follows (datadir and socket because I tried transferring to SSD yesterday to improve performance):
Code:
[mysqld]
default-storage-engine=MyISAM
innodb_file_per_table=1
max_allowed_packet=268435456
table_open_cache=25000
open_files_limit=50000
max_connections=1000
query_cache_size=134217728
thread_cache_size=128
tmp_table_size=536870912
max_heap_table_size=536870912
key_buffer_size=268435456
datadir=/mysql/mysql
socket=/mysql/mysql/mysql.sock
Code:
>> MySQLTuner 1.6.4 - Major Hayden <[email protected]>
>> Bug reports, feature requests, and downloads at http://mysqltuner.com/
>> Run with '--help' for additional options and output filtering
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.48-cll
[OK] Operating on 64-bit architecture
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MRG_MYISAM
[--] Data in MyISAM tables: 304M (Tables: 411)
[--] Data in InnoDB tables: 93M (Tables: 91)
[!!] Total fragmented tables: 48
-------- Security Recommendations -------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[--] There are 605 basic passwords in the list.
-------- CVE Security Recommendations ---------------------------------------
[--] Skipped due to --cvefile option undefined
-------- Performance Metrics -------------------------------------------------
[--] Up for: 34m 29s (58K q [28.294 qps], 6K conn, TX: 560M, RX: 7M)
[--] Reads / Writes: 42% / 58%
[--] Binary logging is disabled
[--] Total buffers: 1.0G global + 2.8M per thread (1000 max threads)
[OK] Maximum reached memory usage: 1.0G (4.47% of installed RAM)
[OK] Maximum possible memory usage: 3.7G (15.78% of installed RAM)
[OK] Slow queries: 0% (0/58K)
[OK] Highest usage of available connections: 1% (12/1000)
[OK] Aborted connections: 0.00% (0/6943)
[OK] Query cache efficiency: 85.1% (35K cached / 42K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 243 sorts)
[!!] Joins performed without indexes: 14
[!!] Temporary tables created on disk: 36% (47 on disk / 129 total)
[OK] Thread cache hit rate: 99% (12 created / 6K connections)
[OK] Table cache hit rate: 94% (110 open / 117 opened)
[OK] Open file limit used: 0% (154/51K)
[OK] Table locks acquired immediately: 99% (14K immediate / 14K locks)
-------- MyISAM Metrics ------------------------------------------------------
[!!] Key buffer used: 18.9% (50M used / 268M cache)
[OK] Key buffer size / total MyISAM indexes: 256.0M/56.1M
[!!] Read Key buffer hit rate: 94.4% (30K cached / 1K reads)
[!!] Write Key buffer hit rate: 46.0% (3K cached / 1K writes)
-------- InnoDB Metrics ------------------------------------------------------
[--] InnoDB is enabled.
[OK] InnoDB buffer pool / data size: 128.0M/93.9M
[OK] InnoDB buffer pool instances: 1
[!!] InnoDB Used buffer: 9.78% (801 used/ 8191 total)
[OK] InnoDB Read buffer efficiency: 100.00% (49599637 hits/ 49600366 total)
[!!] InnoDB Write buffer efficiency: 0.00% (0 hits/ 1 total)
[OK] InnoDB log waits: 0.00% (0 waits / 8183 writes)
-------- ThreadPool Metrics --------------------------------------------------
[--] ThreadPool stat is disabled.
-------- AriaDB Metrics ------------------------------------------------------
[--] AriaDB is disabled.
-------- TokuDB Metrics ------------------------------------------------------
[--] TokuDB is disabled.
-------- Galera Metrics ------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -------------------------------------------------
[--] No replication slave(s) for this server.
[--] This is a standalone server..
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
MySQL started within last 24 hours - recommendations may be inaccurate
Enable the slow query log to troubleshoot bad queries
Adjust your join queries to always utilize indexes
Temporary table size is already large - reduce result set size
Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
join_buffer_size (> 128.0K, or always use indexes with joins)
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