I have a small website hosted on a dedicated server (FreeBSD 9.2, MySQL 5.6.1 and php 5.5.5). The problem is that MySQL eats a lot of cpu resources even if the website have a few visitors. The database is small (the biggest table is about ~12k rows)
I have enabled slow queries log in my.conf but there are no logged queries.
Error log file does not contain any useful information (actually it's empty)
Here are the server specs
hw.machine: amd64 hw.model: Intel(R) Xeon(R) CPU X3330 @ 2.66GHz hw.ncpu: 4 hw.machine_arch: amd64
HHD transfer info
Seek times: Full stroke: 250 iter in 1.507837 sec = 6.031 msec Half stroke: 250 iter in 1.461401 sec = 5.846 msec Quarter stroke: 500 iter in 5.829283 sec = 11.659 msec Short forward: 400 iter in 2.668680 sec = 6.672 msec Short backward: 400 iter in 3.261849 sec = 8.155 msec Seq outer: 2048 iter in 0.247219 sec = 0.121 msec Seq inner: 2048 iter in 0.246036 sec = 0.120 msec Transfer rates: outside: 102400 kbytes in 1.207812 sec = 84781 kbytes/sec middle: 102400 kbytes in 1.342168 sec = 76294 kbytes/sec inside: 102400 kbytes in 1.893578 sec = 54078 kbytes/sec I/O command overhead: time to read 10MB block 0.131751 sec = 0.006 msec/sector time to read 20480 sectors 2.170542 sec = 0.106 msec/sector calculated command overhead = 0.100 msec/sector
top (at the moments where the load is high)
Mem: 1518M Active, 1396M Inact, 732M Wired, 50M Cache, 435M Buf, 239M Free 4949 mysql 27 52 0 2236M 1434M uwait 3 180:02 66.26% mysqld
[mysqld] sql_mode=NO_ENGINE_SUBSTITUTION skip-external-locking max_connections=5000 max_connect_errors=1500 ft_min_word_len = 2 myisam_sort_buffer_size = 64M # Log slow queries slow_query_log = 1 slow_query_log_file = /var/log/slow-queries.log long_query_time = 1 key_buffer = 384M max_allowed_packet = 32M thread_stack = 128K thread_cache_size = 128 thread_concurrency = 16 wait_timeout = 2000 interactive_timeout = 10000 join_buffer_size = 1M sort_buffer_size = 2M read_buffer_size = 1M read_rnd_buffer_size = 2M query_cache_size = 268435456 query_cache_type=1 query_cache_limit=1048576
I have no idea what's wrong.