Большая нагрузка на сервер

День добрый.

Никак не могу победить нагрузку. Нагрузку тестирую siege'ом:

siege -c 350 -t30s http://сайт/

Загружает сильно apache2 и mysql. 100% загрузка проца. Статика отдается nginx'ом - все хорошо.

Оперативка максимум используется 5Гб из 64Гб

в логах apache2 и nginx ничего по ошибкам нет, а вот по mysql:

mysql error.log:

161002 14:46:24 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. $

161002 14:46:24 [Note] Plugin 'FEDERATED' is disabled.

161002 14:46:24 InnoDB: The InnoDB memory heap is disabled

161002 14:46:24 InnoDB: Mutexes and rw_locks use GCC atomic builtins

161002 14:46:24 InnoDB: Compressed tables use zlib 1.2.8

161002 14:46:24 InnoDB: Using Linux native AIO

161002 14:46:24 InnoDB: Initializing buffer pool, size = 128.0M

161002 14:46:24 InnoDB: Completed initialization of buffer pool

161002 14:46:24 InnoDB: highest supported file format is Barracuda.

161002 14:46:24  InnoDB: Waiting for the background threads to start

161002 14:46:25 InnoDB: 5.5.52 started; log sequence number 88439312

161002 14:46:25 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306

161002 14:46:25 [Note]   - '127.0.0.1' resolves to '127.0.0.1';

161002 14:46:25 [Note] Server socket created on IP: '127.0.0.1'.

161002 14:46:25 [Note] Event Scheduler: Loaded 0 events

161002 14:46:25 [Note] /usr/sbin/mysqld: ready for connections.

Version: '5.5.52-0ubuntu0.14.04.1-log'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu)

mysqltuner.pl

[OK] NO SECURITY CVE FOUND FOR YOUR VERSION



-------- Performance Metrics -----------------------------------------------------------------------

[--] Up for: 21m 56s (454 q [0.345 qps], 154 conn, TX: 67K, RX: 31K)

[--] Reads / Writes: 100% / 0%

[--] Binary logging is disabled

[--] Physical Memory     : 62.9G

[--] Max MySQL memory    : 998.2M

[--] Other process memory: 229.9M

[--] Total buffers: 192.0M global + 2.7M per thread (300 max threads)

[--] P_S Max memory usage: 0B

[--] Galera GCache Max memory usage: 0B

[OK] Maximum reached memory usage: 194.7M (0.30% of installed RAM)

[OK] Maximum possible memory usage: 998.2M (1.55% of installed RAM)

[OK] Overall possible memory usage with other process is compatible with memory available

[OK] Slow queries: 0% (0/454)

[OK] Highest usage of available connections: 0% (1/300)

[OK] Aborted connections: 0.00%  (0/154)

[!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance

[!!] Query cache may be disabled by default due to mutex contention.

[OK] No Sort requiring temporary tables

[OK] No joins without indexes

[OK] Temporary tables created on disk: 25% (54 on disk / 215 total)

[OK] Table cache hit rate: 95% (153 open / 160 opened)

[OK] Open file limit used: 18% (274/1K)

[OK] Table locks acquired immediately: 100% (174 immediate / 174 locks)



-------- Performance schema ------------------------------------------------------------------------

[--] Performance schema is disabled.



-------- ThreadPool Metrics ------------------------------------------------------------------------

[--] ThreadPool stat is disabled.



-------- MyISAM Metrics ----------------------------------------------------------------------------

[!!] Key buffer used: 18.2% (3M used / 16M cache)

[!!] Key buffer size / total MyISAM indexes: 16.0M/31.0M



-------- AriaDB Metrics ----------------------------------------------------------------------------

[--] AriaDB is disabled.

-------- InnoDB Metrics ----------------------------------------------------------------------------

[--] InnoDB is disabled.

[!!] InnoDB Storage engine is disabled. InnoDB is the default storage engine



-------- 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:

    Add skip-innodb to MySQL configuration to disable InnoDB

    1 user(s) used basic or weak password.

    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

Variables to adjust:

    query_cache_type (=0)

    key_buffer_size (> 31.0M)

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