Wordpress + php + mysql 高 cpu 使用率
Wordpress + php + mysql High cpu usage
我正在使用 wordpress、php 7.2 和 [= 对生产服务器进行负载测试54=] Ver 15.1 Distrib 10.1.44-MariaDB，在 ubuntu 18.04 LTS 上配备 4 个 Core i7 CPUs 和 10GB Ram 运行 .问题是即使在低负载下，比如每秒 5 个用户，所有 4 CPUs 都飙升到 100%，并且它们仍然存在。一段时间后 CPU 已满，我只收到错误 500。此外，我所有的模块都是最新的。
我尝试禁用 wordpress 中的所有插件和 运行 同样的测试，但问题仍然存在。
我也使用了一些插件来优化数据库，比如 wp-optimize，但没有成功。 /var/log/mysql/mysql-slow.log 文件也是空的。
Result of load testing after only few sec including htop
Datadog's monitoring dashboard of the related test
如上图所示，您可以理解 mysqld 无缘无故地使用了太多 CPU。
我也运行mysql调谐器结果是这样的：
>> MySQLTuner 1.7.19 - Major Hayden <major@mhtx.net>
>> 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] Logged in using credentials passed on the command line
[OK] Currently running supported MySQL version 10.1.44-MariaDB-0ubuntu0.18.04.1
[OK] Operating on 64-bit architecture
-------- Log file Recommendations ------------------------------------------------------------------
[OK] Log file /var/log/mysql/error.log exists
[--] Log file: /var/log/mysql/error.log(7K)
[OK] Log file /var/log/mysql/error.log is readable.
[OK] Log file /var/log/mysql/error.log is not empty
[OK] Log file /var/log/mysql/error.log is smaller than 32 Mb
[!!] /var/log/mysql/error.log contains 8 warning(s).
[!!] /var/log/mysql/error.log contains 3 error(s).
[--] 3 start(s) detected in /var/log/mysql/error.log
[--] 1) 2020-05-09 12:36:17 139638727916672 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2) 2020-05-09 12:28:42 140719406492800 [Note] /usr/sbin/mysqld: ready for connections.
[--] 3) 2020-05-09 10:52:43 139784491093120 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2 shutdown(s) detected in /var/log/mysql/error.log
[--] 1) 2020-05-09 12:32:02 140713171822336 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 2) 2020-05-09 10:53:00 139784442357504 [Note] /usr/sbin/mysqld: Shutdown complete
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in InnoDB tables: 112.0K (Tables: 4)
[--] Data in MyISAM tables: 38.7M (Tables: 52)
[OK] Total fragmented tables: 0
-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.
-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] There is no basic password file list!
-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 48m 13s (73K q [25.317 qps], 1K conn, TX: 978M, RX: 11M)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory : 9.8G
[--] Max MySQL memory : 10.6G
[--] Other process memory: 0B
[--] Total buffers: 4.7G global + 6.9M per thread (800 max threads)
[--] P_S Max memory usage: 511M
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 6.5G (67.07% of installed RAM)
[!!] Maximum possible memory usage: 10.6G (108.28% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (0/73K)
[OK] Highest usage of available connections: 25% (204/800)
[!!] Aborted connections: 10.65% (193/1812)
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 12K sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 83% (2K on disk / 3K total)
[OK] Thread cache hit rate: 84% (284 created / 1K connections)
[OK] Table cache hit rate: 97% (222 open / 228 opened)
[OK] table_definition_cache(400) is upper than number of tables(303)
[OK] Open file limit used: 6% (304/4K)
[!!] Table locks acquired immediately: 84%
-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 511.6M
[--] Sys schema is installed.
-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 4 thread(s).
[--] Using default value is good enough for your version (10.1.44-MariaDB-0ubuntu0.18.04.1)
-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.4% (24M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/10.0M
[OK] Read Key buffer hit rate: 100.0% (695K cached / 152 reads)
[OK] Write Key buffer hit rate: 100.0% (18 cached / 18 writes)
-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 3.9G/112.0K
[OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 500.0M * 2/3.9G should be equal to 25%
[OK] InnoDB buffer pool instances: 3
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[!!] InnoDB Read buffer efficiency: 85.36% (1493 hits/ 1749 total)
[!!] InnoDB Write Log efficiency: 0% (1 hits/ 0 total)
[OK] InnoDB log waits: 0.00% (0 waits / 1 writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[!!] Aria pagecache hit rate: 89.4% (26K cached / 2K reads)
-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.
-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.
-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] Binlog format: STATEMENT
[--] XA support enabled: ON
[--] Semi synchronous replication Master: Not Activated
[--] Semi synchronous replication Slave: Not Activated
[--] This is a standalone server
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Control warning line(s) into /var/log/mysql/error.log file
Control error line(s) into /var/log/mysql/error.log file
MySQL was started within the last 24 hours - recommendations may be inaccurate
Reduce your overall MySQL memory footprint for system stability
Dedicate this server to your database for highest performance.
Reduce or eliminate unclosed connections and network issues
Temporary table size is already large - reduce result set size
Reduce your SELECT DISTINCT queries without LIMIT clauses
Optimize queries and/or use InnoDB to reduce lock wait
mysql 配置 /etc/mysqld/my.cnf:
[mysqld]
general_log = on
skip-name-resolve
innodb_read_io_threads=4
innodb_write_io_threads=4
general_log_file = /var/log/mysql/mysql.log
log_error=/var/log/mysql/mysql_error.log
#
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
innodb_buffer_pool_size= 4000M
max_connections =800
wait_timeout=100
interactive_timeout=100
query_cache_size=0
query_cache_type=0
query_cache_limit=2M
tmp_table_size=500M
max_heap_table_size=500M
thread_cache_size=4
performance_schema=ON
innodb_log_file_size=500M
innodb_buffer_pool_instances=3
innodb_autoinc_lock_mode = 2
/var/log/mysql/error.log
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: The InnoDB memory heap is disabled
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using Linux native AIO
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using SSE crc32 instructions
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Initializing buffer pool, size = 3.9G
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Completed initialization of buffer pool
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Highest supported file format is Barracuda.
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: 128 rollback segment(s) are active.
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: Waiting for purge to start
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.46-86.2 started; log sequence number 1832982
2020-05-09 12:36:17 139632989665024 [Note] InnoDB: Dumping buffer pool(s) not yet started
2020-05-09 12:36:17 139638727916672 [Note] Plugin 'FEEDBACK' is disabled.
2020-05-09 12:36:17 139638727916672 [Note] Server socket created on IP: '::'.
2020-05-09 12:36:17 139638727916672 [Warning] 'user' entry 'wp_user@server' ignored in --skip-name-resolve mode.
2020-05-09 12:36:17 139638727916672 [Warning] 'db' entry 'db_name wp_user@server' ignored in --skip-name-resolve mode.
2020-05-09 12:36:17 139638727916672 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.44-MariaDB-0ubuntu0.18.04.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 Ubuntu 18.04
每秒速率 = RPS
关于 my.cnf [mysqld] 部分的建议：
thread_cache_size=256 # from 4 for default minimum
innodb_io_capacity=900 # from 200 to enable higher IOPS
read_rnd_buffer_size=128K # from 256K to reduce handler_read_rnd_next RPS of 256
read_buffer_size=256K # from 128K to reduce handler_read_next RPS of 828
这些更改将减少 CPU 服务器的繁忙程度。有更多机会可以改善您的 my.cnf.
观察：
OS swap space 为 0. 6GB 对于您的 10GB 服务器来说是合理的并且可以避免内存不足。
Select_scan 可以通过适当的表格索引减少 1546 的 RPhr。
在我们的常见问题解答页面的 www.mysqlservertuning.com，我们提供了一些提示
问：如何找到不使用索引的 JOINS 或 QUERIES？
通过使用索引缩短响应时间并减少 CPU 繁忙百分比。
我正在使用 wordpress、php 7.2 和 [= 对生产服务器进行负载测试54=] Ver 15.1 Distrib 10.1.44-MariaDB，在 ubuntu 18.04 LTS 上配备 4 个 Core i7 CPUs 和 10GB Ram 运行 .问题是即使在低负载下，比如每秒 5 个用户，所有 4 CPUs 都飙升到 100%，并且它们仍然存在。一段时间后 CPU 已满，我只收到错误 500。此外，我所有的模块都是最新的。
我尝试禁用 wordpress 中的所有插件和 运行 同样的测试，但问题仍然存在。
我也使用了一些插件来优化数据库，比如 wp-optimize，但没有成功。 /var/log/mysql/mysql-slow.log 文件也是空的。
Result of load testing after only few sec including htop
Datadog's monitoring dashboard of the related test
如上图所示，您可以理解 mysqld 无缘无故地使用了太多 CPU。
我也运行mysql调谐器结果是这样的：
>> MySQLTuner 1.7.19 - Major Hayden <major@mhtx.net>
>> 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] Logged in using credentials passed on the command line
[OK] Currently running supported MySQL version 10.1.44-MariaDB-0ubuntu0.18.04.1
[OK] Operating on 64-bit architecture
-------- Log file Recommendations ------------------------------------------------------------------
[OK] Log file /var/log/mysql/error.log exists
[--] Log file: /var/log/mysql/error.log(7K)
[OK] Log file /var/log/mysql/error.log is readable.
[OK] Log file /var/log/mysql/error.log is not empty
[OK] Log file /var/log/mysql/error.log is smaller than 32 Mb
[!!] /var/log/mysql/error.log contains 8 warning(s).
[!!] /var/log/mysql/error.log contains 3 error(s).
[--] 3 start(s) detected in /var/log/mysql/error.log
[--] 1) 2020-05-09 12:36:17 139638727916672 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2) 2020-05-09 12:28:42 140719406492800 [Note] /usr/sbin/mysqld: ready for connections.
[--] 3) 2020-05-09 10:52:43 139784491093120 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2 shutdown(s) detected in /var/log/mysql/error.log
[--] 1) 2020-05-09 12:32:02 140713171822336 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 2) 2020-05-09 10:53:00 139784442357504 [Note] /usr/sbin/mysqld: Shutdown complete
-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in InnoDB tables: 112.0K (Tables: 4)
[--] Data in MyISAM tables: 38.7M (Tables: 52)
[OK] Total fragmented tables: 0
-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.
-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] There is no basic password file list!
-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined
-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 48m 13s (73K q [25.317 qps], 1K conn, TX: 978M, RX: 11M)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory : 9.8G
[--] Max MySQL memory : 10.6G
[--] Other process memory: 0B
[--] Total buffers: 4.7G global + 6.9M per thread (800 max threads)
[--] P_S Max memory usage: 511M
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 6.5G (67.07% of installed RAM)
[!!] Maximum possible memory usage: 10.6G (108.28% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (0/73K)
[OK] Highest usage of available connections: 25% (204/800)
[!!] Aborted connections: 10.65% (193/1812)
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 12K sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 83% (2K on disk / 3K total)
[OK] Thread cache hit rate: 84% (284 created / 1K connections)
[OK] Table cache hit rate: 97% (222 open / 228 opened)
[OK] table_definition_cache(400) is upper than number of tables(303)
[OK] Open file limit used: 6% (304/4K)
[!!] Table locks acquired immediately: 84%
-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 511.6M
[--] Sys schema is installed.
-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 4 thread(s).
[--] Using default value is good enough for your version (10.1.44-MariaDB-0ubuntu0.18.04.1)
-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.4% (24M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/10.0M
[OK] Read Key buffer hit rate: 100.0% (695K cached / 152 reads)
[OK] Write Key buffer hit rate: 100.0% (18 cached / 18 writes)
-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 3.9G/112.0K
[OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 500.0M * 2/3.9G should be equal to 25%
[OK] InnoDB buffer pool instances: 3
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[!!] InnoDB Read buffer efficiency: 85.36% (1493 hits/ 1749 total)
[!!] InnoDB Write Log efficiency: 0% (1 hits/ 0 total)
[OK] InnoDB log waits: 0.00% (0 waits / 1 writes)
-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[!!] Aria pagecache hit rate: 89.4% (26K cached / 2K reads)
-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.
-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.
-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.
-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] Binlog format: STATEMENT
[--] XA support enabled: ON
[--] Semi synchronous replication Master: Not Activated
[--] Semi synchronous replication Slave: Not Activated
[--] This is a standalone server
-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
Control warning line(s) into /var/log/mysql/error.log file
Control error line(s) into /var/log/mysql/error.log file
MySQL was started within the last 24 hours - recommendations may be inaccurate
Reduce your overall MySQL memory footprint for system stability
Dedicate this server to your database for highest performance.
Reduce or eliminate unclosed connections and network issues
Temporary table size is already large - reduce result set size
Reduce your SELECT DISTINCT queries without LIMIT clauses
Optimize queries and/or use InnoDB to reduce lock wait
mysql 配置 /etc/mysqld/my.cnf:
[mysqld]
general_log = on
skip-name-resolve
innodb_read_io_threads=4
innodb_write_io_threads=4
general_log_file = /var/log/mysql/mysql.log
log_error=/var/log/mysql/mysql_error.log
#
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
innodb_buffer_pool_size= 4000M
max_connections =800
wait_timeout=100
interactive_timeout=100
query_cache_size=0
query_cache_type=0
query_cache_limit=2M
tmp_table_size=500M
max_heap_table_size=500M
thread_cache_size=4
performance_schema=ON
innodb_log_file_size=500M
innodb_buffer_pool_instances=3
innodb_autoinc_lock_mode = 2
/var/log/mysql/error.log
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: The InnoDB memory heap is disabled
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using Linux native AIO
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Using SSE crc32 instructions
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Initializing buffer pool, size = 3.9G
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Completed initialization of buffer pool
2020-05-09 12:36:16 139638727916672 [Note] InnoDB: Highest supported file format is Barracuda.
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: 128 rollback segment(s) are active.
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: Waiting for purge to start
2020-05-09 12:36:17 139638727916672 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.46-86.2 started; log sequence number 1832982
2020-05-09 12:36:17 139632989665024 [Note] InnoDB: Dumping buffer pool(s) not yet started
2020-05-09 12:36:17 139638727916672 [Note] Plugin 'FEEDBACK' is disabled.
2020-05-09 12:36:17 139638727916672 [Note] Server socket created on IP: '::'.
2020-05-09 12:36:17 139638727916672 [Warning] 'user' entry 'wp_user@server' ignored in --skip-name-resolve mode.
2020-05-09 12:36:17 139638727916672 [Warning] 'db' entry 'db_name wp_user@server' ignored in --skip-name-resolve mode.
2020-05-09 12:36:17 139638727916672 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.44-MariaDB-0ubuntu0.18.04.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 Ubuntu 18.04
每秒速率 = RPS
关于 my.cnf [mysqld] 部分的建议：
thread_cache_size=256 # from 4 for default minimum
innodb_io_capacity=900 # from 200 to enable higher IOPS
read_rnd_buffer_size=128K # from 256K to reduce handler_read_rnd_next RPS of 256
read_buffer_size=256K # from 128K to reduce handler_read_next RPS of 828
这些更改将减少 CPU 服务器的繁忙程度。有更多机会可以改善您的 my.cnf.
观察： OS swap space 为 0. 6GB 对于您的 10GB 服务器来说是合理的并且可以避免内存不足。 Select_scan 可以通过适当的表格索引减少 1546 的 RPhr。 在我们的常见问题解答页面的 www.mysqlservertuning.com，我们提供了一些提示 问：如何找到不使用索引的 JOINS 或 QUERIES？ 通过使用索引缩短响应时间并减少 CPU 繁忙百分比。