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[root@mysql ~]# vim /etc/my.cnf ................[mysqld]max_connections=1024[root@mysql ~]# systemctl restart mysqld

#查看最大连接数mysql> show variables like 'max_connections'; +-----------------+-------+| Variable_name | Value |+-----------------+-------+| max_connections | 1024 |+-----------------+-------+1 row in set (0.00 sec)

[root@mysql ~]# mysqlslap --defaults-file=/etc/my.cnf --concurrency=100,200 --iterations=1 --number-int-cols=20 --number-char-cols=30 --auto-generate-sql --auto-generate-sql-add-autoincrement --auto-generate-sql-load-type=mixed --engine=myisam,innodb --number-of-queries=2000 -uroot -p123 --verbose

[root@mysql ~]# yum -y install epel-release #安装第三方epel源[root@mysql ~]# yum -y install sysbench #安装sysbench工具[root@mysql ~]# sysbench --version #确定工具已安装sysbench 1.0.17

sysbench 可以进行以下测试：
1. CPU 运算性能测试2. 磁盘 IO 性能测试3. 调度程序性能测试4. 内存分配及传输速度测试5. POSIX 线程性能测试6. 数据库性能测试（OLTP 基准测试，需要通过 /usr/share/sysbench/ 目录中的 Lua 脚本执行，例如 oltp_read_only.lua 脚本执行只读测试）7. sysbench 还可以通过运行命令时指定自己的 Lua 脚本来自定义测试。

[root@mysql ~]# sysbench --helpUsage: sysbench [options]... [testname] [command]
Commands implemented by most tests: prepare run cleanup help # 可用的命令，四个
General options: # 通用选项 --threads=N 要使用的线程数，默认 1 个 [1] --events=N 最大允许的事件个数 [0] --time=N 最大的总执行时间，以秒为单位 [10] --forced-shutdown=STRING 在 --time 时间限制到达后，强制关闭之前等待的秒数，默认“off”禁用（number of seconds to wait after the --time limit before forcing shutdown, or 'off' to disable） [off] --thread-stack-size=SIZE 每个线程的堆栈大小 [64K] --rate=N 平均传输速率。0 则无限制 [0] --report-interval=N 以秒为单位定期报告具有指定间隔的中间统计信息 0 禁用中间报告 [0] --report-checkpoints=[LIST,...] 转储完整的统计信息并在指定的时间点重置所有计数器。参数是一个逗号分隔的值列表，表示从测试开始经过这个时间量时必须执行报告检查点（以秒为单位）。报告检查点默认关闭。 [] --debug[=on|off] 打印更多 debug 信息 [off] --validate[=on|off] 尽可能执行验证检查 [off] --help[=on|off] 显示帮助信息并退出 [off] --version[=on|off] 显示版本信息并退出 [off] --config-file=FILENAME 包含命令行选项的文件 --tx-rate=N 废弃，改用 --rate [0] --max-requests=N 废弃，改用 --events [0] --max-time=N 废弃，改用 --time [0] --num-threads=N 废弃，改用 --threads [1]
Pseudo-Random Numbers Generator options: # 伪随机数发生器选项 --rand-type=STRING random numbers distribution {uniform,gaussian,special,pareto} [special] --rand-spec-iter=N number of iterations used for numbers generation [12] --rand-spec-pct=N percentage of values to be treated as 'special' (for special distribution) [1] --rand-spec-res=N percentage of 'special' values to use (for special distribution) [75] --rand-seed=N seed for random number generator. When 0, the current time is used as a RNG seed. [0] --rand-pareto-h=N parameter h for pareto distribution [0.2]
Log options: # 日志选项 --verbosity=N verbosity level {5 - debug, 0 - only critical messages} [3]
 --percentile=N percentile to calculate in latency statistics (1-100). Use the special value of 0 to disable percentile calculations [95] --histogram[=on|off] print latency histogram in report [off]
General database options: # 通用的数据库选项
 --db-driver=STRING 指定要使用的数据库驱动程序 ('help' to get list of available drivers) --db-ps-mode=STRING prepared statements usage mode {auto, disable} [auto] --db-debug[=on|off] print database-specific debug information [off]
Compiled-in database drivers: # 內建的数据库驱动程序，默认支持 MySQL 和 PostgreSQL mysql - MySQL driver pgsql - PostgreSQL driver
mysql options: # MySQL 数据库专用选项 --mysql-host=[LIST,...] MySQL server host [localhost] --mysql-port=[LIST,...] MySQL server port [3306] --mysql-socket=[LIST,...] MySQL socket --mysql-user=STRING MySQL user [sbtest] --mysql-password=STRING MySQL password [] --mysql-db=STRING MySQL database name [sbtest] --mysql-ssl[=on|off] use SSL connections, if available in the client library [off] --mysql-ssl-cipher=STRING use specific cipher for SSL connections [] --mysql-compression[=on|off] use compression, if available in the client library [off] --mysql-debug[=on|off] trace all client library calls [off] --mysql-ignore-errors=[LIST,...] list of errors to ignore, or "all" [1213,1020,1205] --mysql-dry-run[=on|off] Dry run, pretend that all MySQL client API calls are successful without executing them [off]
pgsql options: # PostgreSQL 数据库专用选项 --pgsql-host=STRING PostgreSQL server host [localhost] --pgsql-port=N PostgreSQL server port [5432] --pgsql-user=STRING PostgreSQL user [sbtest] --pgsql-password=STRING PostgreSQL password [] --pgsql-db=STRING PostgreSQL database name [sbtest]
Compiled-in tests: # 內建测试类型 fileio - File I/O test cpu - CPU performance test memory - Memory functions speed test threads - Threads subsystem performance test mutex - Mutex performance test
See 'sysbench <testname> help' for a list of options for each test.

#查看sysbench自带的lua脚本使用方法[root@mysql ~]# sysbench /usr/share/sysbench/oltp_common.lua help#必须创建sbtest库，sbtest事sysbench默认使用的库名[root@mysql ~]# mysqladmin -uroot -p123 create sbtest;#然后，准备测试所用的表，这些测试表放在测试库sbtest中。这里使用的lua脚本为/usr/share/sysbench/oltp_common.lua[root@mysql ~]# sysbench --mysql-host=127.0.0.1 \--mysql-port=3306 \--mysql-user=root \--mysql-password=123 \/usr/share/sysbench/oltp_common.lua \--tables=10 \--table_size=100000 \prepare#其中--tables=10表示创建10个测试表，#--table_size=100000表示每个表中插入10W行数据，#prepare表示这是准备数的过程。

[root@mysql ~]# mysql -uroot -p123 sbtest; #登录到sbtest库mysql> show tables; #查看相应的表+------------------+| Tables_in_sbtest |+------------------+| sbtest1 || sbtest10 || sbtest2 || sbtest3 || sbtest4 || sbtest5 || sbtest6 || sbtest7 || sbtest8 || sbtest9 |+------------------+10 rows in set (0.00 sec)
mysql> select count(*) from sbtest1; #随机选择一个表，确认其有100000条数据+----------+| count(*) |+----------+| 100000 |+----------+1 row in set (0.01 sec)

#执行测试命令如下：[root@mysql ~]# sysbench --threads=4 \--time=20 \ --report-interval=5 \ --mysql-host=127.0.0.1 \--mysql-port=3306 \--mysql-user=root \--mysql-password=123 \/usr/share/sysbench/oltp_read_write.lua \--tables=10 \ --table_size=100000 \run

[root@mysql ~]# sysbench --threads=4 --time=20 --report-interval=5 --mysql-host=127.0.0.1 --mysql-port=3306 --mysql-user=root --mysql-password=123 /usr/share/sysbench/oltp_read_write.lua --tables=10 --table_size=100000 run
sysbench 1.0.17 (using system LuaJIT 2.0.4)
Running the test with following options:Number of threads: 4Report intermediate results every 5 second(s)Initializing random number generator from current time
Initializing worker threads...
Threads started!#以下是每5秒返回一次的结果，统计的指标包括：# 线程数、tps(每秒事务数)、qps(每秒查询数)、# 每秒的读/写/其它次数、延迟、每秒错误数、每秒重连次数[ 5s ] thds: 4 tps: 1040.21 qps: 20815.65 (r/w/o: 14573.17/4161.25/2081.22) lat (ms,95%): 7.17 err/s: 0.00 reconn/s: 0.00[ 10s ] thds: 4 tps: 1083.34 qps: 21667.15 (r/w/o: 15165.93/4334.55/2166.68) lat (ms,95%): 6.55 err/s: 0.00 reconn/s: 0.00[ 15s ] thds: 4 tps: 1121.57 qps: 22429.09 (r/w/o: 15700.64/4485.30/2243.15) lat (ms,95%): 6.55 err/s: 0.00 reconn/s: 0.00[ 20s ] thds: 4 tps: 1141.69 qps: 22831.98 (r/w/o: 15982.65/4566.16/2283.18) lat (ms,95%): 6.09 err/s: 0.00 reconn/s: 0.00SQL statistics: queries performed: read: 307146 # 执行的读操作数量 write: 87756 # 执行的写操作数量 other: 43878 # 执行的其它操作数量 total: 438780 transactions: 21939 (1096.57 per sec.) # 执行事务的平均速率 queries: 438780 (21931.37 per sec.) # 平均每秒能执行多少次查询 ignored errors: 0 (0.00 per sec.) reconnects: 0 (0.00 per sec.)
General statistics: total time: 20.0055s # 总消耗时间 total number of events: 21939 # 总请求数量(读、写、其它)
Latency (ms): min: 1.39 avg: 3.64 max: 192.05 95th percentile: 6.67 # 采样计算的平均延迟 sum: 79964.26
Threads fairness: events (avg/stddev): 5484.7500/15.12 execution time (avg/stddev): 19.9911/0.00

[root@mysql ~]# sysbench --help .......... # 省略部分内容Compiled-in tests: fileio - File I/O test cpu - CPU performance test memory - Memory functions speed test threads - Threads subsystem performance test mutex - Mutex performance test

[root@mysql ~]# sysbench fileio helpsysbench 1.0.17 (using system LuaJIT 2.0.4)
fileio options: --file-num=N number of files to create [128] --file-block-size=N block size to use in all IO operations [16384] --file-total-size=SIZE total size of files to create [2G] --file-test-mode=STRING test mode {seqwr, seqrewr, seqrd, rndrd, rndwr, rndrw} --file-io-mode=STRING file operations mode {sync,async,mmap} [sync] --file-async-backlog=N number of asynchronous operatons to queue per thread [128] --file-extra-flags=[LIST,...] list of additional flags to use to open files {sync,dsync,direct} [] --file-fsync-freq=N do fsync() after this number of requests (0 - don't use fsync()) [100] --file-fsync-all[=on|off] do fsync() after each write operation [off] --file-fsync-end[=on|off] do fsync() at the end of test [on] --file-fsync-mode=STRING which method to use for synchronization {fsync, fdatasync} [fsync] --file-merged-requests=N merge at most this number of IO requests if possible (0 - don't merge) [0] --file-rw-ratio=N reads/writes ratio for combined test [1.5]

[root@mysql ~]# sysbench fileio --file-num=5 --file-total-size=2G prepare[root@mysql ~]# ll -lh test*-rw------- 1 root root 410M May 26 16:05 test_file.0-rw------- 1 root root 410M May 26 16:05 test_file.1-rw------- 1 root root 410M May 26 16:05 test_file.2-rw------- 1 root root 410M May 26 16:05 test_file.3-rw------- 1 root root 410M May 26 16:05 test_file.4

[root@mysql ~]# sysbench --events=5000 \--threads=16 \fileio \--file-num=5 \--file-total-size=2G \--file-test-mode=rndrw \--file-fsync-freq=0 \--file-block-size=16384 \run

Running the test with following options:Number of threads: 16Initializing random number generator from current time
Extra file open flags: (none)5 files, 409.6MiB each2GiB total file sizeBlock size 16KiBNumber of IO requests: 5000Read/Write ratio for combined random IO test: 1.50Calling fsync() at the end of test, Enabled.Using synchronous I/O modeDoing random r/w testInitializing worker threads...
Threads started!
File operations: reads/s: 9899.03 writes/s: 6621.38 fsyncs/s: 264.33
Throughput: # 吞吐量 read, MiB/s: 154.66 #表示读带宽 written, MiB/s: 103.46 #表示写的带宽
General statistics: total time: 0.3014s total number of events: 5000
Latency (ms): min: 0.00 avg: 0.81 max: 53.56 95th percentile: 4.10 sum: 4030.48
Threads fairness: events (avg/stddev): 312.5000/27.64 execution time (avg/stddev): 0.2519/0.02

[root@mysql ~]# sysbench cpu --threads=40 --events=10000 --cpu-max-prime=20000 run