sysbench对数据库进行压力测试

sysbench是一款压力测试工具，可以测试系统的硬件性能，也可以用来对数据库进行基准测试。

安装方式：https://github.com/akopytov/sysbench/blob/master/README.md#general-command-line-options

此处安装的是sysbench 1.0.6版本，和网上大部分的0.4，0.5版本的命令不太一样。

sysbench支持三种测试方案：

1、使用自带的测试模块，如对cpu,I/O,memory等的测试。

2、使用自带的lua脚本进行测试，如果使用快速安装的方式，默认的脚本路径为：/usr/share/sysbench

3、使用自定义的lua脚本。

获取帮助信息：

如果对相关模块或者脚本的参数不明确的，可以使用 sysbench  testname help来查看，testname含模块名称和脚本名称。

sysbench经典测试命令：

• prepare: 创建测试数据或者相关的测试文件，为测试做准备工作。如数据库的测试数据准备等。

• run: 开始执行测试。

• cleanup: 移除测试数据

• help: 帮助命令

测试CPU性能

sysbench cpu --cpu-max-prime=10000 run

#显示测试结果
General statistics:
    total time:                          10.0003s
    total number of events:              8692

Latency (ms):
         min:                                  1.12
         avg:                                  1.15
         max:                                  2.98
         95th percentile:                      1.25
         sum:                               9996.64

Threads fairness:
    events (avg/stddev):           8692.0000/0.00
    execution time (avg/stddev):   9.9966/0.00

I/O测试

准备测试数据：

sysbench fileio --file-total-size=40G prepare

运行顺序写入测试：

sysbench fileio --file-total-size=40G --file-test-mode=seqwr run

#测试结果
File operations:
    reads/s:                      0.00
    writes/s:                     3916.87
    fsyncs/s:                     5001.01

Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               61.20

General statistics:
    total time:                          10.0055s
    total number of events:              89250

Latency (ms):
         min:                                  0.01
         avg:                                  0.11
         max:                                 28.02
         95th percentile:                      0.12
         sum:                               9937.24

Threads fairness:
    events (avg/stddev):           89250.0000/0.00
    execution time (avg/stddev):   9.9372/0.00

运行顺序重写测试：

sysbench fileio --file-total-size=40G --file-test-mode=seqrewr run

#测试结果：

File operations:
    reads/s:                      0.00
    writes/s:                     4018.65
    fsyncs/s:                     5131.38
Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               62.79
General statistics:
    total time:                          10.0003s
    total number of events:              91531
Latency (ms):
         min:                                  0.00
         avg:                                  0.11
         max:                                 31.45
         95th percentile:                      0.10
         sum:                               9933.80
Threads fairness:
    events (avg/stddev):           91531.0000/0.00
    execution time (avg/stddev):   9.9338/0.00

混合随机读/写：（如果执行出错，需要重新prepare数据）

sysbench fileio --file-total-size=40G --file-test-mode=rndrw  --max-time=100 --max-requests=0 run
#测试结果：

File operations:
    reads/s:                      338.98
    writes/s:                     225.99
    fsyncs/s:                     722.23

Throughput:
    read, MiB/s:                  5.30
    written, MiB/s:               3.53

General statistics:
    total time:                          100.0007s
    total number of events:              128727

Latency (ms):
         min:                                  0.00
         avg:                                  0.78
         max:                                 43.01
         95th percentile:                      2.97
         sum:                              99785.92

Threads fairness:
    events (avg/stddev):           128727.0000/0.00
    execution time (avg/stddev):   99.7859/0.00

清除测试数据：

sysbench fileio --file-total-size=40G cleanup

OLTP基准测试

OLTP基准测试模拟了一个简单的事务处理系统的工作负载。若要对数据库性能进行测试就要使用OLTP相关的脚本。

在/usr/share/sysbench/目录下有相关的lua脚本：

bulk_insert.lua
oltp_common.lua
oltp_delete.lua
oltp_insert.lua
oltp_point_select.lua
oltp_read_only.lua
oltp_read_write.lua
oltp_update_index.lua
oltp_update_non_index.lua
oltp_write_only.lua
select_random_points.lua
select_random_ranges.lua

对于未知的测试参数，可以通过 sysbench  scripts-name help 来查看。

创建测试数据：

sysbench oltp_common  --table-size=1000000 --db-driver=mysql \
--mysql-db=test --mysql-user=root --mysql-password=123456  prepare


Creating table 'sbtest1'...
Inserting 1000000 records into 'sbtest1'
Creating a secondary index on 'sbtest1'...

执行run命令进行测试：（只读）

sysbench oltp_read_only  --table-size=1000000 --db-driver=mysql \
 --mysql-db=test --mysql-user=root --mysql-password=123456 --time=60  --max-requests=0 --threads=8 run
#测试结果
 
Running the test with following options:
Number of threads: 8
Initializing random number generator from current time
Initializing worker threads...
Threads started!
SQL statistics:
    queries performed:
        read:                            1679174
        write:                           0
        other:                           239882
        total:                           1919056
    transactions:                        119941 (1998.81 per sec.)
    queries:                             1919056 (31980.95 per sec.)
    ignored errors:                      0      (0.00 per sec.)
    reconnects:                          0      (0.00 per sec.)
General statistics:
    total time:                          60.0047s
    total number of events:              119941
Latency (ms):
         min:                                  0.32
         avg:                                  4.00
         max:                                 56.17
         95th percentile:                      8.13
         sum:                             479830.78
Threads fairness:
    events (avg/stddev):           14992.6250/116.75
    execution time (avg/stddev):   59.9788/0.00

除了使用read_only测试，我们还可以测试数据库的写性能：

sysbench oltp_write_only  --table-size=1000000 --db-driver=mysql \
 --mysql-db=test --mysql-user=root --mysql-password=123456 --time=60  --max-requests=0 --threads=8 run
#测试结果

SQL statistics:
    queries performed:
        read:                            0
        write:                           83764
        other:                           41882
        total:                           125646
    transactions:                        20941  (348.93 per sec.)
    queries:                             125646 (2093.56 per sec.)
    ignored errors:                      0      (0.00 per sec.)
    reconnects:                          0      (0.00 per sec.)
General statistics:
    total time:                          60.0120s
    total number of events:              20941
Latency (ms):
         min:                                  4.92
         avg:                                 22.92
         max:                               5518.27
         95th percentile:                     69.29
         sum:                             479968.99
Threads fairness:
    events (avg/stddev):           2617.6250/17.87
    execution time (avg/stddev):   59.9961/0.00

上面的结果中包含了很多的信息，其中重点需要我们关注的信息是：

1、总的事务数 （total number of events）

2、每秒事务数

3、时间统计信息（最小，平均，最大响应时间，以及95%百分比响应时间）

4、线程公平性统计信息，表示负载的公平性。（thread-fairness)

清理测试数据：

sysbench oltp_read_only  --table-size=1000000 --db-driver=mysql \
 --mysql-db=test --mysql-user=root --mysql-password=123456 cleanup