交付服务器或数据库的时候，我们需要对服务器和数据库的性能有一定的了解。可以使用sysbench对系统做一些压测。
sysbench
sysbench下载
https://github.com/akopytov/sysbench
可以使用0.5版本，支持lua插件压测数据库
sysbench 数据库压测lua脚本例子
https://github.com/percona/sysbench-scripts
Usage:
sysbench --test=<test-name> [options]... <command>
Commands: prepare run cleanup help version
General options:
--num-threads=N number of threads to use [1]
--max-requests=N limit for total number of requests [10000]
--max-time=N limit for total execution time in seconds [0]
--forced-shutdown=STRING amount of time to wait after --max-time before forcing shutdown [off]
--thread-stack-size=SIZE size of stack per thread [64K]
--tx-rate=N target transaction rate (tps) [0]
--report-interval=N periodically report intermediate statistics with a specified interval in seconds. 0 disables intermediate reports [0]
--report-checkpoints=[LIST,...]dump full statistics and reset all counters at specified points in time. The argument is a list of comma-separated values representing the amount of time in seconds elapsed from start of test when report checkpoint(s) must be performed. Report checkpoints are off by default. []
--test=STRING test to run
--debug=[on|off] print more debugging info [off]
--validate=[on|off] perform validation checks where possible [off]
--help=[on|off] print help and exit
--version=[on|off] print version and exit [off]
--rand-init=[on|off] initialize random number generator [off]
--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, ignored when 0 [0]
--rand-pareto-h=N parameter h for pareto distibution [0.2]
--config-file=FILENAME File containing command line options
Log options:
--verbosity=N verbosity level {5 - debug, 0 - only critical messages} [3]
--percentile=N percentile rank of query response times to count [95]
General database options:
--db-driver=STRING specifies database driver to use ('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:
mysql - MySQL driver
mysql options:
--mysql-host=[LIST,...] MySQL server host [localhost]
--mysql-port=N 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-table-engine=STRING storage engine to use for the test table {myisam,innodb,bdb,heap,ndbcluster,federated} [innodb]
--mysql-engine-trx=STRING whether storage engine used is transactional or not {yes,no,auto} [auto]
--mysql-ssl=[on|off] use SSL connections, if available in the client library [off]
--mysql-compression=[on|off] use compression, if available in the client library [off]
--myisam-max-rows=N max-rows parameter for MyISAM tables [1000000]
--mysql-debug=[on|off] dump 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, pretent that all MySQL client API calls are successful without executing them [off]
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
See 'sysbench --test=<name> help' for a list of options for each test.cpu
sysbench --test=cpu run
指定多个线程：
sysbench --test=cpu --num-threads=30 run
指定测试时间：
sysbench --test=cpu --max-time=10 run
指定测试请求数
sysbench --test=cpu --max-requests=100000 --num-threads=100 runio
$ sysbench --test=fileio help
sysbench 0.5: multi-threaded system evaluation benchmark
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=STRING additional flags to use on opening 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]
io测试中比较重要的几个参数：
file-test-mode： 读还是写？顺序访问还是随机访问？ 对于数据库，需要测试重点关注随机IO的性能。
file-fsync-freq： 测试fsync的性能。
file-rw-ratio：读写比例
io 测试
准备测试文件
mkdir test
cd test
sysbench --test=fileio --file-test-mode=rndrw prepare
dtstack@test01:~/test$ ls -lh
total 2.0G
-rw------- 1 dtstack dtstack 16M Jun 28 23:00 test_file.0
-rw------- 1 dtstack dtstack 16M Jun 28 23:00 test_file.1
-rw------- 1 dtstack dtstack 16M Jun 28 23:00 test_file.10
-rw------- 1 dtstack dtstack 16M Jun 28 23:00 test_file.100
-rw------- 1 dtstack dtstack 16M Jun 28 23:00 test_file.101
运行压测, 随机读写
sysbench --test=fileio --file-test-mode=rndrw --max-requests=100000 --num-threads=16 run压测运行过程中，注意观察io性能。比如我们的这个测试机器，写入iops 500左右，写数据吞度量8M／s， 响应时间近30ms，性能比较一般。
iostat -kx 3
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.33 115.00 5.33 488.00 114.67 7934.67 32.63 13.67 27.76 14.00 27.91 2.03 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
9.62 0.17 3.12 54.37 0.00 32.73
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 121.00 5.00 474.00 128.00 7732.00 32.82 14.15 29.00 6.40 29.24 2.09 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
8.98 0.17 2.12 62.49 0.00 26.25
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 2.33 118.00 3.67 488.67 106.67 7909.33 32.56 14.56 30.03 17.09 30.12 2.03 100.00
测试内存分配和访问
dtstack@test01:~/test$ sysbench --test=memory help
sysbench 0.5: multi-threaded system evaluation benchmark
memory options:
--memory-block-size=SIZE size of memory block for test [1K]
--memory-total-size=SIZE total size of data to transfer [100G]
--memory-scope=STRING memory access scope {global,local} [global]
--memory-hugetlb=[on|off] allocate memory from HugeTLB pool [off]
--memory-oper=STRING type of memory operations {read, write, none} [write]
--memory-access-mode=STRING memory access mode {seq,rnd} [seq]
dtstack@test01:~/test$ sysbench --test=memory --num-threads=64 run
sysbench 0.5: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 64
Random number generator seed is 0 and will be ignored
Initializing worker threads...
Threads started!
Operations performed: 104857600 (890624.94 ops/sec)
102400.00 MB transferred (869.75 MB/sec)MySQL压测
sysbench 0.5 使用lua插件的形式压测数据库。
--test 参数指定lua脚本，lua脚本的内容参考下面的例子，
或者参考
dtstack@test01:~/junda/sysbench-scripts/timeseries$ sysbench --test=insertv1.lua --mysql-host=127.0.0.1 --mysql-user=root --mysql-password=xx --max-requests=1000 prepare
sysbench 0.5: multi-threaded system evaluation benchmark
Creating table 'sensordata' ...
dtstack@test01:~/junda/sysbench-scripts/timeseries$ sysbench --test=insertv1.lua --mysql-host=127.0.0.1 --mysql-user=root --mysql-password=xx --max-requests=1000 run
sysbench 0.5: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 1
Random number generator seed is 0 and will be ignored
Initializing worker threads...最简单的lua脚本，往一个表插入数据
$ cat test.lua
function event(thread_id)
db_query("insert into t1(a ) values(100)")
end$ cat create.lua
function event(thread_id)
for i = 1,10 do
db_query("create table t" .. i .. "(a int)")
end
end
$ cat drop.lua
function event(thread_id)
for i = 1,10 do
db_query("drop table if exists t" .. i )
end
end
