[转帖]PostgreSQL 压测工具pgbench

1.命令

pgbench --help





 





pgbench is a benchmarking tool for PostgreSQL.





 





Usage:





  pgbench [OPTION]... [DBNAME]





 





Initialization options:





  -i, --initialize         invokes initialization mode 初始化模式





  -F, --fillfactor=NUM     set fill factor





  -n, --no-vacuum          do not run VACUUM after initialization





  -q, --quiet              quiet logging (one message each 5 seconds)





  -s, --scale=NUM          scaling factor





  --foreign-keys           create foreign key constraints between tables    





  --index-tablespace=TABLESPACE    





                           create indexes in the specified tablespace    





  --tablespace=TABLESPACE  create tables in the specified tablespace    





  --unlogged-tables        create tables as unlogged tables    





    





Options to select what to run:    





  -b, --builtin=NAME[@W]   add builtin script NAME weighted at W (default: 1)    





                           (use "-b list" to list available scripts)    





  -f, --file=FILENAME[@W]  add script FILENAME weighted at W (default: 1)  测试脚本位置（可以自定义）    





  -N, --skip-some-updates  skip updates of pgbench_tellers and pgbench_branches    





                           (same as "-b simple-update")    





  -S, --select-only        perform SELECT-only transactions    





                           (same as "-b select-only")    





    





Benchmarking options:    





  -c, --client=NUM         number of concurrent database clients (default: 1)  模拟客户端个数，相当于并发量





  -C, --connect            establish new connection for each transaction  设定为每一个事务建一个新连接   





  -D, --define=VARNAME=VALUE    





                           define variable for use by custom script    





  -j, --jobs=NUM           number of threads (default: 1)    启动线程数





  -l, --log                write transaction times to log file    





  -L, --latency-limit=NUM  count transactions lasting more than NUM ms as late    





  -M, --protocol=simple|extended|prepared    





                           protocol for submitting queries (default: simple)    





  -n, --no-vacuum          do not run VACUUM before tests    





  -P, --progress=NUM       show thread progress report every NUM seconds    每隔数秒显示线程进度报告





  -r, --report-latencies   report average latency per command    报告每个命令的平均延迟





  -R, --rate=NUM           target rate in transactions per second    





  -s, --scale=NUM          report this scale factor in output    





  -t, --transactions=NUM   number of transactions each client runs (default: 10)    





  -T, --time=NUM           duration of benchmark test in seconds   测试时间，单位：秒 





  -v, --vacuum-all         vacuum all four standard tables before tests    





  --aggregate-interval=NUM aggregate data over NUM seconds    





  --progress-timestamp     use Unix epoch timestamps for progress    





  --sampling-rate=NUM      fraction of transactions to log (e.g., 0.01 for 1%)    





 





Common options:





  -d, --debug              print debugging output    





  -h, --host=HOSTNAME      database server host or socket directory    





  -p, --port=PORT          database server port number    





  -U, --username=USERNAME  connect as specified database user    





  -V, --version            output version information, then exit





  -?, --help               show this help, then exit

 

2.初始化

su - postgres





 





# 使用postgres作为测试库





pgbench -i -d postgres





 





# 使用默认参数创造的测试表，各表的数据量：





pgbench_accounts：100000





pg_branches：1





pg_tellers：10

 

# 设置自定测试数据量，将测试数据扩大100倍,测试总数1000万，并且实时显示创建数据量

pgbench -i -F 100 -s 100 -d postgres

压测结果：

 

 

3.压力测试

（1）测试一个客户端session（用户）

# 时间20秒，显示每个命令的平均延迟

pgbench -c 1 -T 20 -r -d postgres

 

（2）测试30个客户端session（用户）

pgbench -c 30 -T 20 -r -d postgres

4.自定义脚本压力测试

# 创建测试表

create table test(id int primary key, info text, crt_time timestamp);

 

# 创建脚本

vi test.sql





\set id random(1,100000000)





insert into test (id,info,crt_time) values (:id, md5(random()::text), now()) on conflict (id) do update set info=excluded.info, crt_time=excluded.crt_time;

 

# 压力测试

pgbench -M prepared -r  -f ./test.sql -c 32 -j 32 -T 20 -d postgres

 

  

 

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