1、使用场景
寻找最大并发用户数 ，最大并发用户数有一个公式：c=nL/T.其中n为每天访问系统的用户数，L为在线用户从登陆到退出的时间，T为用户每天使用系统大概多长时间。将我们测试找到的最大用户数跟该公式计算出来的对比，就可判断系统性能是否满足条件了。
2、脚本
针对某个使用频率特别高的接口进行测试。如图：
（1）线程数：为并发数，每个线程会完全独立的运行测试计划，互不干扰。
（2）ramp-up period:用户设置启动所有线程所需要的时间，如果选择了10个线程，并且ramp-up period为100秒，那么jmeter将使用100秒是10个线程启动，每个线程将在前一个线程启动后10（100/10）秒后启动
（3）设置循环次数：设置线程组结束前每个线程循环的次数，如果次数设置为1，那么jmeter在计划停止前只执行一次，若勾选了永远，则会一直执行（若下面设置了持续时间，则循环执行持续的时间后停止）
（4）持续时间，控制测试执行的持续时间，若循环次数设置为1，执行该线程组的时间小于持续时间线程组也会停止。
注意：该线程组使用了事务控制器，其作用为当该线程组多个接口实现了一个用例，使用事务控制器会生成一个汇总的结果。
D:\software\apache-jmeter-3.3\bin>jmeter -n -t 拐点测试.jmx -l summary.jtl -e -o report
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/software/apache-jmeter-3.3/lib/log4j-slf4j-impl-2.8.2.jar!/org/slf4j/impl/StaticLoggerBinder.clas
SLF4J: Found binding in [jar:file:/D:/software/apache-jmeter-3.3/lib/ext/jmeter-plugins-dubbo-1.3.6-jar-with-dependencies.jar!/org/slf4
SLF4J: Found binding in [jar:file:/D:/software/apache-jmeter-3.3/lib/ext/jmeter-test.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Creating summariser <summary>
Created the tree successfully using 拐点测试.jmx
Starting the test @ Wed Jan 15 10:58:47 CST 2020 (1579057127796)
Waiting for possible Shutdown/StopTestNow/Heapdump message on port 4445
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summary = 18035 in 00:00:42 = 430.8/s Avg: 17 Min: 8 Max: 94 Err: 0 (0.00%)
summary + 15647 in 00:00:30 = 521.5/s Avg: 18 Min: 11 Max: 53 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 33682 in 00:01:12 = 468.7/s Avg: 18 Min: 8 Max: 94 Err: 0 (0.00%)
summary + 16791 in 00:00:30 = 559.7/s Avg: 17 Min: 12 Max: 35 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 50473 in 00:01:42 = 495.5/s Avg: 17 Min: 8 Max: 94 Err: 0 (0.00%)
summary + 15632 in 00:00:30 = 521.1/s Avg: 19 Min: 11 Max: 82 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 66105 in 00:02:12 = 501.3/s Avg: 18 Min: 8 Max: 94 Err: 0 (0.00%)
summary + 16662 in 00:00:30 = 555.2/s Avg: 17 Min: 10 Max: 50 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 82767 in 00:02:42 = 511.3/s Avg: 18 Min: 8 Max: 94 Err: 0 (0.00%)
summary + 14862 in 00:00:30 = 495.6/s Avg: 20 Min: 11 Max: 146 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 97629 in 00:03:12 = 508.8/s Avg: 18 Min: 8 Max: 146 Err: 0 (0.00%)
summary + 16667 in 00:00:30 = 555.5/s Avg: 17 Min: 11 Max: 81 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 114296 in 00:03:42 = 515.2/s Avg: 18 Min: 8 Max: 146 Err: 0 (0.00%)
summary + 14111 in 00:00:30 = 470.3/s Avg: 20 Min: 10 Max: 126 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 128407 in 00:04:12 = 509.8/s Avg: 18 Min: 8 Max: 146 Err: 0 (0.00%)
summary + 16451 in 00:00:30 = 548.4/s Avg: 18 Min: 11 Max: 80 Err: 0 (0.00%) Active: 10 Started: 10 Finished: 0
summary = 144858 in 00:04:42 = 513.9/s Avg: 18 Min: 8 Max: 146 Err: 0 (0.00%)
summary + 13647 in 00:00:30 = 454.9/s Avg: 18 Min: 9 Max: 37 Err: 0 (0.00%) Active: 19 Started: 29 Finished: 10
summary = 158505 in 00:05:12 = 508.2/s Avg: 18 Min: 8 Max: 146 Err: 0 (0.00%)
summary + 28585 in 00:00:30 = 952.9/s Avg: 93 Min: 13 Max: 909 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 187090 in 00:05:42 = 547.3/s Avg: 29 Min: 8 Max: 909 Err: 0 (0.00%)
summary + 31629 in 00:00:30 = 1054.3/s Avg: 94 Min: 34 Max: 240 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 218719 in 00:06:12 = 588.2/s Avg: 39 Min: 8 Max: 909 Err: 0 (0.00%)
summary + 31443 in 00:00:30 = 1048.1/s Avg: 95 Min: 33 Max: 450 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 250162 in 00:06:42 = 622.5/s Avg: 46 Min: 8 Max: 909 Err: 0 (0.00%)
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summary = 279867 in 00:07:12 = 648.0/s Avg: 52 Min: 8 Max: 1007 Err: 0 (0.00%)
summary + 31843 in 00:00:30 = 1061.4/s Avg: 94 Min: 35 Max: 221 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 311710 in 00:07:42 = 674.9/s Avg: 56 Min: 8 Max: 1007 Err: 0 (0.00%)
summary + 29381 in 00:00:30 = 979.3/s Avg: 102 Min: 18 Max: 1046 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 341091 in 00:08:12 = 693.5/s Avg: 60 Min: 8 Max: 1046 Err: 0 (0.00%)
summary + 31766 in 00:00:30 = 1058.9/s Avg: 94 Min: 33 Max: 295 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 372857 in 00:08:42 = 714.5/s Avg: 63 Min: 8 Max: 1046 Err: 0 (0.00%)
summary + 31819 in 00:00:30 = 1060.6/s Avg: 94 Min: 32 Max: 247 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 404676 in 00:09:12 = 733.3/s Avg: 65 Min: 8 Max: 1046 Err: 0 (0.00%)
summary + 31804 in 00:00:30 = 1060.1/s Avg: 94 Min: 33 Max: 245 Err: 0 (0.00%) Active: 100 Started: 110 Finished: 10
summary = 436480 in 00:09:42 = 750.1/s Avg: 67 Min: 8 Max: 1046 Err: 0 (0.00%)
summary + 29692 in 00:00:33 = 892.5/s Avg: 95 Min: 21 Max: 232 Err: 0 (0.00%) Active: 1 Started: 111 Finished: 110
summary = 466172 in 00:10:15 = 757.8/s Avg: 69 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 492993 in 00:10:42 = 768.1/s Avg: 72 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 524778 in 00:11:12 = 781.1/s Avg: 76 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 556517 in 00:11:42 = 792.9/s Avg: 80 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 587774 in 00:12:12 = 803.1/s Avg: 83 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 619520 in 00:12:42 = 813.2/s Avg: 86 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 651140 in 00:13:12 = 822.3/s Avg: 89 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 682452 in 00:13:42 = 830.4/s Avg: 91 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 713639 in 00:14:12 = 837.7/s Avg: 94 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 777012 in 00:15:12 = 852.1/s Avg: 97 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 802603 in 00:15:42 = 852.1/s Avg: 99 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 834410 in 00:16:12 = 858.6/s Avg: 103 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 866297 in 00:16:42 = 864.7/s Avg: 106 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 961026 in 00:18:12 = 880.2/s Avg: 114 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 1024489 in 00:19:12 = 889.4/s Avg: 119 Min: 8 Max: 1046 Err: 0 (0.00%)
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summary = 1145040 in 00:21:12 = 900.3/s Avg: 129 Min: 8 Max: 1094 Err: 0 (0.00%)
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summary = 1244549 in 00:22:42 = 913.9/s Avg: 140 Min: 2 Max: 2008 Err: 6155 (0.49%)
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summary = 1278529 in 00:23:12 = 918.6/s Avg: 143 Min: 2 Max: 2008 Err: 8528 (0.67%)
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summary = 1310433 in 00:23:42 = 921.5/s Avg: 147 Min: 2 Max: 2008 Err: 9589 (0.73%)
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summary = 1378402 in 00:24:42 = 930.2/s Avg: 152 Min: 2 Max: 2008 Err: 15123 (1.10%)
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summary = 1414069 in 00:25:12 = 935.3/s Avg: 155 Min: 2 Max: 2008 Err: 19112 (1.35%)
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summary = 1440777 in 00:25:42 = 934.4/s Avg: 157 Min: 2 Max: 2008 Err: 19852 (1.38%)
summary + 34526 in 00:00:30 = 1150.9/s Avg: 347 Min: 2 Max: 884 Err: 2953 (8.55%) Active: 400 Started: 1160 Finished: 760
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summary = 1519002 in 00:26:42 = 948.3/s Avg: 164 Min: 2 Max: 2066 Err: 34943 (2.30%)
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summary = 1561743 in 00:27:12 = 957.0/s Avg: 168 Min: 2 Max: 2066 Err: 46303 (2.96%)
summary + 36867 in 00:00:30 = 1228.9/s Avg: 323 Min: 2 Max: 2284 Err: 9606 (26.06%) Active: 400 Started: 1160 Finished: 760
summary = 1598610 in 00:27:42 = 961.9/s Avg: 171 Min: 2 Max: 2284 Err: 55909 (3.50%)
summary + 35582 in 00:00:30 = 1186.1/s Avg: 337 Min: 2 Max: 861 Err: 4119 (11.58%) Active: 400 Started: 1160 Finished: 760
summary = 1634192 in 00:28:12 = 965.9/s Avg: 175 Min: 2 Max: 2284 Err: 60028 (3.67%)
summary + 43598 in 00:00:30 = 1453.3/s Avg: 275 Min: 2 Max: 2211 Err: 12075 (27.70%) Active: 400 Started: 1160 Finished: 760
summary = 1677790 in 00:28:42 = 974.4/s Avg: 177 Min: 2 Max: 2284 Err: 72103 (4.30%)
summary + 43611 in 00:00:30 = 1453.7/s Avg: 274 Min: 2 Max: 797 Err: 11925 (27.34%) Active: 400 Started: 1160 Finished: 760
summary = 1721401 in 00:29:12 = 982.6/s Avg: 180 Min: 2 Max: 2284 Err: 84028 (4.88%)
summary + 37447 in 00:00:30 = 1248.2/s Avg: 320 Min: 2 Max: 2263 Err: 10223 (27.30%) Active: 400 Started: 1160 Finished: 760
summary = 1758848 in 00:29:42 = 987.1/s Avg: 183 Min: 2 Max: 2284 Err: 94251 (5.36%)
summary + 36504 in 00:00:30 = 1216.8/s Avg: 328 Min: 2 Max: 982 Err: 4915 (13.46%) Active: 400 Started: 1160 Finished: 760
summary = 1795352 in 00:30:12 = 990.9/s Avg: 186 Min: 2 Max: 2284 Err: 99166 (5.52%)
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summary = 1828803 in 00:30:42 = 992.9/s Avg: 187 Min: 2 Max: 2284 Err: 106650 (5.83%)
summary + 41694 in 00:00:30 = 1389.8/s Avg: 348 Min: 2 Max: 1712 Err: 10112 (24.25%) Active: 500 Started: 1660 Finished: 1160
summary = 1870497 in 00:31:12 = 999.3/s Avg: 191 Min: 2 Max: 2284 Err: 116762 (6.24%)
summary + 36909 in 00:00:30 = 1230.3/s Avg: 405 Min: 3 Max: 2820 Err: 10518 (28.50%) Active: 500 Started: 1660 Finished: 1160
summary = 1907406 in 00:31:42 = 1002.9/s Avg: 195 Min: 2 Max: 2820 Err: 127280 (6.67%)
summary + 42118 in 00:00:30 = 1403.9/s Avg: 357 Min: 2 Max: 2264 Err: 10503 (24.94%) Active: 500 Started: 1660 Finished: 1160
summary = 1949524 in 00:32:12 = 1009.1/s Avg: 198 Min: 2 Max: 2820 Err: 137783 (7.07%)
summary + 38779 in 00:00:30 = 1292.6/s Avg: 385 Min: 2 Max: 2260 Err: 12096 (31.19%) Active: 500 Started: 1660 Finished: 1160
summary = 1988303 in 00:32:42 = 1013.5/s Avg: 202 Min: 2 Max: 2820 Err: 149879 (7.54%)
summary + 43672 in 00:00:30 = 1455.7/s Avg: 343 Min: 2 Max: 1945 Err: 12053 (27.60%) Active: 500 Started: 1660 Finished: 1160
summary = 2031975 in 00:33:12 = 1020.1/s Avg: 205 Min: 2 Max: 2820 Err: 161932 (7.97%)
summary + 37380 in 00:00:30 = 1246.0/s Avg: 398 Min: 3 Max: 2974 Err: 10396 (27.81%) Active: 500 Started: 1660 Finished: 1160
summary = 2069355 in 00:33:42 = 1023.5/s Avg: 208 Min: 2 Max: 2974 Err: 172328 (8.33%)
summary + 41902 in 00:00:30 = 1396.7/s Avg: 360 Min: 2 Max: 2179 Err: 10557 (25.19%) Active: 500 Started: 1660 Finished: 1160
summary = 2111257 in 00:34:12 = 1028.9/s Avg: 211 Min: 2 Max: 2974 Err: 182885 (8.66%)
summary + 38501 in 00:00:30 = 1283.4/s Avg: 387 Min: 2 Max: 2378 Err: 11831 (30.73%) Active: 500 Started: 1660 Finished: 1160
summary = 2149758 in 00:34:42 = 1032.6/s Avg: 214 Min: 2 Max: 2974 Err: 194716 (9.06%)
summary + 44312 in 00:00:30 = 1477.1/s Avg: 339 Min: 2 Max: 2143 Err: 12682 (28.62%) Active: 500 Started: 1660 Finished: 1160
summary = 2194070 in 00:35:12 = 1038.9/s Avg: 217 Min: 2 Max: 2974 Err: 207398 (9.45%)
summary + 34259 in 00:00:30 = 1142.0/s Avg: 353 Min: 3 Max: 1815 Err: 8194 (23.92%) Active: 91 Started: 1751 Finished: 1660
summary = 2228329 in 00:35:42 = 1040.4/s Avg: 219 Min: 2 Max: 2974 Err: 215592 (9.68%)
summary + 46247 in 00:00:30 = 1541.6/s Avg: 543 Min: 2 Max: 3542 Err: 14651 (31.68%) Active: 1000 Started: 2660 Finished: 1660
summary = 2274576 in 00:36:12 = 1047.3/s Avg: 226 Min: 2 Max: 3542 Err: 230243 (10.12%)
summary + 43564 in 00:00:30 = 1452.1/s Avg: 680 Min: 3 Max: 4335 Err: 17180 (39.44%) Active: 1000 Started: 2660 Finished: 1660
summary = 2318140 in 00:36:42 = 1052.8/s Avg: 234 Min: 2 Max: 4335 Err: 247423 (10.67%)
summary + 47173 in 00:00:30 = 1572.4/s Avg: 627 Min: 2 Max: 3487 Err: 16020 (33.96%) Active: 1000 Started: 2660 Finished: 1660
summary = 2365313 in 00:37:12 = 1059.8/s Avg: 242 Min: 2 Max: 4335 Err: 263443 (11.14%)
summary + 39308 in 00:00:30 = 1310.3/s Avg: 719 Min: 4 Max: 4907 Err: 11648 (29.63%) Active: 1000 Started: 2660 Finished: 1660
summary = 2404621 in 00:37:42 = 1063.1/s Avg: 250 Min: 2 Max: 4907 Err: 275091 (11.44%)
summary + 45027 in 00:00:30 = 1500.2/s Avg: 701 Min: 8 Max: 6175 Err: 14443 (32.08%) Active: 1000 Started: 2660 Finished: 1660
summary = 2449648 in 00:38:12 = 1068.8/s Avg: 258 Min: 2 Max: 6175 Err: 289534 (11.82%)
summary + 43309 in 00:00:30 = 1444.2/s Avg: 655 Min: 4 Max: 3946 Err: 14729 (34.01%) Active: 1000 Started: 2660 Finished: 1660
summary = 2492957 in 00:38:42 = 1073.7/s Avg: 265 Min: 2 Max: 6175 Err: 304263 (12.20%)
summary + 46909 in 00:00:30 = 1563.6/s Avg: 644 Min: 5 Max: 4922 Err: 17650 (37.63%) Active: 1000 Started: 2660 Finished: 1660
summary = 2539866 in 00:39:12 = 1079.9/s Avg: 272 Min: 2 Max: 6175 Err: 321913 (12.67%)
summary + 42572 in 00:00:30 = 1418.8/s Avg: 663 Min: 4 Max: 3914 Err: 12785 (30.03%) Active: 1000 Started: 2660 Finished: 1660
summary = 2582438 in 00:39:42 = 1084.2/s Avg: 279 Min: 2 Max: 6175 Err: 334698 (12.96%)
summary + 41909 in 00:00:30 = 1397.2/s Avg: 752 Min: 3 Max: 5582 Err: 13462 (32.12%) Active: 1000 Started: 2660 Finished: 1660
summary = 2624347 in 00:40:12 = 1088.1/s Avg: 286 Min: 2 Max: 6175 Err: 348160 (13.27%)
summary + 45799 in 00:00:30 = 1547.9/s Avg: 646 Min: 10 Max: 3147 Err: 15120 (33.01%) Active: 0 Started: 2660 Finished: 2660
summary = 2670146 in 00:40:41 = 1093.7/s Avg: 292 Min: 2 Max: 6175 Err: 363280 (13.61%)
Tidying up ... @ Wed Jan 15 11:39:29 CST 2020 (1579059569592)
... end of run
D:\software\apache-jmeter-3.3\bin>
分析见
https://blog.51cto.com/6183574/2445386
注意：高并发时，查看jmeter日志可能会看到如下错误：
Non HTTP response code: java.net.BindException/Non HTTP response message: Address already in use: connect
这个问题的原因是windows端口被耗尽了（默认1024-5000），而且操作系统要 2~4分钟才会重新释放这些端口，所以可以增加windows的可用端口来解决。windows端口最大数为65534
解决方法见
http://www.bubuko.com/infodetail-3306240.html
来源：CSDN
作者：yeki_30
链接：https://blog.csdn.net/u010924720/article/details/103983896