JMeter custom log and log analysis

1 JMeter Log overview

JMeter And Java Same procedure , The event log will be recorded , The log file is saved in bin Directory , The name is jmeter.log. Of course , We can also view the log directly in the panel , Click the yellow sign in the upper right corner to open the log panel , Click close again .
so , Logs can help us locate some problems that are not easy to detect directly .

in addition ,JMeter You can easily set the log output level ：

2 JMeter Custom log

All the above are system logs , That is to say JMeter The log printed by itself . If we want to output some logs by ourselves , What to do ？ This usually needs the help of Beanshell 了 .

for example , The response result of an interface is as follows ：

Add... Under this request Beanshell Assertion , After operation , The corresponding content is output in the log ：

import org.apache.log4j.Logger;

//  Get the response data of the interface 
String result = prev.getResponseDataAsString();

if(result.contains("error")){
    
  Failure=true;
  log.error(" Interface failed : " + result);
}

Of course , The most important role of user-defined logs is Linux When running scripts on the server , Because there is no interface , Troubleshooting is more troublesome .

Take on the previous , take JMeter The script is deployed to Linux Stress test on the server , There are some inconveniences ：

All requests are included in the throughput statistics , Including some auxiliary requests (beanshell request ), Lead to real tps The statistics are not accurate .

Whether the business is successful , And the specific reasons for the failure are difficult to investigate .

First , The response content of the test interface is shown in the figure ：
Add 2 individual 【JSON Path Extractor】, It is respectively used to extract code、orderId.


Then add 【BeanShell Assertion 】：

import org.apache.log4j.Logger;

//  Get the response data of the interface 
String result = prev.getResponseDataAsString();
//  from JSON Get... From the extractor code and orderId
String code = vars.get("code");
String orderId = vars.get("orderId");

if(code.equals("0")){
    
  log.info("place order success, orderId=" + orderId);
}else{
    
  Failure=true;
  log.error("FailureMessage: " + result);
}

Upload the script to Linux in , By the way, write a startup script ：start.sh

#!/bin/bash
jmeter_log=/home/test/jmeter.log

if [ -f "$jmeter_log" ]; then
 //  Backup and delete the original log file 
 cp $jmeter_log /home/test/jmeter.log_back
 rm -rf $jmeter_log
fi
//  start-up JMeter Script 
jmeter -n -t /home/test/test.jmx -l /home/test/result/test.jtl

After running the script ,cat jmeter.log, The effect is as follows ：

3 JMeter Log analysis

Write a log analysis script for this log logAnalysis.sh：

#!/bin/bash
jmeter_log=/home/test/jmeter.log
thread_num=`grep 'Thread started' $jmeter_log|tail -n 1|awk -F"-" '{print$6}'`
start_time=`grep 'All thread groups have been started' $jmeter_log|awk -F" " '{print $1,$2}'|awk -F"," '{print $1}'`
end_time=`grep 'Shutdown hook ended' $jmeter_log|awk -F" " '{print $1,$2}'|awk -F"," '{print $1}'`

final_success_time=`grep "place order success" $jmeter_log|tail -n 1|awk -F" " '{print$1,$2}'|awk -F"," '{print$1}'`
success_running_time=$[ $(date -d "$final_success_time" +%s) - $(date -d "$start_time" +%s) ]
running_time=$[ $(date -d "$end_time" +%s) - $(date -d "$start_time" +%s) ]
cancle_times=`grep "cancle orders success" $jmeter_log|wc -l`   // Cancellation times 

success_times=`grep success $jmeter_log|wc -l`   //  Number of successes 
failure_times=`grep FailureMessage $jmeter_log|wc -l`
request_times=$[ $success_times+$failure_times ]
error_rate=`echo "scale=2; $failure_times/$request_times*100" | bc`
qps=$[ $request_times/$running_time ]
throughput=$[ $success_times/$success_running_time ]

echo -e ' Number of threads :'$thread_num
echo -e ' Number of requests :' $request_times
echo -e ' Number of successes :' $success_times
echo -e ' Number of failures :' $failure_times
echo -e ' Cancellation times :'$cancle_times
echo -e ' Error rate :' $error_rate'%'
echo -e ' Starting time :'$start_time
echo -e ' End time :'$end_time
echo -e ' Last successful request time :'$final_success_time
echo -e ' Request time :' $running_time 
echo -e ' Successful run time :'$success_running_time
echo -e ' throughput :'$throughput'/s'
echo -e 'QPS:'$qps'/s'

When JMeter After the script runs for a while , perform logAnalysis.sh, The effect is as follows ：

 Number of threads :180
 Number of requests : 131691
 Number of successes : 131493
 Number of failures : 198
 Cancellation times :141
 Error rate : 0%
 Starting time :2018-11-28 15:34:54
 End time :2018-11-28 15:37:17
 Last successful request time :2018-11-28 15:37:17
 Request time : 143
 Successful run time :143
 throughput :919/s
QPS:920/s

You can see , The output information is comprehensive and clear . such , We can do that linux Run under JMeter Pressure test script , Get the details of pressure measurement in real time .

Finally, thank everyone who reads my article carefully , The following online link is also a very comprehensive one that I spent a few days sorting out , I hope it can also help you in need ！

These materials , For those who want to change careers 【 software test 】 For our friends, it should be the most comprehensive and complete war preparation warehouse , This warehouse also accompanied me through the most difficult journey , I hope it can help you ！ Everything should be done as soon as possible , Especially in the technology industry , We must improve our technical skills . I hope that's helpful ……

If you don't want to grow up alone , Unable to find the information of the system , The problem is not helped , If you insist on giving up after a few days , You can click the small card below to join our group , We can discuss and exchange , There will be various software testing materials and technical exchanges .

Typing is not easy , If this article is helpful to you , Click a like, collect a hide and pay attention , Give the author an encouragement . It's also convenient for you to find it quickly next time .

Self study recommendation B Stop video ：

Zero basis transition software testing ： Self taught software testing , Got the byte test post offer, Is the B The best video station ！

Advanced automation testing ： Huawei has landed , Salary increase 20K,2022 Most suitable for self-study python Automated test tutorial , Spend it yourself 16800 Bought , Free sharing