I want to install the JMeter client on each desktop, and then gather data from where each JMeter client generate after it run test. Using these data, I want to make chart for TPS over threads and bytes throughput over threads.
You can use step by step guide provided by jmeter here.
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I'd few ques on technical details of JMeter mostly pertaining to distributed setup vs independent JMeter engines (since JMeter controller can become a bottleneck in case of several JMeter load generators). Would be great if anybody can help with the understanding here -
How is JMeter distributed setup orchestrated by JMeter controller (i.e. called master or client)? Can we use the same logic to synchronize test among independent JMeter engines (independent mode)?
Is there a way to pool connections across vUsers?
Function of ASYNC_QUEUE in backend listener and it's expected side-effects in independent mode (mentioned above), what happens when queue is full?
Does/Is there a way for JMeter to execute javascript/act as headless browser?
How does DNS resolution happen for JMeter? Does it resolve for each vuser?
Your "question" looks like a compilation of interview questions rather than something connected with your single current concern and I don't think it's a proper place/way to ask it, I believe it should be: one post - one question.
Whatever
How is JMeter distributed setup orchestrated by JMeter controller - JMeter master sends .jmx script to slaves and collects results from them. Theoretically you can implement your own mechanism for delivering the test plan and eventual dependencies to the individual JMeter engines and running the test at the same time. Then you will need to collect the .jtl results files from the engines and combine it into a single one.
Is there a way to pool connections across vUsers? - JMeter does it internally
When the queue is full no more new sample results will be taken for processing by the backend listener so the results won't be "realtime" anymore, you will see the new results as free slots will be appearing in the queue
For JMeter per-se - no, AJAX calls can be simulated using Parallel Controller, for client-side performance testing, JavaScript execution profiling and rendering speed measurement you will need to use a read browser, no matter normal or headless, there is WebDriver Sampler plugin providing JMeter integration with Selenium
DNS resolution is dependent on underlying OS and/or JVM DNS resolution implementation, there is DNS Cache Manager which enables overriding hosts entries and using custom DNS resolver so each thread looks up the IP address on its own
We have a Rest Server talking to 128 devices. I need to send 10 API calls to each device and to all 128 devices at the same time. So the Rest server needs to handle 1280 at a time every 15 mins. I am using jmeter and can create 1280 threads to make each API call unique to go to all 128 devices manually. Is there a better way to do it other than manually typing and populating the threads?
Basically, I am looking to automate the process of creating the threads through a script and load the jmx to GUI, or better/faster way using GUI itself
Normally the following test elements are being used:
Recording: using HTTP(S) Test Script Recorder for automation of the HTTP Request samplers creation. The idea is that you execute your test scenario on mobile device and JMeter captures the traffic and creates the relevant requests.
Parameterization: if your want to use different data for different virtual users you can configure JMeter to read it from external sources (files, databases, etc.), the most commonly used test element is CSV Data Set Config
Synchronizing Timer: this guy ensures that samplers it its scope are executed at exactly the same moment. Normally JMeter executes requests as fast as it can, but it doesn't guarantee that requests will happen at exactly the same moment unless you use the Syncrhonizing Timer.
I want to test a mobile application with 30k load in jmeter with cloud set-up,as i have never done such a huge v.user load in jmeter and with distributed load,please help me how to proceed with detailed step by step.
I have worked in jmter for past 5-6 months but with only one load generator machine with 200-300 V.user.
The approach is the same but with one interim step.
Configure JMeter for the maximum performance. See 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure for tuning tips.
Determine how many users you are able to simulate from a single machine (gradually increase the number of users and monitor load generator resources consumption)
Calculate how many machines you will need
Install JMeter and run jmeter-server on them. See Apache JMeter Distributed Testing Step-by-step guide for details
Run your test, analyze results, raise issues.
The JMeter documentation brilliantly captures how to run a distributed test. With that said, in a nutshell -
you would need one machine to act as a master and others as a slave
manage your data on each node (look at setting up some CI tool to help run some copy jobs before you kick off your test. This will help copy your test data accordingly)
You have 3 options:
Simple One : Use a SAAS solution that offers JMeter, there a many:
Redline13
Flood.io
Blazemeter
LoadFocus
Use this free tool that allows load testing on AWS
Use JMeter distributed testing, you can see this new tutorial from Apache JMeter
To ensure you have the most efficient test, ensure you follow best-practices.
I am looking to monitor live user responses through jmeter. Can the backend listener in jmeter used to record live users(end users)? I am not talking about virtual users that we set up in jmeter. But the real end users.How can this be achieved?
Editing to add more details:
Our requirement is to monitor the real users, in 2-3 geographical locations, all through out the business hours..say from 8 to 5.
For this purpose, do you think, I need to have a dedicated machine with jmeter, grafana and influxdb for monitoring alone? I have other testing going on using jmeter and I don't want to use the same machine to do both monitoring and testing. DO you think this is achievable by jmeter? ANy suggestions?
you can use the following tools in combination to achieve live monitoring:
JMeter backend Listener - to send results to influxDB
influxdb - store the results sent by backend listener
grafana - run continuous queries for metrics and plot graphs like average response times etc.
Follow the steps mentioned here:
http://jmeter.apache.org/usermanual/realtime-results.html - First Option
https://www.linkedin.com/pulse/jmeter-live-performance-monitoring-dashboard-grafana-influxdb-sarker
http://www.testautomationguru.com/jmeter-real-time-results-influxdb-grafana/
http://techblogsearch.com/a/live-performance-result-monitoring-with-jmeter-grafana-influxdb.html
We use to perform general production app (here- Scada-LTS) monitoring by javamelody. But this will give You general statistics. For per user monitoring it seems You should use log4j + ELK or other simpler syslog analyzing tool.
Jmeter should be used rather for test environment for stress tests.
I'm have a simple JMeter script with 300 threads that checks a list of 30 static URLs with a 2 second delay between requests.
I'm hitting CPU usage limit on my machine (EC2 Large Server).
Any idea on which switch and levers have the greatest impact on server resources?
For example:
Number of threads
Delay between requests
Number of steps (URLs) in script
Versions of JMeter (2.9 vs 2.10)
Thanks
Ophir
Just make sure that you've
Disabled all listeners
Running JMeter in non-GUI mode, i.e. via command-line, Ant, Maven or whatever
Your Post Processors (if any) aren't resource-consuming, i.e. you're trying to extract something with Regular Expression Extractor from immense output.
You're using the latest version of JMeter and Java (JMeter 2.10 is better than 2.9)
You're using 64-bit Java with enough heap space provided
You're following JMeter Best Practices
If you problem still persists, you can consider looking into following options:
Profile Java process running JMeter to detect what classes are most CPU-consuming
Use several "lesser" EC2 instances with 1 JMeter "master" and 2-3 slaves
If you have static URLs, just:
Use a CSV DataSet which will contain these URLs
One HTTP Request Sampler that will use it
With a large Server, 300 threads is really nothing.
You may read :
http://jmeter.apache.org/usermanual/best-practices.html
http://www.dzone.com/links/see_how_to_make_jmeter_run_thousands_of_threads_w.html