I am using:-
- windows10,
- processor: Intel Core i3#2.00GHz,
- RAM:8.00GB,
- 64- bit OS.
- jmeter 4.0
the scenario is I have to pass/send a request for JSON data in Jmeter body.
I have to pass/send request of 50mb JSON data in the JMeter body.
But the problem is when my JSON data size more than 700kb, after that my system has freeze/not responding.
So, how can I pass/send request of JSON data size from 700kb to 50mb in JMeter with a single Request?
Make sure to run your test in command-line non-GUI mode
Make sure to increase JVM Heap Size so your file will fit into memory given the number of threads you're going to use multiplied by file size plus ~1 GB for JMeter to operate.
Follow recommendations from 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure, especially:
don't use any Listeners
don't save request/response data
You can also consider using HTTP Raw Request plugin which is capable of sending files to the server without loading it into memory first.
Related
I am using jmeter to load test a website. I have tested from 1 to 400 users. however while testing for above 500 users/threads, I am getting 401/unauthorized error for few users. Hope you'll help me to find out a solution to this problem.
I can think of 3 possible reasons:
There is a parameterization problem with your test, i.e. it sends wrong credentials, you can use i.e. Simple Data Writer configured to save requests and response data for failing requests and inspect it using View Results Tree listener.
JMeter gets overloaded and cannot properly perform correlation. In addition to point 1 check whether you're following JMeter Best Practices and ensure that JMeter has enough headroom to operate in terms of CPU, RAM, etc. using i.e. JMeter PerfMon Plugin
Your application gets overloaded and cannot handle 500+ users, check your application logs, resources usage, output of APM tools, etc.
my test scenario's are to identify the performance metrics of 10 and then 100 concurrent downloads of a 15GB file.
Unfortunately my RAM is only 8GB and cannot increase any more than that.
ive tried using 'save response to file' listener but that is using memory instead of disk space.
Do we have any script to store response i.e. file being downloaded to disk space instead of memory?
I don't think you can achieve it using JMeter's HTTP Request sampler, the only way I can think of is writing your file retrieval logic using JSR223 Sampler and Groovy language and send the content of the file to /dev/null using i.e. NullOutputStream or EntityUtils.consumeQuietly() function to discard the output.
I'm getting the following error:
out of memory error : java heap space error while running jmeter script for long run say 20 hrs.
I have set 10 GB heap size to run 10 threads only.
Could it be my application's bug? How can I be sure that this is application's bug not a jmeter issue?
JMeter is a Java application with a GUI. It also supports a non-GUI mode which is less resource intensive(CPU/RAM). If we run JMeter in non-GUI mode, it will consume less resource and we can run more threads.
Disable ALL Listeners during the Test Run. They are only for debugging and use them to design the desired script.
Listeners should be disabled during load tests. Enabling them causes additional overheads, which consume valuable resources that are needed by more important elements of your test.
Use Up-to-Date Software:
Java and JMeter should be kept updated.
Decide Which Metrics You Need to Store:
When it comes to storing requests and response headers, assertion results and response data can consume a lot of memory! So it is wise try not to store these values on JMeter unless it’s absolutely necessary.
JMeter SaveService badly configured: Check if you are saving requests and responses in your JTL.
For better and more elaborated understanding, this blog about 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure is helpful.
We are using Apache JMeter for the performance testing of web application. Apparently response time is too high in comparison to loading page in browser during load. When we open the page during load it opens in 2 seconds however JMeter reports 70 seconds. I understand browser memory cache and disk cache are used in browser however isn't JMeter cache manager does same. How to assert it, comparing response header is one option. Any thoughts on this will be appreciated.
It may be wrong configuration in the script. There won't be much difference between web browser and Jmeter response times (browser rendering time is ignored in Jmeter, not a big factor but must be considered)
If you are using single Http Sampler for a web page and retrieving all resources in tha page, then select "Parallel Downloads" option to '6' in Http sampler advanced section. So, you are simulating the browser behaviour of parallel downloading of the resources like .js, .css, images etc.
If you recorded the script using Test Script Recorder, then there will be an Http Sampler for each resource requet for that page which will be sent sequentially, hence increase in response time. You might be in this case, as of now, there is no feature/option to send the http samplers in parallel. so I suggest using the approach of adding one sampler, use parallel download of resources option in Http Sampler advanced section.
Also, caching is an important factor which decides the response time. Adding Http Cache manager can solve the issue in jmeter. This simulates browser behaviour of caching. I don't think there will be huge difference b/w browser and jmeter in implementing caching althought may not be perfect.
The reason could be the lack of resources on JMeter machine or JMeter not being properly configured for producing high loads. JMeter default configuration is good for load tests development and debugging, you can run load tests up to certain amount of virtual users, but if you need to conduct a really high loads - you need to perform some configuration changes.
First of all, double check my guess using jvisualvm and your operating system monitoring tools (there is PerfMon JMeter Plugin which can be used for monitoring different metrics on application under test and JMeter load generators sides). If it is the case - take the next steps to get the most performance of your JMeter installation:
Increase JVM Heap Size, NewSize, switch to ConcurrentMarkSweep Garbage Collector.
Run your test in non-GUI mode.
Disable all the listeners during the test.
Follow other recommendations from 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure article.
I'm using JMeter to test a Java application written by a 3rd party vendor using Versata Logic Studio.
I've got some steps in my test plan that submit a request using some post data and then receive a response back:
Response too large to be displayed. Size: 445817 > Max: 204800, Start of message:
{"header":{"action":"300","arguments":{"tabid":"Header","divid":"ActgDisb,Vendor,BusinessType...ETC
This seems fine (I'm guessing that's 400K?), except that the step is taking far longer than it does to click through the pages in a browser. In the browser it takes 5 seconds at most. In JMeter it's taking 2 minutes. The CPU is also at 60% for just one thread during these steps.
Any ideas on speeding this up? We're struggling to get enough slaves going and this certainly isn't helping.
The message that is displayed tells that you are using View Result Tree during your load test. Jmeter sets a limit that can be changed on the size of pages displayed in this component by adding to user.properties file:
view.results.tree.max_size which defaults to 200 ko
BUT during a load test never ever use this component as it requires a lot of resources (memory and cpu). This component must only be used during scripting phase.
You can read this article that gives tips on JMeter configuration and tuning:
http://www.ubik-ingenierie.com/blog/jmeter_performance_tuning_tips/
Disclaimer : I wrote it and it's my company but IMHO I think it's worth reading :-)
Also read this:
http://jmeter.apache.org/usermanual/component_reference.html
If your JMeter script is using a lot of file I/O, then putting those files in RAM will significantly improve the speed. You can use any app such as IMDisk (freeware) to create a virtual disk in RAM. Make sure that you have more than 4GB RAM.
In our case, we are sending around 8000 small files per user. With 200 users on each system, Jmeter is reading 16 Lack files. This was the bottleneck. With the RAM Disk, the file read speed was increased by 20 times and it helped Jmeter to run at full speed.
If you're ready to move to TCP level, there is HTTP Raw Request that allows memory-efficient operation for huge uploads/downloads. Read its manual carefully, there is some JMeter properties for tuning its performance.
However, my experience is that you possibly have a situation where Java itself is a bad technology to perform load tests. I suggest you to take a pair of tries for Raw Request and in case of failure to seek for some C/C++ tool for performance tests.