My Jmeter script have 2 requests Login and Logout with response time around 13-15 sec together (Login is 12-14 sec and Logout is 0.5sec). I need to run these 2 requests one after other to reach N transactions(for each request exactly) in one hour.So together 2N transactions/hour. How can I achieve this.
The most straightforward approach is just to increase number of threads in the Thread Group. If 1 user can execute both requests in 15 seconds it means that he can execute 4 requests per minute or 240 requests per hour.
However given your response times are fluctuating between 13 and 15 you might want to reduce JMeter's throughput slightly using i.e. Constant Throughput Timer or Precise Throughput Timer
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I am working with 1 master, 50 slaves. Number of threads: 20
I have 1 thread and there are 3 samples in it. I'm starting the tests, but as a result of the test, I see that you are going 500-700 requests.
1000 requests from each should go. But it doesn't go.
You have 20*50=1000 threads in total.
You can reach 1000 requests per second only if response time is 1 second sharp.
If response time will be 0.5 seconds - you will get 2000 requests per second
If response time will be 2 seconds - you will get 500 requests per second.
If you need to simulate X requests per second you need to add more threads (or alternatively go for Concurrency Thread Group and Throughput Shaping Timer combination)
But remember that the application under test must be able to respond fast enough because if it doesn't - any JMeter tweaks won't make any difference.
By the way, 1000 requests can be simulated from a modern mid-range laptop without any issues (unless your requests are "very heavy"), just make sure to follow JMeter Best Practices
I am conducting a performance test (TPS) using jmeter.
I am requesting about 10,000 TPS, but the following two results are different.
(Position that 10,000 TPS responds normally)
1000 thread x 600 target throughput(in samples per minute)
100 thread x 6000 target throughput(in samples per minute)
I think the two results should be the same, but why is the response time delayed as the thread increases?
I think the two results should be the same - why they would be the same?
Let's imagine your system has fixed response time of 1 second, in that case:
With 1000 threads you will get 1000 requests per second and you can limit the throughput to 10 requests per second using the Constant Throughput Timer
With 100 threads you will get 100 requests per second, no limiting is required
And what if response time is 2 seconds?
With 1000 threads you will get 500 requests per second
With 100 threads you will get 50 requests per second
Constant Throughput Timer:
acts precise enough on "minute" scale, if your test lasts less than minute it might not apply the throughput
can only pause the threads to limit the throughput (requests per minute) to the desired value. If current number of threads is not enough in order to conduct the required load - the time won't have any effect.
If you want to send requests at the rate of 10000 TPS it worth considering going for the Throughput Shaping Timer and Concurrency Thread Group combination connected via the Feedback Function in this case JMeter will be able to kick off extra threads if current number is not sufficient.
But also be informed that:
JMeter should be able to start as many threads as needed to send 10000 TPS so make sure to follow JMeter Best Practices or even consider going for Distributed Testing Mode
Application needs to be able to handle the load and respond fast enough, JMeter waits for the previous response before starting the new request so if application is able to serve i.e. 5000 requests per second only you won't be able to reach 10000 by any means
i've started distributed performance testing using jmeter. If i give scenario 1:
no.of threads: 10
ramp up period: 1
loop count: 300
Everything runs smooth, as scenario 1 translates to 3000 requests in 300 seconds. i.e. 10 requests per second.
If i give scenario 2:
no.of threads: 100
ramp up period: 10
loop count: 30
Afaik, scenario2 is also executing 3000 requests in 300 seconds, i.e. 10 requests per second.
But things started failing i.e. sever is facing heavy load and requests fail. In theory both scenario1 and scenario2 should be same, right? Am i missing something?
All of these are heavy calls, each one will take 1-2 seconds under normal load.
In ideal world for scenario 2 you would have 100 requests per second and the test would finish in 30 seconds.
The fact that in 2nd case you have the same execution time indicates that your application cannot process incoming requests faster than 10 per second.
Try increasing ramp-up time for 2nd scenario and look into the following charts:
Active Threads Over Time
Response Times Over Time
Transactions Per Second
Normally when you increase the load the number of "Transactions Per Second" should increase by the same factor and "Response Time" should remain the same. Once response time starts growing and number of transactions per second starts decreasing it means that you passed the saturation point and discovered the bottleneck. You should report the point of maximum performance and investigate the reasons of the first bottleneck
More information: What is the Relationship Between Users and Hits Per Second?
In scenario 2 after 10 seconds you have 100 concurrent users which execute requests in parallel, your server may not handle well or prevent such load
Concurrent user load testing sends simultaneous artificial traffic to a web application in order to stress the infrastructure and record system response times during periods of sustained heavy load.
In scenario 1 after 10 seconds you have 10 concurrent users looping through the flow, without causing a load on server
Notice your server may have restriction on number of users requesting only on specific request(s)
We shall be very clear about the Rampup time
Following is extract from the official documentation
Scenario 1 : no.of threads: 10
ramp up period: 1
loop count: 300
In the above scenario 10 threads(virtual users) are to be created in 1 seconds. Each user will loop 300 times. Hence there will be 3000 requests to the server. Throughput cannot be calculated in advance with above configuration. It fluctuates based on the server capability, network etc. You could control the throughput with some components and plugins.
Scenario 2 : no.of threads: 100
ramp up period: 10
loop count: 30
In scenario 2 100 threads (virtual users) are created in 10 seconds. 100 virtual users will send requests concurrently to the server. Each user will send 30 requests. In the second scenario you will have higher throughput (number of requests per seconds) as compared to the scenario 1. Looks like server cannot handle the 100 users sending requests concurrently.
Ramp up time is applicable for the first cycle of each thread. It will simulate delays between first request of each user in their first iteration.
I am trying to send 1100 requests per minute to my API endpoint for a period of 5 minutes, so in total, I will make 5500 requests to the endpoint.
Based on the above requirement, Here is how I have set up my Jmeter:
It seems like I have misconfigured Jmeter, because in the end I can see Jmeter has made 8401 requests to the API instead of 5500.
What have I missed in the configuration?
Does the "Infinite" check-box need to be checked or unchecked?
The number of requests you're expecting (which is 5500) for this test plan is wrong.
As per your expectation, I think, you are making confusion between the Threads and Requests.
Ramp up is the time in which all the users arrive on your tested application server.
Requests are simulated by samplers but threads are the simulation of users.
According to your test plan:
- Total Number of Threads: 1100 vitual users
- Ramp-up time: 60 (1 min)
- Loop count: Infinite
- Test duration: 300 sec (5 min)
- No of requests/sampler in Test Plan: Unknown, assuming it 1
JMeter Execution:
JMeter will kick off those 1100 virtual users in 60 seconds according to the ramp-up time. So, (1100/60)~ 18 users will be active in every second for the first minute of your test. Each thread/user will execute the requests or samplers you have defined in your test plan hierarchy. As you have defined the loop count to infinite, each thread will execute the requests repeatedly until the test finishes. After 60 seconds, all of your 1100 users will be actively hitting those samplers/requests for the remaining 4 mins.
So the total number of requests you will be able to make through JMeter depends on your application response time.
If the avg response time of your requests is 1 second (assuming you have only 1 requests in your test plan), then you will be able to hit total 264000 (264000/240 = 1100 requests per second) for the last 4 mins (when all of your 1100 users are active) of your tests. You can also verify this accordingly by using Active Threads Over Time and Hits Per Second listeners.
So, Please double check the avg response time of your application or the requests/samplers you are using in your test plan.
If you want to control JMeter's throughput to 1100 per minute, you can use a Constant Throughput Timer at your test plan level and use target throughput value as 1100.
Do not forget to add the count of ramp-down time in your test duration. Yes, when you ramp up i.e. in the first minute generally you get more requests as threads are starting. In your case, your test duration should be 7 mins (60 seconds for the ramp-up 1100 users + 300 seconds for 5500 requests + 60 seconds for the ramp down for 1100 users).
You can also check this thread for more : How should I calculate Ramp-up time in Jmeter.
Please note- The total number of requests is related to throughput, Whereas the number of active threads performing the same activity is related to concurrency.
I am trying to send 1100 requests per minutes to my API endpoint for a period of 5 minutes, so in total I will make 5500 requests to the endpoint.
I don't know how you came with this 5500 number but this is not very correct.
Your setup means that:
JMeter will add 18 virtual users each second for 60 seconds
After 60 seconds pass JMeter will run 1100 users for another 4 minutes
The total number of requests JMeter will be able to make will mostly depend on application response time.
If you want to limit JMeter's throughput to 1100 requests per minute consider using Constant Throughput Timer or Precise Throughput Timer
If you don't want to limit JMeter's throughput but want 5500 executions either:
Set "Loop Count" to 5 (but in that case you might fail to get 1100 concurrent users)
Or use Throughput Controller in Total Executions mode so JMeter would stop after executing 5500 requests
I have a problem with JMeter that I can't figure out.
I have 3 requests in one thread group. Each request needs to be executed 5000 times in 5 minutes which means I need to execute 15 000 requests in 5 minutes altogether.
The thread group is set up like this:
Number of threads (users): 50
Ramp-up period: 1
Loop count: forever
Duration (seconds): 300
Each request has a Constant throughput Timer:
Target throughput: 1000.0
Calculate Throughput based on: all active threads in current thread group
And the results after the test run is complete are around 2000-3000 requests and that is too low. I can't figure out which settings are wrong.
Tests are ran in non-GUI mode on an Azure virtual machine with a Intel Xeon E5-2673 #2.3 GHz with 16 cores and 32gb of RAM and the server is more than capable of executing more requests since the response time is about 1 second so hardware should not pose a problem. JMeter heap memory is set to 12 GB.
Any help is appreciated!
I have 3 requests in one thread group. Each request needs to be executed 5000 times in 5 minutes which means I need to execute 15 000 requests in 5 minutes altogether.
That means you have to execute thread group for 5000 times in 5 mins => 300 seconds. If you execute thread group that much of time, you will automatically generate 15k requests.
From Documentation:-
Loop Count Number of times to perform the test case. Alternatively, "forever" can be selected causing the test to run until manually stopped.
When you set loop count: forever or any value in loop count for that matter, it means you want next set of users(threads) [which you have defined as 50 now], only when you are done with the first set 50 users request (150 requests as each thread group as 3 requests). Now, this 50 users request may take unexpected time and your next set will be returned only after this 50 users are done.
So to solve the problem at hand, you should have the following configuration for the thread group :
Number of threads (users): 5000
Ramp-up period: 300
Loop count: 1
So this means after every second around 17 Threads would be on-boarded.
To achieve your desired value configure the following
Number of threads (users): 50 / 60
Ramp-up period: 30
Loop count: forever
Duration (seconds): 300
It is good practice to give some ramp up time.
Also Constant Throughput Timer works on minute level and your desired throughput should be
Target throughput (in minutes): 3000.0
Calculate Throughput based on: all active threads in current thread group
So now, in 1 minute, JMeter will try to send 3000 requests and in 5 minutes, request count will be more or less around 15000.
Here are a few recommendations to tackle tests like this:
Use Ultimate Thread Group to create the threads required to run your tests.
Increase the total number of threads to 150-200 - Depending on the response time of your requests, 50 threads may be busy and you are not able to scale beyond certain throughput.
Add throughput shaping timer under Ultimate thread group, to maintain the throughput of 50RPS for 5 minutes(300 Seconds).
The combination of Ultimate Thread Group and Throughput Shaping Timer will allow you to have granular control over your requests and RPS you want to achieve.
Set Ulitmate Thread Group and Throughput Shaping Timer as below.
Put all your requests below Throughput Shaping Timer and you should be able to achieve the expected load.
Try to use Stepping thread group. It will allow you to send 50 user per second upto 300 second.
Download jar from below link.
https://jmeter-plugins.org/wiki/SteppingThreadGroup/