How can I increment a counter every N loops in JMeter?

Posted by Dave Hunt on Stack Overflow See other posts from Stack Overflow or by Dave Hunt
Published on 2010-07-13T14:35:07Z Indexed on 2012/09/28 9:38 UTC
Read the original article Hit count: 272

Filed under:

concurrency

|

loops

|

jmeter

|

increment

I want to test concurrency, and reliably replicate an issue that JMeter brought to my attention.

What I want to do is set a unique identifier (currently the time in milliseconds with a counter appended) and increment the counter between loops but not between threads. The idea being that the number of threads I have set up is the number of identical identifiers before incrementing and using another.

If I had 3 threads with a loop count of 2 I want:

1. Unique ID: <current-time-in-millis>000000
2. Unique ID: <current-time-in-millis>000000
3. Unique ID: <current-time-in-millis>000000
4. Unique ID: <current-time-in-millis>000001
5. Unique ID: <current-time-in-millis>000001
6. Unique ID: <current-time-in-millis>000001

I've tried using Throughput Controllers to increment a counter, as well as several other things that seemed they should work but had no luck. This seems like something JMeter should be able to do. Is there any way to get the value of the loop count?

© Stack Overflow or respective owner

Related posts about concurrency

SQL SERVER – Concurrency Basics – Guest Post by Vinod Kumar

as seen on SQL Authority - Search for 'SQL Authority'
This guest post is by Vinod Kumar. Vinod Kumar has worked with SQL Server extensively since joining the industry over a decade ago. Working on various versions from SQL Server 7.0, Oracle 7.3 and other database technologies – he now works with the Microsoft Technology Center (MTC) as a Technology… >>> More
Http requests / concurrency?

as seen on Stack Overflow - Search for 'Stack Overflow'
Say a website on my localhost takes about 3 seconds to do each request. This is fine, and as expected (as it is doing some fancy networking behind the scenes). However, if i open the same url in tabs (in firefox), then reload them all at the same time, it appears to load each page sequentially rather… >>> More
Mnesia: A Distributed DBMS Rooted in Concurrency

as seen on Internet.com - Search for 'Internet.com'
Find out what makes Mnesia, the Erlang-based database management system, perfect for distribution across a network of computers. >>> More
C# concurrency vs Java concurrency, which is neatly designed? which is better?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am hard core fan for Doug Lee and his concurrency framework. I have also (from twitter) came across a comment from Joshua Bloch that java concurrency is one of the best framework (guess that he compared to .Net). But some of you worked in both Java Concurrency and .NET concurrency. What is your… >>> More
Queued Loadtest to remove Concurrency issues using Shared Data Service in OpenScript

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Queued Processing to remove Concurrency issues in Loadtest ScriptsSome scripts act on information returned by the server, e.g. act on first item in the returned list of pending tasks/actions. This may lead to concurrency issues if the virtual users simulated in a load test scenario are not synchronized… >>> More

Related posts about loops

C++ behavior of for loops vs. while loops

as seen on Stack Overflow - Search for 'Stack Overflow'
As far as I understand, when you write a for-loop similar to this one for (int i = 0; i < SOME_NUM; i++) { if (true) do_something(); else do_something_else(); } The time complexity of this operation is mostly affected by the if (true) statement because the for-loop iterations don't… >>> More
While loops within while loops and output php?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a while loop to show the replies for a post on my website. The value for parentID used in the query is $post['postID'] which is an array of details for the post being viewed. As seen below it outputs the following (each subject is a link to view the full post) $q = $dbc -> prepare("SELECT… >>> More
Loops inside loops

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'd like to find easier way to write loops inside loops. Here is example code of 3 levels of 'for' loops: int level = 0; int value = 0; bool next = false; for (int i0 = 0; i0 < 6; i0++) { level = 0; value = i0; method(); if (next) for (int i1 = 0; i1 < 6; i1++) … >>> More
Mulitple full joins in Postgres is slow

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a program to use the IMDB database and am having very slow performance on my query. It appears that it doesn't use my where condition until after it materializes everything. I looked around for hints to use but nothing seems to work. Here is my query: SELECT * FROM name as n1 FULL JOIN… >>> More
PL/SQL Practices - "On Cursor FOR Loops"

as seen on Oracle Technology Network - Search for 'Oracle Technology Network'
It's important to know when not to use cursor FOR loops. >>> More