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POhttp load generator in java
 

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    <p>This is more of design question; how would you design a http load generator in java for which you can specify number of concurrent users, the amount of time to run the test, and a list of urls to hit. </p> <pre><code>some_load_generator -users n1 -time n2 -urls some_file_name.txt </code></pre> <p>The program starts up, creates number of threads as specified by number of users, every thread reads a random url from the url file and makes a GET request. For every request, each thread records the time it took to complete the entire GET request. Every 5 seconds this program prints out the minimum, maximum, and the average time across all the requests made so far by all the threads. </p> <p>How would you go about creating threads, storing the min, max, and average information and printing that information every 5 seconds.</p> <p>Here is what I have thought so far:</p> <ol> <li><p>The program will create a new fixed thread pool executor which corresponds to the number of users. This takes of threads life cycle management.</p></li> <li><p>The Runnable implementation reads a line from the file makes a GET request and records the time it took.</p></li> <li><p><strong>My main issue</strong> is how to calculate min, max, and average, across all threads, efficiently since we will need to synchronize access to these variables.</p></li> <li><p>For printing the statistics every 5 seconds, I will use a timer task that wakes up, displays the statistics and goes back to sleep. The main issue here is, how to efficiently schedule the timer task, since there are a lot of threads that are trying to update the state of the statistics while this thread is trying to print it. May be I can increase the priority of this thread as compared to others so it gets preference while execution.</p></li> </ol>
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    1. USuser824212
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    1. COhave a look at Jmeter
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