JMeter - 350 Concurrent Users load testing fails due to “Timeout performing EVAL” and 500 INTERNAL SERVAR ISSUE

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I'm performing load test in my application which is registration application for schools. So I'm performing load test for the registration scenario and when I perform load test with JMeter for 350 concurrent users using Thread group with 1 ramp up secs , I'm facing the below issue's ,

  1. Timeout performing EVAL

  2. 500 - The request timed out.

  3. 502 - Internal server error.

Can any one suggest on this whether it is issue from JMeter tool or the issues is from the application side.

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jmeter

1 Answers

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Normally HTTP Status Codes 500 and above indicate server-side error so most probably your application under test is not capable of handling 350 concurrent users, so basically you've found the bottleneck.

Next actions would be identifying

  1. So called saturation point - the maximum number of users which your application can support before performance starts degrading (response time increases and throughput decreases)
  2. Breaking point - you can state that 350 users are not supported, however I don't think you have information how many are really supported before the application starts throwing errors

  3. The cause of the bottleneck which might be in:

    • incorrect configuration of the application and middleware - can be checked by manual inspection of configuration files and logs
    • lack of resources (i.e. CPU, RAM, Swap, Disk, Network, etc.) - can be checked using i.e. JMeter PerfMon Plugin
    • error in the application (inefficient algorithm, large objects, not closed handles, etc.) - can be checked using profiler tools