Help APM Thread Profiling

Thread Profiling

Thread profiling enables you to identify and isolate bottlenecks in your code stack. In Site24x7 APM Insight, all thread profiles collected in the chosen time window are listed, along with the thread count, CPU time and memory details. Each thread profile consists of a list of threads that were running when the application was being profiled. 

Upon clicking a specific thread profile, one can view:

  • High CPU consuming threads,along with its thread ID, CPU time and memory allocated details
  • Time consuming methods which could potentially affect application's performance
  • Invocation count of every method


  1. View thread profiling
  2. Types of thread profiling

1. To View thread profiling:

  • Log into your Site24x7 account.
  • Go to Home > APM > your application.
  • Click on Thread Profiles tab and then on individual threads to inspect them further.
 Thread Profiling

2. Types of thread profiling

Scheduled profiling:

By default, APM Insight schedules thread profiling twice a day for a period of 5 minutes.

In Java agent, scheduled thread profiling happens for every one hour.

On-Demand profiling:

With On-Demand profiling,one can initiate thread profiling at the current time for a duration ranging from 5 to 30 minutes.

The threads are sampled at regular time interval in the specified duration and the collective data is displayed at the end of time duration.

To initiate On-Demand profiling,

  • Log into your Site24x7 account.
  • Go to Home > APM > your application.
  • Click on Thread Profiles tab and then click on On-Demand Thread Profiling tab.
  • Specify time duration and click on Initiate profiling.
On demand thread profiling
On-Demand  profiling can be initiated only once per hour ie.,if you initiate On-Demand profiling for 5 minutes, next initiation can be done only after 55 minutes. 
Specify duration for on-demand thread profiling

On-Demand profiling can be initiated for both applications and instances.

    • In application view, On-Demand profiling will be initiated for the first available instance.
    • In instance view, On-Demand profiling will be initiated only when the instance is UP.
    • When you try to initiate On-Demand profiling when the instance is Down,you will receive an alert message saying "Agent is currently DOWN.Please try after some time
On-demand thread profiling down alert
    • When your instance is suspended, On-Demand profiling will be disabled
When instance is suspended, On-Demand profiling will be disabled
 Top N resource-consuming threads

With this option, you can easily identify the threads that consume the most CPU or memory. You can choose any value (N) from five to 20.

This option is only available for Java agents v5.6 and above.

Top N resource-consuming threads

When ON-DEMAND thread profiling is requested, the agent also monitors the CPU and memory usage of each thread. The agent picks the top N threads that consumed a large amount of resources from each category (CPU and memory) based on the N value you provided. Once the profiling is finished, the threads, along with their usage statistics and stack traces, will be displayed in the Site24x7 web client.

The below figure shows the threads sorted in descending order by the amount of resources consumed.

 On demand thread profiling result


Here's a quick video of how thread profiling works:

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Help APM Thread Profiling