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
Contents
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.
2. Types of thread profiling
Scheduled profiling:
By default, APM Insight schedules thread profiling twice a day for a period of 5 minutes.
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 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
- When your 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.
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.
Here's a quick video of how thread profiling works: