StrongLoop Arc and slc are no longer under active development, and will soon be deprecated. Arc's features are being included in the IBM API Connect Developer Toolkit: Please use it instead.
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Profiling means generating CPU profiles and heap memory snapshots for an application.  These can help detect memory leaks and other run-time issues.

StrongLoop tools enable you to profile both local and remote Node applications.  You can:

Using the StrongLoop profiler demo app

The StrongLoop profiler demo app is a simple LoopBack application that showcases CPU and heap profiling.  

The demo app includes a load generator script that makes two POST requests:

  • POST /documents - creates multiple instances of the document object and burns CPU. Use the CPU profiler to see the CPU usage.
  • POST /documents/content - increases the Document count. Use the heap profiler to see the increased object count.

Install demo app

Install the profiler demo app from GitHub:

Perform monitoring

Run the app:

Then display the application status to ensure that the application is running:

You should see something like this:

Now, run the load generator script:

You can collect CPU and heap profiling data using the slc ctl commands and Google Chrome tools.

For example, to profile CPU consumption for worker process number one (1):

Then, after a few seconds, stop CPU profiling:

To profile heap memory consumption:

See slc ctl for more details.

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