magento-test/lib/internal/Magento/Framework/Profiler

A library for profiling source code. This is a manual type of profiler, when programmer adds profiling instructions explicitly inline to the source code.

Features:

• Measures time between tags (events), number of calls and calculates average time
• Measures memory usage
• Allows nesting of events and enforces its integrity, and measures aggregated stats of nested elements
• Allows configuring filters for tags
• Provides various output formats out of the box: direct HTML output and CSV-file