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“A profiler is a tool that is used to analyze the performance of a program or application, typically by measuring its execution time, memory usage, and other metrics. Profilers are used to identify bottlenecks and inefficiencies in a program, allowing developers to optimize its performance and improve its speed and reliability.

Profilers typically work by instrumenting the code of a program, inserting additional instructions that collect information about the program’s execution and performance. This information can be used to generate reports and visualizations that highlight areas of the program where performance can be improved.

Profiling can be done at different levels of granularity, from analyzing the performance of individual functions or methods, to analyzing the overall performance of an entire application. Profilers are an essential tool for performance optimization and are widely used in software development and other fields where performance is critical.”

GNU Profiler (gprof) Java Virtual Machine (JVM) profiler Visual Studio profiler Xcode Instruments profiler perf profiler Valgrind profiler