Performance measurements of programs, functions and modules - which handbooks can you read?

Question

Java

Good afternoon.
Please tell me what books/articles you can read about measuring the performance of programs and modules. Interested in both generally accepted measurement practices and methods for determining the effectiveness of measurements.
I will also be grateful for the concretization in Java.
Thank you.

Answer 1

Productivity - the number of operations performed per unit of time. Take your program, and calculate how long it takes to do the operation x times (x must be large for measurement accuracy), then divide one number by another.
For starters, you can read the article: habrahabr.ru/post/143468/

Answer 2

You can read this book: Java Performance, Charlie Hunt, Binu John