Micro Benchmark Tests on "int" Operations

JVM Tutorials - Herong's Tutorial Examples

∟Micro Benchmark Tests on "int" Operations

This chapter provides tutorial notes and example codes on micro benchmark tests on 'int' data type operations. Topics include empty loop, assignment loop, shift operation, add operation, multiplication operation and division operation.

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Revised BenchmarkRunner.java

Hardware, OS and JVM Configurations

"int" Empty Loop Performance: 8 Nanoseconds / Step

"int" Assignment Only: 10 Nanoseconds per Step

"int" Shift and Assignment: 13 Nanoseconds per Step

"int" Add and Assignment: 12 Nanoseconds per Step

"int" Multiply and Assignment: 12 Nanoseconds per Step

"int" Division and Assignment: 12 Nanoseconds per Step

Comparison of Int Loops between Windows 7 and XP

Takeaways:

An "int" empty loop runs 8 nanoseconds per step in interpreted-only mode.
An "int" assignment loop of x=i runs 10 nanoseconds per step in interpreted-only mode.
An "int" shift and assignment loop of x=i<<1 runs 13 nanoseconds per step in interpreted-only mode.
An "int" add and assignment loop of x=i+i runs 12 nanoseconds per step in interpreted-only mode.
An "int" multiplication and assignment loop of x=i*3 runs 12 nanoseconds per step in interpreted-only mode.
An "int" division and assignment loop of x=i/3 runs 13 nanoseconds per step in interpreted-only mode.
Above results were collected on my Windows 7 computer with Intel Core i5-6200U CPU @ 2.30Ghz with 4.00 GB of RAM.