Feather

A featherlight on-the-fly false-sharing detection tool

The microbenchmark directory contains test cases that exercise different types of false sharing.

To build and test:

1. Set the false sharing detection tool in the FALSESHARING_HARNESS variable under microbenchmark/Makefile

2. cd microbenchmark

3. make

4. make check

Each test case is self-explanatory.

Test1.cpp: Basic write-write false sharing test.

Test2.cpp: Basic no false sharing test.

Test3.cpp: Basic read-write false sharing test.

Test4.cpp: Seperating read-write from write-read false sharing.

Test5.cpp: Array not involved in any false sharing.

Test6.cpp: Multiple variables each with different false sharing severity.

Test7.cpp: True sharing but no false sharing.

Test8.cpp: Complex permutation of source lines involved in false sharing with multiple other source locations.

Test9.cpp: Insignificant amount of false sharing due to barriers creating phases in the program.

Test10.cpp: Inter-process false sharing.