What is false sharing in computer science?

What is false sharing in computer science?

False sharing occurs when threads on different processors modify variables that reside on the same cache line, leading to performance degradation.

How does false sharing affect performance?

It can significantly slow down performance because it causes unnecessary cache coherence traffic, making threads wait for each other.

Can you give an example of false sharing?

Sure! If two threads modify different variables that are close together in memory, they might end up on the same cache line, causing false sharing.

How can I avoid false sharing in my code?

You can avoid false sharing by padding your data structures to ensure that frequently accessed variables are on separate cache lines.