What causes false sharing in multi-threaded applications?

What causes false sharing in multi-threaded applications?

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 two different variables that are located on the same cache line, they can interfere with each other's cache, causing delays.

How can I avoid false sharing in my code?

You can avoid false sharing by ensuring that frequently accessed variables are placed in separate cache lines, often by padding them.