Changes

[[File:4threads_padding.jpg|1000px]]

The other way to eliminating false sharing is to implement a mutual exclusion construct. This the better method than using padding as there is no wasting of memory and data access is not hindered due to cache line invalidation. Programming a mutual exclusion implementation is done by using the critical construct in an op environment. The critical construct restricts statements to a single thread to process at a time, making variables local to a single thread ensures that multiple threads do not write data to the same cache line.

=Conclusion =

False sharing is a lurking problem that hinders the scalabilty of a program and it can be easily missed. It is very important to keep and eye out for the problem and recognize it quickly in parallel programming where performance is key. The two methods we explored, padding and thread local variable, are both reliable solution to false sharing but having a local variable to a thread is definitely better than padding as padding is more resource wasteful making it counter intuitive in parallel programming.