Lock Performance

[twood02]

Write a program that measures the performance cost of using locks. Measure the overhead of calling lock and unlock depending on the level of contention (i.e., the number of threads) in the system. You will need a finer grained timing system than gettimeofday.

[wenhuizhang]

Prof. do you mind if assign this issue to us ?
@huyang1988 @pradeep-k @wenhuizhang

[wenhuizhang]

Prof. Tim, it is interesting that the time overhead per thread changes with the num_threads, yet the time is counting only the overhead of calling mutex, which should be about the same regardless of num_threads, do you mind if explain why this happened ? and the same thing happened to output of issue #48 as well.

[wenhuizhang]

Just updated, pls check out