an extremely naive question regarding synchronized...

[Steven Schveighoffer via Digitalmars-d-learn]

On 11/15/16 3:05 PM, Kapps wrote:

>
> Keep in mind, this is only slow for such a large amount of calls.
> If you're calling this only a hundred times a second, then who cares if
> it's slower. After all, with GDC we were looking at 1 billion calls in
> 21 seconds. That's 47,000 calls per *millisecond*.

This is the wrong way to look at it.

If you are calling it from one thread, then 100 times/second is no 
problem. If you have 100 threads calling it 100 times a second, you have 
killed any performance gained by using threads in the first place.

The reason lock-free singletons are so attractive is because of the 
allowance of multiple threads to use it at the same time without 
contention. It's why years of "slightly wrong" advice on singletons has 
been out there, and why this solution is so amazing in its simplicity.

-Steve