• Jason House <jason.james.house gmail.com> Feb 14 2009

Jason House <jason.james.house gmail.com> writes:

Walter Bright Wrote:

 Andrei Alexandrescu wrote:
 2. The global random generator will be allocated per thread. Are you 
 cool with this too?


 That could have speed problems with a tight loop accessing thread local 
 storage. If it's a shared global with no locking, the thread randomness 
 will increase its randomness <g>.



Lately, I wonder why TLS is treated as special and globals are normal. I don't
know enough about threading models on various platforms to fully understand the
implications. I've already been tempted to move some of my multi-threaded D
code to multi-process for the benefits it offers (mostly efficient garbage
collection when scaling to 8+ threads. My use of shared memory is minimal and
easily eliminated. 


 
 3. How should the global rng be initialized? To always generate the same 
 sequence, or not?


 Always different, because that's what I want if I just want a freakin' 
 random number!