Using multiple processors

[thedeemon]

On Sunday, 23 December 2012 at 08:00:56 UTC, n00b wrote:
> Hello.
> My program has a great deal of computation to do, so I thought 
> I'd create several threads in order to use multiple processors. 
> It worked fine with a simple "test" program, but when I try to 
> do this with the real program, only 1 processor is used.

How much memory allocation is happening there? High allocation 
rate and often GCs can kill parallelism since they're happening 
with a lock. Anyway, too hard to tell anything certain without 
knowing what your program is doing.