Does it make sense to spawn more than one thread per processor?

Question

From a logical point of view an application may need dozens or hundreds of threads, some of which will we sleeping most of the time, but a very few will be always running co

Answer 1

Other have talked about situations in which it almost certainly does make sense (when you are doing any kind of slow IO).

It might not be a good idea if:

• your threads are doing CPU bound work

and

• the threads each want to use a lot (i.e. significant compared to the cache size) of memory that does not overlap

In this case there is the possibility of causing unnecessary cache misses.