Why doesn't my threaded .Net app scale linearly when allocating large amounts of memory?

Question

I’ve run into something strange about the effect of large memory allocations on the scalability of the .Net runtime. In my test application I create lots of strings in a tig

Answer 1

You may want to look that this question of mine.

I ran into a similar problem that was due to the fact that the CLR performs inter-thread synchronization when allocating memory to avoid overlapping allocations. Now, with the server GC, the locking algorithm may be different - but something along those same lines may be affecting your code.